Predicting Subjects From Articles Supervised

Written and developed by Eric Detjen

This repository contains a machine-learning model that classifies articles into different subjects. The model uses article meta-data sourced from arXiv's condensed matter physics articles(http://www.arxiv.org/). The project leverages a variety of techniques, including TF-IDF for text feature extraction, date feature extraction, and Random Forest Classifier for model training. Experiment logging and tracking are handled using the Capital One open-source framework, Rubicon-ML.

For ease of viewing, I have included the model.ipynb file in the README here. If desired, this and all other files are available in this repo.

#imports
from sklearn.feature_extraction.text import TfidfVectorizer
from sklearn.preprocessing import LabelEncoder
from scipy.sparse import hstack
from sklearn.ensemble import RandomForestClassifier
from collections import defaultdict
from joblib import dump
import pandas as pd
from IPython.display import display
from rubicon_ml import Rubicon
from datetime import datetime
import json
from colorama import Fore, Style
from dateutil.relativedelta import relativedelta
import csv
from sklearn.model_selection import train_test_split
from sklearn.metrics import accuracy_score, confusion_matrix, classification_report

Initialize Rubicon and Project

We initialize Rubicon for logging and create a project for Article Classification.

rubicon = Rubicon(persistence="filesystem", root_dir="./rubicon-root")
project = rubicon.get_or_create_project("Article Classification")

# Log the experiment
experiment = project.log_experiment(
    model_name="Random Forest",
    tags=["text classification", "NLP"]
)

Read and Adjust Data

Read the data

we will test the accuracy by comparing using 80% of the train data to train and then for the last 20% removing the subjects and comparing the models results on that against the true subject data for the same 20%

with open("train.json", "r") as file:
    data = json.load(file)

with open("test.json", "r") as file:
    final_test_data = json.load(file)

# Split the data into 80% for training and 20% for testing
train_data, test_data = train_test_split(data, test_size=0.2, random_state=42)

Feature Extraction

We extract features using TF-IDF for article abstracts and titles and also extract date features.

The TF-IDF is key here since it will yield a higher rating for words that are frequent in the specific text it is analyzing yet rare across all documents. This allows the model to focus on the words that are important and not common words like “and” or “the”.

max_features_abstract = 1000
stop_words = 'english'
max_features_title = 500
# Extracting month and year from the date for both train and test data
def extract_date_features(data):
    months = []
    years = []
    for article in data:
        article_date = datetime.strptime(article['date'], '%Y-%m-%dT%H:%M:%S.%fZ')
        months.append(article_date.month)
        years.append(article_date.year)
    return months, years


# Initialize the vectorizers and the label encoder
vectorizer_abstract = TfidfVectorizer(max_features= max_features_abstract, stop_words='english')
vectorizer_title = TfidfVectorizer(max_features= max_features_title, stop_words='english')
label_encoder = LabelEncoder()

# Extract date features for train and test data
train_months, train_years = extract_date_features(train_data)
test_months, test_years = extract_date_features(test_data)

# Using TF-IDF for abstract and title feature extraction for train and test data
train_abstract_features = vectorizer_abstract.fit_transform([article['abstract'] for article in train_data])
train_title_features = vectorizer_title.fit_transform([article['title'] for article in train_data])

test_abstract_features = vectorizer_abstract.transform([article['abstract'] for article in test_data])
test_title_features = vectorizer_title.transform([article['title'] for article in test_data])

Data Preparation

I now combine all the extracted features using hstack and encode the labels using label_encoder.

# Combining all features
X_train = hstack([train_abstract_features, train_title_features, [[month, year] for month, year in zip(train_months, train_years)]])
X_test = hstack([test_abstract_features, test_title_features, [[month, year] for month, year in zip(test_months, test_years)]])

# Encoding the target variable 
y_train = label_encoder.fit_transform([article['subject'] for article in train_data])
y_test = label_encoder.transform([article['subject'] for article in test_data])

Model Training

I initialize and train the Random Forest Classifier.

I chose to use the random forest classifier because it is a very robust model for supervised learning that is not prone to overfitting and is very good at handling the highly dimensional categorical data that we have. It is also is very interpretable which allows us to log meaningful metrics and parameters to Rubicon.

# Initializing and training the Random Forest classifier
n_estimators=200
random_state=92
verbose=1 
n_jobs=-1
rf_classifier = RandomForestClassifier(n_estimators = n_estimators, random_state = random_state, verbose = verbose, n_jobs = n_jobs)
rf_classifier.fit(X_train, y_train)

[Parallel(n_jobs=-1)]: Using backend ThreadingBackend with 10 concurrent workers.
[Parallel(n_jobs=-1)]: Done  30 tasks      | elapsed:   24.4s
[Parallel(n_jobs=-1)]: Done 180 tasks      | elapsed:  1.9min
[Parallel(n_jobs=-1)]: Done 200 out of 200 | elapsed:  2.1min finished
[Parallel(n_jobs=10)]: Using backend ThreadingBackend with 10 concurrent workers.
[Parallel(n_jobs=10)]: Done  30 tasks      | elapsed:    0.3s
[Parallel(n_jobs=10)]: Done 180 tasks      | elapsed:    1.6s
[Parallel(n_jobs=10)]: Done 200 out of 200 | elapsed:    1.8s finished

Logging

Using the Capital One Rubicon system to log our important parameters

experiment = project.log_experiment(
    model_name="Random Forest",
    tags=["text classification", "NLP"]
)

# Log parameters dynamically from the trained RandomForestClassifier object
parameters_to_log = [
    "n_estimators", "max_depth", "min_samples_split", "min_samples_leaf",
    "min_weight_fraction_leaf", "max_features", "max_leaf_nodes", 
    "min_impurity_decrease", "min_impurity_split", "bootstrap", 
    "oob_score", "n_jobs", "random_state", "verbose", "warm_start"
]

for param_name in parameters_to_log:
    param_value = getattr(rf_classifier, param_name, "Not set")
    experiment.log_parameter(name=param_name, value=param_value)

Saving

I use the joblib dump to save the model so it does not have to be trained repeatedly. This file was over the GitHub size limits so it is unfortunately not in the repo. The model only takes about 6 minutes to train locally though.

model_path = "random_forest_model.joblib"
dump(rf_classifier, model_path)

Model Evaluation

here we evaluate the performance of the test data set.

Again, we test the accuracy by comparing using 80% of the train data to train and then for the last 20% removing the subjects and comparing the model results on that against the true subject data for the same 20%

#predicting the test data
y_pred = rf_classifier.predict(X_test)

accuracy = accuracy_score(y_test, y_pred)
model_path, accuracy

experiment.log_metric(name="Accuracy_Score_5", value=accuracy)  

# Optionally, log additional text or configurations
#experiment.log_parameter(name="TF-IDF Max Features", value=f"{max_features_abstract} for abstract, {max_features_title} for title")

[Parallel(n_jobs=10)]: Using backend ThreadingBackend with 10 concurrent workers.
[Parallel(n_jobs=10)]: Done  30 tasks      | elapsed:    0.3s
[Parallel(n_jobs=10)]: Done 180 tasks      | elapsed:    1.4s
[Parallel(n_jobs=10)]: Done 200 out of 200 | elapsed:    1.5s finished





<rubicon_ml.client.metric.Metric at 0x2ae3b4280>

Results Summary

I display the results from the tests here. It shows which subjects it messes up on most and for each of those, which subjects it mistakenly labels it as.
This is key for giving meaningful insight into what is causing the confusion.

decoded_predictions = label_encoder.inverse_transform(y_pred)

# Extract the actual labels from the test data
actual_labels = [article['subject'] for article in test_data]

# Compare the predicted labels to the actual labels
results_comparison = list(zip(actual_labels, decoded_predictions))

# Initialize dictionaries to keep track of all predictions and incorrect predictions for each unique "Actual" value.
total_predictions = defaultdict(int)
incorrect_predictions = defaultdict(lambda: defaultdict(int))

df_rows = []

# Populate the dictionaries with data.
for actual, predicted in results_comparison:
    total_predictions[actual] += 1
    if actual != predicted:
        incorrect_predictions[actual][predicted] += 1

# Add rows to the DataFrame list.
for actual, predicted_dict in incorrect_predictions.items():
    total = total_predictions[actual]
    correct = total - sum(predicted_dict.values())
    correct_percentage = (correct / total) * 100

    first_row = True
    for predicted, count in predicted_dict.items():
        if first_row:
            df_rows.append({
                'Actual': actual,
                'Predicted': predicted,
                'Count': count,
                'Correct Percentage': f"{correct_percentage:.2f}%",
                'Total Articles': total
            })
            first_row = False
        else:
            df_rows.append({
                'Actual': '',
                'Predicted': predicted,
                'Count': count,
                'Correct Percentage': '',
                'Total Articles': ''
            })

    # Add a separator row
    df_rows.append({
        'Actual': '',
        'Predicted': '',
        'Count': '',
        'Correct Percentage': '',
        'Total Articles': ''
    })
pd.set_option('display.max_rows', None)

# Create a DataFrame from the list of rows.
df = pd.DataFrame(df_rows)

# Display the DataFrame.
display(df)

Accuracy:

	Actual	Predicted	Count	Correct Percentage	Total Articles
0	quantum physics	mesoscale and nanoscale physics	193	32.22%	841
1		quantum gases	67
2		materials science	30
3		superconductivity	30
4		disordered systems and neural networks	4
5		statistical mechanics	138
6		strongly correlated electrons	84
7		other condensed matter	14
8		soft condensed matter	6
9		condensed matter	4
10
11	disordered systems and neural networks	statistical mechanics	682	23.60%	1449
12		superconductivity	19
13		mesoscale and nanoscale physics	112
14		materials science	103
15		strongly correlated electrons	91
16		soft condensed matter	68
17		quantum gases	9
18		quantum physics	5
19		high energy physics - theory	1
20		condensed matter	9
21		physics - physics and society	1
22		other condensed matter	7
23
24	mesoscale and nanoscale physics	superconductivity	231	74.87%	5527
25		materials science	579
26		other condensed matter	20
27		statistical mechanics	190
28		strongly correlated electrons	220
29		quantum gases	19
30		soft condensed matter	29
31		quantum physics	50
32		condensed matter	34
33		disordered systems and neural networks	16
34		high energy physics - theory	1
35
36	other condensed matter	mesoscale and nanoscale physics	198	20.72%	1144
37		statistical mechanics	205
38		strongly correlated electrons	118
39		quantum gases	72
40		materials science	238
41		superconductivity	28
42		quantum physics	12
43		condensed matter	2
44		soft condensed matter	28
45		disordered systems and neural networks	4
46		high energy physics - theory	1
47		physics - chemical physics	1
48
49	soft condensed matter	materials science	217	60.15%	2454
50		statistical mechanics	549
51		other condensed matter	50
52		strongly correlated electrons	30
53		mesoscale and nanoscale physics	43
54		condensed matter	44
55		physics - biological physics	1
56		superconductivity	15
57		disordered systems and neural networks	16
58		quantum gases	13
59
60	superconductivity	mesoscale and nanoscale physics	105	84.85%	3643
61		statistical mechanics	43
62		strongly correlated electrons	246
63		condensed matter	20
64		quantum gases	21
65		materials science	74
66		quantum physics	10
67		other condensed matter	25
68		high energy physics - theory	1
69		soft condensed matter	6
70		disordered systems and neural networks	1
71
72	materials science	statistical mechanics	244	65.53%	4549
73		mesoscale and nanoscale physics	713
74		soft condensed matter	150
75		strongly correlated electrons	322
76		condensed matter	31
77		physics - chemical physics	1
78		superconductivity	76
79		disordered systems and neural networks	15
80		quantum physics	8
81		nuclear theory	1
82		other condensed matter	4
83		quantum gases	1
84		physics - optics	1
85		high energy physics - theory	1
86
87	strongly correlated electrons	mesoscale and nanoscale physics	508	69.34%	4883
88		materials science	370
89		superconductivity	373
90		statistical mechanics	153
91		condensed matter	25
92		other condensed matter	10
93		quantum gases	26
94		disordered systems and neural networks	8
95		quantum physics	11
96		soft condensed matter	10
97		high energy physics - theory	3
98
99	statistical mechanics	condensed matter	84	74.64%	4870
100		strongly correlated electrons	284
101		quantum physics	61
102		soft condensed matter	306
103		superconductivity	55
104		materials science	122
105		other condensed matter	64
106		disordered systems and neural networks	93
107		mesoscale and nanoscale physics	124
108		quantum gases	37
109		physics - physics and society	2
110		mathematical physics	1
111		high energy physics - theory	2
112
113	condensed matter	materials science	152	54.36%	2360
114		strongly correlated electrons	194
115		mesoscale and nanoscale physics	159
116		statistical mechanics	393
117		superconductivity	64
118		soft condensed matter	66
119		disordered systems and neural networks	19
120		other condensed matter	18
121		quantum gases	8
122		high energy physics - theory	2
123		quantum physics	2
124
125	quantum gases	strongly correlated electrons	113	67.97%	946
126		statistical mechanics	63
127		other condensed matter	8
128		mesoscale and nanoscale physics	56
129		materials science	21
130		condensed matter	1
131		superconductivity	18
132		quantum physics	14
133		disordered systems and neural networks	5
134		high energy physics - theory	1
135		soft condensed matter	3
136
137	physics - atomic physics	quantum gases	17	1.28%	78
138		mesoscale and nanoscale physics	9
139		other condensed matter	7
140		superconductivity	1
141		statistical mechanics	9
142		strongly correlated electrons	5
143		quantum physics	3
144		condensed matter	4
145		materials science	21
146		soft condensed matter	1
147
148	high energy physics - theory	mesoscale and nanoscale physics	53	13.07%	589
149		condensed matter	102
150		strongly correlated electrons	72
151		superconductivity	36
152		statistical mechanics	215
153		soft condensed matter	8
154		materials science	11
155		disordered systems and neural networks	2
156		quantum physics	4
157		quantum gases	7
158		other condensed matter	2
159
160	high energy physics - phenomenology	condensed matter	17	0.72%	138
161		statistical mechanics	49
162		mesoscale and nanoscale physics	15
163		superconductivity	25
164		high energy physics - theory	3
165		strongly correlated electrons	11
166		quantum physics	2
167		disordered systems and neural networks	2
168		materials science	7
169		soft condensed matter	4
170		quantum gases	1
171		other condensed matter	1
172
173	physics - computational physics	statistical mechanics	30	0.00%	83
174		materials science	26
175		soft condensed matter	16
176		strongly correlated electrons	3
177		mesoscale and nanoscale physics	7
178		quantum physics	1
179
180	physics - fluid dynamics	soft condensed matter	51	0.00%	91
181		statistical mechanics	30
182		disordered systems and neural networks	1
183		materials science	4
184		mesoscale and nanoscale physics	2
185		superconductivity	2
186		high energy physics - theory	1
187
188	mathematics - probability	statistical mechanics	57	0.00%	63
189		disordered systems and neural networks	5
190		quantum physics	1
191
192	physics - chemical physics	strongly correlated electrons	7	0.00%	140
193		statistical mechanics	29
194		materials science	62
195		soft condensed matter	19
196		condensed matter	5
197		mesoscale and nanoscale physics	17
198		high energy physics - theory	1
199
200	physics - physics and society	statistical mechanics	125	9.49%	158
201		materials science	4
202		disordered systems and neural networks	13
203		soft condensed matter	1
204
205	nonlinear sciences - chaotic dynamics	statistical mechanics	117	1.10%	182
206		soft condensed matter	5
207		disordered systems and neural networks	8
208		mesoscale and nanoscale physics	16
209		strongly correlated electrons	3
210		condensed matter	22
211		quantum physics	5
212		other condensed matter	2
213		materials science	2
214
215	nonlinear sciences - pattern formation and sol...	materials science	12	0.00%	74
216		superconductivity	6
217		statistical mechanics	24
218		quantum gases	13
219		strongly correlated electrons	2
220		other condensed matter	3
221		soft condensed matter	7
222		condensed matter	4
223		high energy physics - theory	1
224		mesoscale and nanoscale physics	2
225
226	physics - biological physics	soft condensed matter	48	0.72%	139
227		statistical mechanics	61
228		materials science	18
229		mesoscale and nanoscale physics	7
230		disordered systems and neural networks	4
231
232	nonlinear sciences - adaptation and self-organ...	disordered systems and neural networks	7	0.00%	58
233		statistical mechanics	39
234		condensed matter	8
235		materials science	2
236		physics - physics and society	1
237		strongly correlated electrons	1
238
239	physics - optics	soft condensed matter	8	0.00%	154
240		mesoscale and nanoscale physics	49
241		materials science	74
242		statistical mechanics	11
243		quantum gases	2
244		quantum physics	2
245		strongly correlated electrons	2
246		other condensed matter	1
247		superconductivity	3
248		disordered systems and neural networks	1
249		condensed matter	1
250
251	general relativity and quantum cosmology	materials science	2	1.64%	61
252		strongly correlated electrons	3
253		quantum gases	5
254		statistical mechanics	23
255		mesoscale and nanoscale physics	6
256		soft condensed matter	9
257		quantum physics	6
258		other condensed matter	2
259		condensed matter	1
260		superconductivity	1
261		high energy physics - theory	2
262
263	quantitative biology - populations and evolution	statistical mechanics	57	0.00%	67
264		disordered systems and neural networks	2
265		soft condensed matter	4
266		materials science	2
267		physics - physics and society	2
268
269	quantitative biology - biomolecules	statistical mechanics	22	0.00%	49
270		soft condensed matter	19
271		mesoscale and nanoscale physics	1
272		materials science	7
273
274	mathematical physics	statistical mechanics	169	3.06%	294
275		quantum physics	11
276		quantum gases	9
277		disordered systems and neural networks	9
278		mesoscale and nanoscale physics	23
279		strongly correlated electrons	32
280		materials science	19
281		condensed matter	2
282		soft condensed matter	4
283		other condensed matter	2
284		high energy physics - theory	2
285		superconductivity	3
286
287	nuclear theory	strongly correlated electrons	15	1.11%	90
288		statistical mechanics	37
289		quantum gases	7
290		materials science	10
291		superconductivity	9
292		mesoscale and nanoscale physics	3
293		other condensed matter	2
294		soft condensed matter	3
295		condensed matter	2
296		quantum physics	1
297
298	high energy physics - lattice	statistical mechanics	65	5.93%	118
299		condensed matter	23
300		superconductivity	3
301		quantum gases	4
302		strongly correlated electrons	9
303		mesoscale and nanoscale physics	3
304		disordered systems and neural networks	1
305		high energy physics - theory	3
306

Display the Logs

Finally we display the logs from the Rubicon system.

# Get the project

# Loop through the experiments and print details
for experiment in project.experiments():
    print(f"Experiment ID: {experiment.id}")
    print(f"Model Name: {experiment.model_name}")
    print("Parameters:")
    for param in experiment.parameters():
        print(f"  - {param.name}: {param.value}")
    print("Metrics:")
    for metric in experiment.metrics():
        print(f"  - {metric.name}: {metric.value}")
    print("------")

Experiment ID: f967a29a-0c03-4270-8a70-766802a02193
Model Name: Random Forest
Parameters:
Metrics:
------
Experiment ID: 08961d24-105a-415f-b78f-40bdc4e03a5e
Model Name: Random Forest
Parameters:
Metrics:
------
Experiment ID: 924925f4-ee26-4b89-b27e-6631c79de01d
Model Name: Random Forest
Parameters:
  - n_estimators: 200
  - max_depth: None
  - min_samples_split: 2
  - min_samples_leaf: 1
  - min_weight_fraction_leaf: 0.0
  - max_features: sqrt
  - max_leaf_nodes: None
  - min_impurity_decrease: 0.0
  - min_impurity_split: Not set
  - bootstrap: True
  - oob_score: False
  - n_jobs: -1
  - random_state: 92
  - verbose: 1
  - warm_start: False
Metrics:
  - Accuracy: 0.6119800521364616
  - Accuracy_Score: 0.6119800521364616
  - New_Accuracy_Score: 0.6119800521364616
  - Accuracy_Score_1: 0.6119800521364616
  - Accuracy_Score_2: 0.6119800521364616
------
Experiment ID: 6ed79741-4d0b-49b4-a1be-d2f7cd025851
Model Name: Random Forest
Parameters:
Metrics:
------
Experiment ID: 1a36363e-6313-4d6a-b0ab-6e818a5bdf92
Model Name: Random Forest
Parameters:
  - n_estimators: 200
  - max_depth: None
  - min_samples_split: 2
  - min_samples_leaf: 1
  - min_weight_fraction_leaf: 0.0
  - max_features: sqrt
  - max_leaf_nodes: None
  - min_impurity_decrease: 0.0
  - min_impurity_split: Not set
  - bootstrap: True
  - oob_score: False
  - n_jobs: -1
  - random_state: 92
  - verbose: 1
  - warm_start: False
Metrics:
  - Accuracy_Score_2: 0.6119800521364616
------
Experiment ID: 3b95e82b-c76a-45cb-b1c6-0d91a0728618
Model Name: Random Forest
Parameters:
  - n_estimators: 200
  - max_depth: None
  - min_samples_split: 2
  - min_samples_leaf: 1
  - min_weight_fraction_leaf: 0.0
  - max_features: sqrt
  - max_leaf_nodes: None
  - min_impurity_decrease: 0.0
  - min_impurity_split: Not set
  - bootstrap: True
  - oob_score: False
  - n_jobs: -1
  - random_state: 92
  - verbose: 1
  - warm_start: False
Metrics:
  - Accuracy_Score_2: 0.6119800521364616
------
Experiment ID: 228131f9-da73-4ffc-823f-b85ff225321c
Model Name: Random Forest
Parameters:
Metrics:
------
Experiment ID: 624c6e9e-59c3-4464-b86e-bc7d1677b39a
Model Name: Random Forest
Parameters:
Metrics:
------
Experiment ID: a6f9b5e1-f475-41b5-86fd-ed6683daa9b8
Model Name: Random Forest
Parameters:
  - n_estimators: 200
  - max_depth: None
  - min_samples_split: 2
  - min_samples_leaf: 1
  - min_weight_fraction_leaf: 0.0
  - max_features: sqrt
  - max_leaf_nodes: None
  - min_impurity_decrease: 0.0
  - min_impurity_split: Not set
  - bootstrap: True
  - oob_score: False
  - n_jobs: -1
  - random_state: 92
  - verbose: 1
  - warm_start: False
Metrics:
  - Accuracy_Score_2: 0.6119800521364616
------

defaultdict(<function __main__.<lambda>()>,
            {(2013,
              4): defaultdict(int,
                         {'mesoscale and nanoscale physics': 62,
                          'materials science': 56,
                          'superconductivity': 40,
                          'soft condensed matter': 16,
                          'strongly correlated electrons': 38,
                          'quantum physics': 5,
                          'quantum gases': 12,
                          'statistical mechanics': 41,
                          'high energy physics - theory': 1}),
             (1998,
              12): defaultdict(int,
                         {'mesoscale and nanoscale physics': 20,
                          'strongly correlated electrons': 16,
                          'statistical mechanics': 33,
                          'condensed matter': 8,
                          'soft condensed matter': 5,
                          'superconductivity': 10,
                          'materials science': 8,
                          'high energy physics - theory': 1,
                          'disordered systems and neural networks': 2}),
             (2013,
              12): defaultdict(int,
                         {'mesoscale and nanoscale physics': 56,
                          'statistical mechanics': 34,
                          'disordered systems and neural networks': 2,
                          'strongly correlated electrons': 34,
                          'soft condensed matter': 15,
                          'materials science': 53,
                          'superconductivity': 25,
                          'quantum gases': 11,
                          'quantum physics': 4,
                          'other condensed matter': 1,
                          'high energy physics - theory': 2,
                          'physics - physics and society': 1}),
             (2011,
              10): defaultdict(int,
                         {'strongly correlated electrons': 41,
                          'mesoscale and nanoscale physics': 48,
                          'soft condensed matter': 15,
                          'statistical mechanics': 35,
                          'superconductivity': 30,
                          'disordered systems and neural networks': 2,
                          'quantum physics': 4,
                          'materials science': 37,
                          'quantum gases': 17,
                          'high energy physics - theory': 1,
                          'physics - physics and society': 1}),
             (2005,
              4): defaultdict(int,
                         {'superconductivity': 20,
                          'mesoscale and nanoscale physics': 40,
                          'materials science': 30,
                          'strongly correlated electrons': 30,
                          'statistical mechanics': 42,
                          'other condensed matter': 4,
                          'disordered systems and neural networks': 7,
                          'soft condensed matter': 10,
                          'quantum physics': 1}),
             (2012,
              10): defaultdict(int,
                         {'statistical mechanics': 46,
                          'mesoscale and nanoscale physics': 55,
                          'materials science': 60,
                          'superconductivity': 31,
                          'disordered systems and neural networks': 5,
                          'strongly correlated electrons': 31,
                          'soft condensed matter': 19,
                          'quantum gases': 13,
                          'quantum physics': 7,
                          'high energy physics - theory': 1,
                          'other condensed matter': 1}),
             (2010,
              9): defaultdict(int,
                         {'superconductivity': 25,
                          'statistical mechanics': 46,
                          'soft condensed matter': 18,
                          'mesoscale and nanoscale physics': 42,
                          'quantum gases': 13,
                          'materials science': 26,
                          'quantum physics': 4,
                          'strongly correlated electrons': 26,
                          'physics - physics and society': 1,
                          'disordered systems and neural networks': 2}),
             (2012,
              1): defaultdict(int,
                         {'materials science': 40,
                          'strongly correlated electrons': 29,
                          'statistical mechanics': 36,
                          'mesoscale and nanoscale physics': 44,
                          'quantum gases': 18,
                          'mathematical physics': 1,
                          'superconductivity': 11,
                          'soft condensed matter': 17,
                          'quantum physics': 3,
                          'high energy physics - theory': 1,
                          'disordered systems and neural networks': 1}),
             (2008,
              1): defaultdict(int,
                         {'mesoscale and nanoscale physics': 41,
                          'strongly correlated electrons': 34,
                          'materials science': 22,
                          'other condensed matter': 7,
                          'superconductivity': 18,
                          'statistical mechanics': 26,
                          'soft condensed matter': 12,
                          'quantum gases': 1,
                          'quantum physics': 1,
                          'disordered systems and neural networks': 2}),
             (2003,
              5): defaultdict(int,
                         {'strongly correlated electrons': 26,
                          'soft condensed matter': 12,
                          'statistical mechanics': 61,
                          'superconductivity': 28,
                          'materials science': 21,
                          'mesoscale and nanoscale physics': 25,
                          'other condensed matter': 3,
                          'disordered systems and neural networks': 7,
                          'condensed matter': 1,
                          'quantum gases': 1,
                          'quantum physics': 1}),
             (2009,
              11): defaultdict(int,
                         {'materials science': 41,
                          'quantum physics': 5,
                          'superconductivity': 25,
                          'statistical mechanics': 27,
                          'soft condensed matter': 17,
                          'mesoscale and nanoscale physics': 50,
                          'quantum gases': 9,
                          'strongly correlated electrons': 26,
                          'mathematical physics': 1,
                          'disordered systems and neural networks': 1,
                          'other condensed matter': 1}),
             (2007,
              9): defaultdict(int,
                         {'materials science': 36,
                          'mesoscale and nanoscale physics': 28,
                          'statistical mechanics': 27,
                          'other condensed matter': 5,
                          'soft condensed matter': 20,
                          'superconductivity': 15,
                          'disordered systems and neural networks': 5,
                          'strongly correlated electrons': 26,
                          'quantum gases': 3,
                          'quantum physics': 2}),
             (2008,
              5): defaultdict(int,
                         {'materials science': 26,
                          'mesoscale and nanoscale physics': 34,
                          'soft condensed matter': 13,
                          'superconductivity': 23,
                          'statistical mechanics': 27,
                          'disordered systems and neural networks': 3,
                          'strongly correlated electrons': 23,
                          'other condensed matter': 6,
                          'quantum physics': 4,
                          'quantum gases': 2}),
             (2005,
              11): defaultdict(int,
                         {'mesoscale and nanoscale physics': 34,
                          'strongly correlated electrons': 33,
                          'other condensed matter': 6,
                          'soft condensed matter': 12,
                          'statistical mechanics': 34,
                          'materials science': 23,
                          'superconductivity': 16,
                          'disordered systems and neural networks': 3,
                          'high energy physics - theory': 1,
                          'quantum physics': 1}),
             (2002,
              7): defaultdict(int,
                         {'statistical mechanics': 50,
                          'disordered systems and neural networks': 3,
                          'mesoscale and nanoscale physics': 15,
                          'strongly correlated electrons': 28,
                          'materials science': 21,
                          'soft condensed matter': 11,
                          'superconductivity': 24,
                          'quantum gases': 1,
                          'condensed matter': 1,
                          'quantum physics': 2}),
             (2012,
              12): defaultdict(int,
                         {'strongly correlated electrons': 26,
                          'mesoscale and nanoscale physics': 51,
                          'materials science': 41,
                          'superconductivity': 18,
                          'soft condensed matter': 17,
                          'quantum gases': 16,
                          'statistical mechanics': 36,
                          'quantum physics': 7,
                          'high energy physics - lattice': 1,
                          'disordered systems and neural networks': 3,
                          'high energy physics - theory': 1}),
             (2008,
              11): defaultdict(int,
                         {'mesoscale and nanoscale physics': 36,
                          'materials science': 21,
                          'superconductivity': 26,
                          'strongly correlated electrons': 25,
                          'statistical mechanics': 39,
                          'disordered systems and neural networks': 1,
                          'soft condensed matter': 8,
                          'quantum gases': 1,
                          'quantum physics': 1,
                          'other condensed matter': 8}),
             (2013,
              1): defaultdict(int,
                         {'strongly correlated electrons': 37,
                          'materials science': 66,
                          'mesoscale and nanoscale physics': 43,
                          'statistical mechanics': 35,
                          'quantum physics': 5,
                          'superconductivity': 22,
                          'soft condensed matter': 16,
                          'quantum gases': 19,
                          'disordered systems and neural networks': 2}),
             (2010,
              8): defaultdict(int,
                         {'materials science': 41,
                          'superconductivity': 21,
                          'statistical mechanics': 34,
                          'mesoscale and nanoscale physics': 43,
                          'quantum gases': 14,
                          'strongly correlated electrons': 27,
                          'soft condensed matter': 10,
                          'quantum physics': 5,
                          'other condensed matter': 1,
                          'high energy physics - theory': 1,
                          'disordered systems and neural networks': 1}),
             (2003,
              12): defaultdict(int,
                         {'superconductivity': 20,
                          'strongly correlated electrons': 26,
                          'other condensed matter': 4,
                          'mesoscale and nanoscale physics': 31,
                          'statistical mechanics': 48,
                          'condensed matter': 1,
                          'soft condensed matter': 10,
                          'materials science': 14,
                          'disordered systems and neural networks': 3,
                          'quantum physics': 3,
                          'quantum gases': 1}),
             (2008,
              9): defaultdict(int,
                         {'strongly correlated electrons': 33,
                          'superconductivity': 26,
                          'statistical mechanics': 36,
                          'mesoscale and nanoscale physics': 37,
                          'materials science': 24,
                          'quantum physics': 1,
                          'soft condensed matter': 6,
                          'other condensed matter': 4,
                          'quantum gases': 4,
                          'high energy physics - theory': 2,
                          'disordered systems and neural networks': 1,
                          'physics - physics and society': 1}),
             (2013,
              5): defaultdict(int,
                         {'materials science': 53,
                          'statistical mechanics': 47,
                          'mesoscale and nanoscale physics': 63,
                          'strongly correlated electrons': 22,
                          'quantum gases': 11,
                          'soft condensed matter': 19,
                          'quantum physics': 7,
                          'superconductivity': 18,
                          'high energy physics - theory': 1,
                          'disordered systems and neural networks': 1}),
             (2006,
              5): defaultdict(int,
                         {'statistical mechanics': 44,
                          'quantum gases': 3,
                          'strongly correlated electrons': 24,
                          'superconductivity': 22,
                          'mesoscale and nanoscale physics': 22,
                          'materials science': 26,
                          'other condensed matter': 8,
                          'soft condensed matter': 17,
                          'disordered systems and neural networks': 2,
                          'quantum physics': 1}),
             (2007,
              4): defaultdict(int,
                         {'mesoscale and nanoscale physics': 32,
                          'statistical mechanics': 29,
                          'strongly correlated electrons': 32,
                          'materials science': 32,
                          'high energy physics - theory': 1,
                          'superconductivity': 16,
                          'soft condensed matter': 14,
                          'quantum physics': 3,
                          'disordered systems and neural networks': 1,
                          'other condensed matter': 3,
                          'quantum gases': 1}),
             (2007,
              10): defaultdict(int,
                         {'statistical mechanics': 40,
                          'mesoscale and nanoscale physics': 44,
                          'materials science': 28,
                          'superconductivity': 13,
                          'quantum gases': 4,
                          'soft condensed matter': 14,
                          'strongly correlated electrons': 33,
                          'other condensed matter': 7,
                          'quantum physics': 1,
                          'disordered systems and neural networks': 1}),
             (1998,
              4): defaultdict(int,
                         {'strongly correlated electrons': 19,
                          'superconductivity': 11,
                          'statistical mechanics': 35,
                          'mesoscale and nanoscale physics': 6,
                          'soft condensed matter': 3,
                          'disordered systems and neural networks': 3,
                          'condensed matter': 2,
                          'materials science': 2}),
             (2013,
              11): defaultdict(int,
                         {'mesoscale and nanoscale physics': 53,
                          'soft condensed matter': 21,
                          'disordered systems and neural networks': 3,
                          'superconductivity': 24,
                          'strongly correlated electrons': 30,
                          'materials science': 61,
                          'quantum gases': 10,
                          'statistical mechanics': 32,
                          'high energy physics - theory': 2,
                          'quantum physics': 8,
                          'physics - physics and society': 1}),
             (2005,
              9): defaultdict(int,
                         {'materials science': 31,
                          'quantum physics': 2,
                          'disordered systems and neural networks': 5,
                          'soft condensed matter': 15,
                          'strongly correlated electrons': 23,
                          'superconductivity': 22,
                          'statistical mechanics': 45,
                          'mesoscale and nanoscale physics': 24,
                          'other condensed matter': 11,
                          'quantum gases': 1,
                          'high energy physics - theory': 1}),
             (2004,
              8): defaultdict(int,
                         {'statistical mechanics': 42,
                          'mesoscale and nanoscale physics': 25,
                          'superconductivity': 19,
                          'soft condensed matter': 9,
                          'quantum physics': 2,
                          'strongly correlated electrons': 22,
                          'quantum gases': 1,
                          'materials science': 27,
                          'other condensed matter': 2,
                          'disordered systems and neural networks': 3}),
             (1998,
              7): defaultdict(int,
                         {'mesoscale and nanoscale physics': 13,
                          'materials science': 3,
                          'statistical mechanics': 37,
                          'strongly correlated electrons': 20,
                          'superconductivity': 4,
                          'quantum gases': 1,
                          'condensed matter': 5,
                          'disordered systems and neural networks': 3,
                          'soft condensed matter': 2}),
             (2010,
              6): defaultdict(int,
                         {'mesoscale and nanoscale physics': 49,
                          'superconductivity': 31,
                          'strongly correlated electrons': 38,
                          'soft condensed matter': 18,
                          'materials science': 26,
                          'statistical mechanics': 34,
                          'quantum gases': 21,
                          'quantum physics': 3,
                          'high energy physics - theory': 1,
                          'disordered systems and neural networks': 3,
                          'other condensed matter': 2}),
             (2000,
              5): defaultdict(int,
                         {'statistical mechanics': 41,
                          'strongly correlated electrons': 18,
                          'superconductivity': 14,
                          'soft condensed matter': 10,
                          'mesoscale and nanoscale physics': 12,
                          'disordered systems and neural networks': 5,
                          'materials science': 9,
                          'condensed matter': 3,
                          'other condensed matter': 1}),
             (1999,
              8): defaultdict(int,
                         {'statistical mechanics': 38,
                          'strongly correlated electrons': 21,
                          'superconductivity': 11,
                          'mesoscale and nanoscale physics': 21,
                          'condensed matter': 1,
                          'disordered systems and neural networks': 2,
                          'soft condensed matter': 5,
                          'materials science': 3}),
             (1997,
              6): defaultdict(int,
                         {'statistical mechanics': 25,
                          'superconductivity': 6,
                          'strongly correlated electrons': 16,
                          'mesoscale and nanoscale physics': 13,
                          'condensed matter': 3,
                          'materials science': 4,
                          'disordered systems and neural networks': 1,
                          'soft condensed matter': 2}),
             (2002,
              8): defaultdict(int,
                         {'materials science': 13,
                          'other condensed matter': 2,
                          'superconductivity': 12,
                          'soft condensed matter': 9,
                          'statistical mechanics': 44,
                          'high energy physics - theory': 1,
                          'mesoscale and nanoscale physics': 17,
                          'strongly correlated electrons': 13,
                          'disordered systems and neural networks': 2,
                          'quantum gases': 2,
                          'condensed matter': 1}),
             (2006,
              10): defaultdict(int,
                         {'materials science': 33,
                          'superconductivity': 23,
                          'quantum gases': 3,
                          'soft condensed matter': 15,
                          'strongly correlated electrons': 30,
                          'mesoscale and nanoscale physics': 40,
                          'statistical mechanics': 30,
                          'disordered systems and neural networks': 5,
                          'other condensed matter': 9,
                          'quantum physics': 1}),
             (2010,
              11): defaultdict(int,
                         {'statistical mechanics': 44,
                          'materials science': 44,
                          'mesoscale and nanoscale physics': 43,
                          'strongly correlated electrons': 30,
                          'quantum gases': 15,
                          'superconductivity': 21,
                          'soft condensed matter': 23,
                          'quantum physics': 4,
                          'other condensed matter': 1}),
             (2012,
              11): defaultdict(int,
                         {'soft condensed matter': 22,
                          'mesoscale and nanoscale physics': 47,
                          'statistical mechanics': 50,
                          'quantum gases': 19,
                          'strongly correlated electrons': 34,
                          'quantum physics': 8,
                          'superconductivity': 20,
                          'materials science': 39,
                          'physics - physics and society': 1,
                          'disordered systems and neural networks': 1,
                          'other condensed matter': 1}),
             (2011,
              4): defaultdict(int,
                         {'statistical mechanics': 39,
                          'strongly correlated electrons': 41,
                          'superconductivity': 19,
                          'mesoscale and nanoscale physics': 46,
                          'materials science': 31,
                          'quantum gases': 7,
                          'disordered systems and neural networks': 5,
                          'quantum physics': 7,
                          'soft condensed matter': 14}),
             (1999,
              1): defaultdict(int,
                         {'condensed matter': 4,
                          'materials science': 10,
                          'statistical mechanics': 23,
                          'strongly correlated electrons': 16,
                          'superconductivity': 8,
                          'mesoscale and nanoscale physics': 9,
                          'quantum gases': 2,
                          'disordered systems and neural networks': 3,
                          'soft condensed matter': 4}),
             (2001,
              7): defaultdict(int,
                         {'statistical mechanics': 38,
                          'mesoscale and nanoscale physics': 18,
                          'superconductivity': 25,
                          'disordered systems and neural networks': 7,
                          'strongly correlated electrons': 32,
                          'materials science': 19,
                          'condensed matter': 3,
                          'soft condensed matter': 7}),
             (2011,
              9): defaultdict(int,
                         {'materials science': 32,
                          'strongly correlated electrons': 32,
                          'mesoscale and nanoscale physics': 52,
                          'statistical mechanics': 38,
                          'superconductivity': 28,
                          'quantum gases': 17,
                          'high energy physics - theory': 1,
                          'soft condensed matter': 13,
                          'quantum physics': 5,
                          'disordered systems and neural networks': 4}),
             (2000,
              8): defaultdict(int,
                         {'materials science': 11,
                          'statistical mechanics': 40,
                          'mesoscale and nanoscale physics': 12,
                          'superconductivity': 12,
                          'soft condensed matter': 7,
                          'condensed matter': 6,
                          'disordered systems and neural networks': 1,
                          'other condensed matter': 1,
                          'strongly correlated electrons': 16}),
             (2012,
              3): defaultdict(int,
                         {'soft condensed matter': 19,
                          'mesoscale and nanoscale physics': 60,
                          'quantum gases': 10,
                          'materials science': 46,
                          'statistical mechanics': 47,
                          'superconductivity': 28,
                          'physics - physics and society': 1,
                          'strongly correlated electrons': 26,
                          'disordered systems and neural networks': 2,
                          'quantum physics': 3}),
             (2004,
              1): defaultdict(int,
                         {'materials science': 27,
                          'statistical mechanics': 40,
                          'soft condensed matter': 6,
                          'superconductivity': 16,
                          'strongly correlated electrons': 21,
                          'other condensed matter': 6,
                          'mesoscale and nanoscale physics': 21,
                          'disordered systems and neural networks': 1,
                          'quantum physics': 3}),
             (2014,
              2): defaultdict(int,
                         {'mesoscale and nanoscale physics': 38,
                          'statistical mechanics': 41,
                          'strongly correlated electrons': 31,
                          'superconductivity': 30,
                          'materials science': 43,
                          'soft condensed matter': 21,
                          'quantum gases': 13,
                          'quantum physics': 3,
                          'disordered systems and neural networks': 2,
                          'high energy physics - theory': 1}),
             (2006,
              3): defaultdict(int,
                         {'strongly correlated electrons': 39,
                          'mesoscale and nanoscale physics': 30,
                          'materials science': 27,
                          'superconductivity': 19,
                          'soft condensed matter': 12,
                          'statistical mechanics': 43,
                          'disordered systems and neural networks': 5,
                          'other condensed matter': 9,
                          'quantum gases': 2}),
             (2003,
              7): defaultdict(int,
                         {'mesoscale and nanoscale physics': 23,
                          'soft condensed matter': 8,
                          'strongly correlated electrons': 23,
                          'statistical mechanics': 54,
                          'disordered systems and neural networks': 5,
                          'superconductivity': 25,
                          'materials science': 23,
                          'other condensed matter': 2,
                          'condensed matter': 3,
                          'quantum gases': 2,
                          'quantum physics': 2}),
             (2006,
              7): defaultdict(int,
                         {'statistical mechanics': 44,
                          'mesoscale and nanoscale physics': 35,
                          'strongly correlated electrons': 28,
                          'superconductivity': 26,
                          'materials science': 33,
                          'other condensed matter': 10,
                          'quantum physics': 1,
                          'soft condensed matter': 9,
                          'disordered systems and neural networks': 2,
                          'quantum gases': 1}),
             (1993,
              7): defaultdict(int,
                         {'materials science': 1, 'condensed matter': 12}),
             (2013,
              9): defaultdict(int,
                         {'materials science': 53,
                          'statistical mechanics': 35,
                          'mesoscale and nanoscale physics': 74,
                          'disordered systems and neural networks': 1,
                          'strongly correlated electrons': 31,
                          'soft condensed matter': 24,
                          'quantum gases': 20,
                          'superconductivity': 21,
                          'quantum physics': 6}),
             (2006,
              9): defaultdict(int,
                         {'strongly correlated electrons': 28,
                          'other condensed matter': 13,
                          'materials science': 29,
                          'statistical mechanics': 41,
                          'disordered systems and neural networks': 3,
                          'soft condensed matter': 12,
                          'superconductivity': 23,
                          'mesoscale and nanoscale physics': 32,
                          'quantum gases': 1,
                          'high energy physics - theory': 1}),
             (2010,
              10): defaultdict(int,
                         {'materials science': 38,
                          'mesoscale and nanoscale physics': 64,
                          'superconductivity': 19,
                          'quantum gases': 18,
                          'physics - physics and society': 2,
                          'physics - biological physics': 1,
                          'soft condensed matter': 17,
                          'disordered systems and neural networks': 4,
                          'strongly correlated electrons': 23,
                          'statistical mechanics': 41,
                          'quantum physics': 4,
                          'high energy physics - theory': 1}),
             (2010,
              5): defaultdict(int,
                         {'mesoscale and nanoscale physics': 38,
                          'superconductivity': 23,
                          'strongly correlated electrons': 44,
                          'materials science': 36,
                          'statistical mechanics': 27,
                          'soft condensed matter': 18,
                          'quantum physics': 3,
                          'quantum gases': 19,
                          'disordered systems and neural networks': 3,
                          'other condensed matter': 1,
                          'high energy physics - theory': 2}),
             (2001,
              5): defaultdict(int,
                         {'statistical mechanics': 39,
                          'strongly correlated electrons': 17,
                          'mesoscale and nanoscale physics': 22,
                          'other condensed matter': 1,
                          'condensed matter': 3,
                          'superconductivity': 20,
                          'materials science': 9,
                          'soft condensed matter': 6,
                          'disordered systems and neural networks': 3,
                          'quantum physics': 1}),
             (1996,
              9): defaultdict(int,
                         {'condensed matter': 68,
                          'mesoscale and nanoscale physics': 1,
                          'materials science': 1}),
             (2001,
              9): defaultdict(int,
                         {'statistical mechanics': 36,
                          'superconductivity': 14,
                          'materials science': 10,
                          'mesoscale and nanoscale physics': 24,
                          'strongly correlated electrons': 25,
                          'other condensed matter': 1,
                          'soft condensed matter': 6,
                          'disordered systems and neural networks': 1,
                          'condensed matter': 3,
                          'quantum physics': 1}),
             (2006,
              8): defaultdict(int,
                         {'materials science': 22,
                          'quantum gases': 2,
                          'mesoscale and nanoscale physics': 30,
                          'strongly correlated electrons': 24,
                          'soft condensed matter': 7,
                          'superconductivity': 14,
                          'statistical mechanics': 36,
                          'other condensed matter': 5,
                          'disordered systems and neural networks': 2,
                          'high energy physics - theory': 1}),
             (2011,
              6): defaultdict(int,
                         {'mesoscale and nanoscale physics': 43,
                          'statistical mechanics': 40,
                          'materials science': 54,
                          'superconductivity': 25,
                          'soft condensed matter': 20,
                          'quantum physics': 4,
                          'strongly correlated electrons': 28,
                          'quantum gases': 14,
                          'disordered systems and neural networks': 2}),
             (2004,
              2): defaultdict(int,
                         {'superconductivity': 25,
                          'strongly correlated electrons': 21,
                          'statistical mechanics': 39,
                          'mesoscale and nanoscale physics': 28,
                          'materials science': 20,
                          'other condensed matter': 10,
                          'soft condensed matter': 16,
                          'quantum physics': 1,
                          'disordered systems and neural networks': 3}),
             (2004,
              11): defaultdict(int,
                         {'strongly correlated electrons': 25,
                          'statistical mechanics': 41,
                          'superconductivity': 17,
                          'soft condensed matter': 12,
                          'mesoscale and nanoscale physics': 36,
                          'materials science': 25,
                          'other condensed matter': 4,
                          'quantum physics': 2,
                          'quantum gases': 2,
                          'disordered systems and neural networks': 1}),
             (1999,
              11): defaultdict(int,
                         {'strongly correlated electrons': 16,
                          'soft condensed matter': 9,
                          'mesoscale and nanoscale physics': 20,
                          'superconductivity': 16,
                          'statistical mechanics': 43,
                          'materials science': 8,
                          'condensed matter': 6,
                          'disordered systems and neural networks': 3}),
             (2010,
              7): defaultdict(int,
                         {'soft condensed matter': 15,
                          'materials science': 51,
                          'statistical mechanics': 30,
                          'superconductivity': 20,
                          'mesoscale and nanoscale physics': 58,
                          'strongly correlated electrons': 30,
                          'quantum physics': 8,
                          'quantum gases': 13,
                          'disordered systems and neural networks': 5,
                          'high energy physics - theory': 1}),
             (1999,
              6): defaultdict(int,
                         {'mesoscale and nanoscale physics': 14,
                          'statistical mechanics': 32,
                          'strongly correlated electrons': 16,
                          'superconductivity': 13,
                          'high energy physics - theory': 2,
                          'soft condensed matter': 1,
                          'condensed matter': 2,
                          'materials science': 6,
                          'disordered systems and neural networks': 3}),
             (2012,
              2): defaultdict(int,
                         {'mesoscale and nanoscale physics': 59,
                          'materials science': 34,
                          'statistical mechanics': 40,
                          'superconductivity': 25,
                          'quantum gases': 20,
                          'disordered systems and neural networks': 3,
                          'strongly correlated electrons': 36,
                          'soft condensed matter': 10,
                          'quantum physics': 8}),
             (1995, 9): defaultdict(int, {'condensed matter': 37}),
             (2011,
              3): defaultdict(int,
                         {'mesoscale and nanoscale physics': 49,
                          'statistical mechanics': 39,
                          'soft condensed matter': 20,
                          'quantum gases': 12,
                          'strongly correlated electrons': 27,
                          'superconductivity': 20,
                          'materials science': 40,
                          'quantum physics': 4,
                          'disordered systems and neural networks': 2,
                          'other condensed matter': 1}),
             (2005,
              12): defaultdict(int,
                         {'mesoscale and nanoscale physics': 38,
                          'statistical mechanics': 37,
                          'strongly correlated electrons': 26,
                          'materials science': 19,
                          'soft condensed matter': 16,
                          'other condensed matter': 5,
                          'superconductivity': 13,
                          'high energy physics - theory': 1,
                          'disordered systems and neural networks': 1}),
             (2013,
              3): defaultdict(int,
                         {'strongly correlated electrons': 37,
                          'superconductivity': 32,
                          'statistical mechanics': 32,
                          'materials science': 67,
                          'mesoscale and nanoscale physics': 62,
                          'quantum gases': 10,
                          'soft condensed matter': 20,
                          'disordered systems and neural networks': 2,
                          'quantum physics': 3}),
             (1998,
              8): defaultdict(int,
                         {'mesoscale and nanoscale physics': 9,
                          'statistical mechanics': 21,
                          'strongly correlated electrons': 16,
                          'superconductivity': 8,
                          'condensed matter': 3,
                          'materials science': 7,
                          'disordered systems and neural networks': 3,
                          'soft condensed matter': 3}),
             (2000,
              1): defaultdict(int,
                         {'statistical mechanics': 28,
                          'soft condensed matter': 5,
                          'materials science': 9,
                          'strongly correlated electrons': 18,
                          'disordered systems and neural networks': 4,
                          'mesoscale and nanoscale physics': 16,
                          'superconductivity': 16,
                          'condensed matter': 2,
                          'high energy physics - theory': 1}),
             (2013,
              6): defaultdict(int,
                         {'strongly correlated electrons': 37,
                          'soft condensed matter': 26,
                          'materials science': 49,
                          'mesoscale and nanoscale physics': 47,
                          'statistical mechanics': 35,
                          'quantum physics': 3,
                          'quantum gases': 13,
                          'physics - physics and society': 1,
                          'superconductivity': 19,
                          'disordered systems and neural networks': 3}),
             (2011,
              7): defaultdict(int,
                         {'soft condensed matter': 22,
                          'quantum physics': 6,
                          'strongly correlated electrons': 27,
                          'quantum gases': 14,
                          'statistical mechanics': 31,
                          'mesoscale and nanoscale physics': 40,
                          'physics - atomic physics': 1,
                          'materials science': 35,
                          'superconductivity': 29,
                          'high energy physics - theory': 1,
                          'disordered systems and neural networks': 1}),
             (2011,
              8): defaultdict(int,
                         {'quantum gases': 23,
                          'materials science': 55,
                          'strongly correlated electrons': 28,
                          'soft condensed matter': 15,
                          'statistical mechanics': 43,
                          'mesoscale and nanoscale physics': 53,
                          'superconductivity': 22,
                          'quantum physics': 3,
                          'high energy physics - theory': 1,
                          'other condensed matter': 1}),
             (2009,
              2): defaultdict(int,
                         {'soft condensed matter': 13,
                          'mesoscale and nanoscale physics': 34,
                          'statistical mechanics': 34,
                          'materials science': 33,
                          'disordered systems and neural networks': 6,
                          'strongly correlated electrons': 17,
                          'quantum gases': 8,
                          'superconductivity': 22,
                          'quantum physics': 3}),
             (1998,
              9): defaultdict(int,
                         {'mesoscale and nanoscale physics': 11,
                          'statistical mechanics': 31,
                          'strongly correlated electrons': 18,
                          'superconductivity': 15,
                          'materials science': 7,
                          'soft condensed matter': 7,
                          'disordered systems and neural networks': 3,
                          'condensed matter': 1}),
             (2008,
              4): defaultdict(int,
                         {'mesoscale and nanoscale physics': 38,
                          'superconductivity': 25,
                          'strongly correlated electrons': 31,
                          'soft condensed matter': 6,
                          'disordered systems and neural networks': 2,
                          'materials science': 30,
                          'statistical mechanics': 37,
                          'other condensed matter': 6,
                          'high energy physics - theory': 1,
                          'quantum physics': 1}),
             (2000,
              2): defaultdict(int,
                         {'strongly correlated electrons': 16,
                          'statistical mechanics': 39,
                          'superconductivity': 20,
                          'mesoscale and nanoscale physics': 14,
                          'condensed matter': 1,
                          'soft condensed matter': 5,
                          'materials science': 4,
                          'quantum physics': 1,
                          'disordered systems and neural networks': 1,
                          'other condensed matter': 1}),
             (2000,
              10): defaultdict(int,
                         {'mesoscale and nanoscale physics': 18,
                          'superconductivity': 13,
                          'strongly correlated electrons': 23,
                          'statistical mechanics': 36,
                          'soft condensed matter': 5,
                          'materials science': 7,
                          'disordered systems and neural networks': 4}),
             (2001,
              6): defaultdict(int,
                         {'statistical mechanics': 40,
                          'strongly correlated electrons': 33,
                          'materials science': 16,
                          'superconductivity': 25,
                          'mesoscale and nanoscale physics': 25,
                          'condensed matter': 4,
                          'soft condensed matter': 9,
                          'disordered systems and neural networks': 3,
                          'other condensed matter': 1,
                          'high energy physics - theory': 1}),
             (2003,
              6): defaultdict(int,
                         {'materials science': 17,
                          'soft condensed matter': 15,
                          'statistical mechanics': 41,
                          'condensed matter': 3,
                          'strongly correlated electrons': 28,
                          'mesoscale and nanoscale physics': 25,
                          'superconductivity': 34,
                          'other condensed matter': 3,
                          'disordered systems and neural networks': 5}),
             (2009,
              4): defaultdict(int,
                         {'strongly correlated electrons': 29,
                          'quantum physics': 5,
                          'materials science': 38,
                          'mesoscale and nanoscale physics': 29,
                          'quantum gases': 9,
                          'superconductivity': 21,
                          'statistical mechanics': 26,
                          'soft condensed matter': 7,
                          'disordered systems and neural networks': 2,
                          'other condensed matter': 2}),
             (2006,
              6): defaultdict(int,
                         {'strongly correlated electrons': 40,
                          'mesoscale and nanoscale physics': 34,
                          'superconductivity': 19,
                          'statistical mechanics': 32,
                          'quantum physics': 2,
                          'soft condensed matter': 8,
                          'materials science': 29,
                          'high energy physics - theory': 1,
                          'other condensed matter': 5,
                          'disordered systems and neural networks': 4}),
             (2004,
              5): defaultdict(int,
                         {'mesoscale and nanoscale physics': 28,
                          'statistical mechanics': 42,
                          'materials science': 27,
                          'strongly correlated electrons': 26,
                          'quantum physics': 4,
                          'soft condensed matter': 14,
                          'superconductivity': 16,
                          'other condensed matter': 6,
                          'disordered systems and neural networks': 6,
                          'quantum gases': 1}),
             (1997,
              3): defaultdict(int,
                         {'superconductivity': 8,
                          'strongly correlated electrons': 17,
                          'statistical mechanics': 17,
                          'materials science': 6,
                          'quantum gases': 1,
                          'mesoscale and nanoscale physics': 7,
                          'condensed matter': 1,
                          'disordered systems and neural networks': 2}),
             (2007,
              3): defaultdict(int,
                         {'statistical mechanics': 42,
                          'quantum gases': 1,
                          'strongly correlated electrons': 23,
                          'materials science': 36,
                          'soft condensed matter': 14,
                          'nuclear theory': 1,
                          'disordered systems and neural networks': 4,
                          'superconductivity': 17,
                          'other condensed matter': 9,
                          'mesoscale and nanoscale physics': 32}),
             (1999,
              2): defaultdict(int,
                         {'condensed matter': 3,
                          'superconductivity': 14,
                          'materials science': 5,
                          'strongly correlated electrons': 17,
                          'statistical mechanics': 25,
                          'mesoscale and nanoscale physics': 11,
                          'quantum gases': 1,
                          'high energy physics - theory': 1,
                          'soft condensed matter': 1,
                          'disordered systems and neural networks': 1}),
             (2002,
              9): defaultdict(int,
                         {'statistical mechanics': 40,
                          'mesoscale and nanoscale physics': 38,
                          'soft condensed matter': 11,
                          'strongly correlated electrons': 16,
                          'superconductivity': 18,
                          'condensed matter': 1,
                          'high energy physics - theory': 2,
                          'materials science': 12,
                          'quantum physics': 1,
                          'disordered systems and neural networks': 3,
                          'quantum gases': 2,
                          'other condensed matter': 1}),
             (2009,
              10): defaultdict(int,
                         {'materials science': 40,
                          'mesoscale and nanoscale physics': 34,
                          'superconductivity': 29,
                          'statistical mechanics': 49,
                          'strongly correlated electrons': 27,
                          'quantum gases': 12,
                          'disordered systems and neural networks': 4,
                          'other condensed matter': 1,
                          'soft condensed matter': 17,
                          'quantum physics': 2}),
             (2010,
              3): defaultdict(int,
                         {'materials science': 35,
                          'statistical mechanics': 44,
                          'mesoscale and nanoscale physics': 56,
                          'strongly correlated electrons': 31,
                          'quantum physics': 7,
                          'soft condensed matter': 13,
                          'disordered systems and neural networks': 4,
                          'superconductivity': 23,
                          'quantum gases': 12,
                          'high energy physics - theory': 1}),
             (2008,
              7): defaultdict(int,
                         {'statistical mechanics': 41,
                          'strongly correlated electrons': 27,
                          'mesoscale and nanoscale physics': 45,
                          'materials science': 29,
                          'superconductivity': 33,
                          'soft condensed matter': 17,
                          'other condensed matter': 12,
                          'quantum gases': 2,
                          'disordered systems and neural networks': 1}),
             (2002,
              3): defaultdict(int,
                         {'materials science': 18,
                          'mesoscale and nanoscale physics': 20,
                          'statistical mechanics': 48,
                          'strongly correlated electrons': 20,
                          'superconductivity': 21,
                          'condensed matter': 2,
                          'quantum physics': 1,
                          'high energy physics - theory': 2,
                          'soft condensed matter': 9,
                          'disordered systems and neural networks': 3,
                          'other condensed matter': 1,
                          'quantum gases': 1}),
             (2012,
              5): defaultdict(int,
                         {'quantum physics': 4,
                          'mesoscale and nanoscale physics': 54,
                          'materials science': 40,
                          'statistical mechanics': 47,
                          'quantum gases': 15,
                          'superconductivity': 30,
                          'strongly correlated electrons': 40,
                          'soft condensed matter': 13,
                          'high energy physics - theory': 2,
                          'physics - physics and society': 1,
                          'disordered systems and neural networks': 1}),
             (2013,
              7): defaultdict(int,
                         {'soft condensed matter': 19,
                          'superconductivity': 31,
                          'strongly correlated electrons': 50,
                          'mesoscale and nanoscale physics': 53,
                          'materials science': 55,
                          'statistical mechanics': 49,
                          'quantum physics': 8,
                          'disordered systems and neural networks': 5,
                          'physics - physics and society': 2,
                          'quantum gases': 16,
                          'high energy physics - theory': 1}),
             (2000,
              6): defaultdict(int,
                         {'strongly correlated electrons': 12,
                          'condensed matter': 4,
                          'superconductivity': 12,
                          'statistical mechanics': 41,
                          'materials science': 13,
                          'mesoscale and nanoscale physics': 15,
                          'quantum physics': 2,
                          'soft condensed matter': 10,
                          'disordered systems and neural networks': 2}),
             (2013,
              10): defaultdict(int,
                         {'superconductivity': 26,
                          'soft condensed matter': 22,
                          'materials science': 54,
                          'mesoscale and nanoscale physics': 56,
                          'strongly correlated electrons': 35,
                          'statistical mechanics': 46,
                          'disordered systems and neural networks': 3,
                          'quantum gases': 10,
                          'quantum physics': 3,
                          'high energy physics - theory': 2}),
             (1999,
              4): defaultdict(int,
                         {'superconductivity': 13,
                          'statistical mechanics': 26,
                          'mesoscale and nanoscale physics': 13,
                          'soft condensed matter': 6,
                          'materials science': 5,
                          'strongly correlated electrons': 21,
                          'condensed matter': 2,
                          'disordered systems and neural networks': 4}),
             (2001,
              11): defaultdict(int,
                         {'strongly correlated electrons': 29,
                          'soft condensed matter': 6,
                          'statistical mechanics': 46,
                          'superconductivity': 21,
                          'materials science': 8,
                          'mesoscale and nanoscale physics': 13,
                          'other condensed matter': 2,
                          'quantum physics': 2,
                          'disordered systems and neural networks': 6,
                          'condensed matter': 3}),
             (1998,
              10): defaultdict(int,
                         {'mesoscale and nanoscale physics': 21,
                          'materials science': 3,
                          'statistical mechanics': 30,
                          'disordered systems and neural networks': 2,
                          'soft condensed matter': 8,
                          'superconductivity': 10,
                          'high energy physics - theory': 1,
                          'strongly correlated electrons': 14,
                          'condensed matter': 2,
                          'high energy physics - lattice': 1}),
             (2009,
              3): defaultdict(int,
                         {'quantum gases': 9,
                          'superconductivity': 31,
                          'statistical mechanics': 31,
                          'strongly correlated electrons': 33,
                          'mesoscale and nanoscale physics': 39,
                          'soft condensed matter': 16,
                          'disordered systems and neural networks': 6,
                          'quantum physics': 2,
                          'materials science': 28,
                          'high energy physics - theory': 1}),
             (2003,
              8): defaultdict(int,
                         {'soft condensed matter': 12,
                          'mesoscale and nanoscale physics': 24,
                          'statistical mechanics': 42,
                          'superconductivity': 16,
                          'strongly correlated electrons': 17,
                          'materials science': 16,
                          'other condensed matter': 4,
                          'quantum physics': 2,
                          'condensed matter': 5,
                          'disordered systems and neural networks': 2}),
             (2003,
              1): defaultdict(int,
                         {'statistical mechanics': 44,
                          'mesoscale and nanoscale physics': 30,
                          'materials science': 14,
                          'quantum physics': 3,
                          'strongly correlated electrons': 14,
                          'superconductivity': 11,
                          'soft condensed matter': 9,
                          'disordered systems and neural networks': 3,
                          'condensed matter': 2}),
             (1995,
              10): defaultdict(int,
                         {'condensed matter': 45, 'materials science': 1}),
             (2011,
              1): defaultdict(int,
                         {'mesoscale and nanoscale physics': 48,
                          'disordered systems and neural networks': 2,
                          'materials science': 44,
                          'strongly correlated electrons': 29,
                          'soft condensed matter': 18,
                          'quantum gases': 13,
                          'superconductivity': 25,
                          'statistical mechanics': 29,
                          'quantum physics': 2}),
             (2013,
              2): defaultdict(int,
                         {'statistical mechanics': 36,
                          'strongly correlated electrons': 23,
                          'materials science': 41,
                          'disordered systems and neural networks': 2,
                          'superconductivity': 29,
                          'quantum gases': 15,
                          'mesoscale and nanoscale physics': 56,
                          'quantum physics': 8,
                          'soft condensed matter': 21,
                          'high energy physics - theory': 1}),
             (1995,
              12): defaultdict(int,
                         {'condensed matter': 42, 'materials science': 1}),
             (2008,
              3): defaultdict(int,
                         {'materials science': 34,
                          'strongly correlated electrons': 29,
                          'soft condensed matter': 7,
                          'statistical mechanics': 37,
                          'superconductivity': 22,
                          'mesoscale and nanoscale physics': 39,
                          'quantum gases': 5,
                          'quantum physics': 5,
                          'other condensed matter': 5,
                          'disordered systems and neural networks': 2,
                          'high energy physics - theory': 1}),
             (2004,
              7): defaultdict(int,
                         {'statistical mechanics': 40,
                          'mesoscale and nanoscale physics': 38,
                          'superconductivity': 29,
                          'strongly correlated electrons': 28,
                          'disordered systems and neural networks': 4,
                          'materials science': 34,
                          'other condensed matter': 10,
                          'quantum physics': 3,
                          'soft condensed matter': 8}),
             (2011,
              11): defaultdict(int,
                         {'statistical mechanics': 40,
                          'soft condensed matter': 16,
                          'mesoscale and nanoscale physics': 53,
                          'quantum gases': 14,
                          'physics - chemical physics': 1,
                          'materials science': 46,
                          'strongly correlated electrons': 38,
                          'superconductivity': 23,
                          'disordered systems and neural networks': 2,
                          'quantum physics': 7,
                          'physics - optics': 1,
                          'physics - physics and society': 1}),
             (2009,
              9): defaultdict(int,
                         {'materials science': 33,
                          'soft condensed matter': 16,
                          'mesoscale and nanoscale physics': 39,
                          'superconductivity': 23,
                          'statistical mechanics': 28,
                          'quantum gases': 14,
                          'quantum physics': 2,
                          'strongly correlated electrons': 31,
                          'disordered systems and neural networks': 3,
                          'physics - physics and society': 1}),
             (2007,
              12): defaultdict(int,
                         {'disordered systems and neural networks': 4,
                          'mesoscale and nanoscale physics': 34,
                          'statistical mechanics': 31,
                          'strongly correlated electrons': 29,
                          'soft condensed matter': 9,
                          'superconductivity': 11,
                          'materials science': 23,
                          'quantum physics': 3,
                          'other condensed matter': 5}),
             (1996,
              5): defaultdict(int,
                         {'condensed matter': 52, 'superconductivity': 1}),
             (2007,
              1): defaultdict(int,
                         {'materials science': 22,
                          'quantum gases': 3,
                          'statistical mechanics': 39,
                          'mesoscale and nanoscale physics': 37,
                          'soft condensed matter': 11,
                          'superconductivity': 12,
                          'other condensed matter': 6,
                          'strongly correlated electrons': 24,
                          'quantum physics': 1}),
             (2008,
              10): defaultdict(int,
                         {'mesoscale and nanoscale physics': 47,
                          'statistical mechanics': 41,
                          'strongly correlated electrons': 25,
                          'materials science': 49,
                          'superconductivity': 38,
                          'soft condensed matter': 12,
                          'quantum physics': 2,
                          'other condensed matter': 3,
                          'disordered systems and neural networks': 4,
                          'quantum gases': 1}),
             (2005,
              8): defaultdict(int,
                         {'strongly correlated electrons': 26,
                          'superconductivity': 32,
                          'other condensed matter': 5,
                          'statistical mechanics': 36,
                          'materials science': 27,
                          'mesoscale and nanoscale physics': 34,
                          'soft condensed matter': 18,
                          'disordered systems and neural networks': 5,
                          'quantum physics': 1}),
             (2000,
              4): defaultdict(int,
                         {'soft condensed matter': 9,
                          'superconductivity': 13,
                          'statistical mechanics': 29,
                          'mesoscale and nanoscale physics': 18,
                          'materials science': 10,
                          'strongly correlated electrons': 25,
                          'condensed matter': 4,
                          'disordered systems and neural networks': 3,
                          'other condensed matter': 1}),
             (1998,
              3): defaultdict(int,
                         {'materials science': 6,
                          'statistical mechanics': 34,
                          'mesoscale and nanoscale physics': 11,
                          'strongly correlated electrons': 19,
                          'condensed matter': 2,
                          'soft condensed matter': 4,
                          'superconductivity': 6,
                          'quantum gases': 1,
                          'quantum physics': 1}),
             (2002,
              1): defaultdict(int,
                         {'disordered systems and neural networks': 4,
                          'materials science': 14,
                          'superconductivity': 22,
                          'statistical mechanics': 34,
                          'mesoscale and nanoscale physics': 17,
                          'soft condensed matter': 12,
                          'strongly correlated electrons': 21,
                          'quantum physics': 1}),
             (2010,
              12): defaultdict(int,
                         {'materials science': 46,
                          'statistical mechanics': 37,
                          'mesoscale and nanoscale physics': 54,
                          'soft condensed matter': 20,
                          'strongly correlated electrons': 37,
                          'quantum gases': 19,
                          'superconductivity': 21,
                          'quantum physics': 13,
                          'disordered systems and neural networks': 2,
                          'physics - physics and society': 1,
                          'high energy physics - theory': 1}),
             (2004,
              10): defaultdict(int,
                         {'statistical mechanics': 42,
                          'superconductivity': 15,
                          'mesoscale and nanoscale physics': 34,
                          'materials science': 25,
                          'strongly correlated electrons': 23,
                          'other condensed matter': 11,
                          'soft condensed matter': 7,
                          'quantum physics': 1}),
             (2003,
              9): defaultdict(int,
                         {'strongly correlated electrons': 22,
                          'statistical mechanics': 47,
                          'materials science': 20,
                          'superconductivity': 21,
                          'mesoscale and nanoscale physics': 24,
                          'disordered systems and neural networks': 2,
                          'soft condensed matter': 9,
                          'condensed matter': 4,
                          'quantum gases': 1,
                          'quantum physics': 1}),
             (1999,
              10): defaultdict(int,
                         {'statistical mechanics': 38,
                          'superconductivity': 14,
                          'condensed matter': 5,
                          'materials science': 9,
                          'mesoscale and nanoscale physics': 15,
                          'strongly correlated electrons': 26,
                          'disordered systems and neural networks': 1,
                          'soft condensed matter': 5}),
             (2008,
              12): defaultdict(int,
                         {'statistical mechanics': 37,
                          'strongly correlated electrons': 30,
                          'mesoscale and nanoscale physics': 24,
                          'materials science': 27,
                          'other condensed matter': 12,
                          'superconductivity': 29,
                          'soft condensed matter': 19,
                          'quantum physics': 2,
                          'disordered systems and neural networks': 4,
                          'quantum gases': 1,
                          'physics - physics and society': 1}),
             (2012,
              8): defaultdict(int,
                         {'materials science': 36,
                          'mesoscale and nanoscale physics': 54,
                          'superconductivity': 35,
                          'quantum gases': 9,
                          'statistical mechanics': 22,
                          'soft condensed matter': 17,
                          'strongly correlated electrons': 27,
                          'disordered systems and neural networks': 5,
                          'quantum physics': 5,
                          'high energy physics - theory': 1}),
             (2012,
              6): defaultdict(int,
                         {'strongly correlated electrons': 33,
                          'mesoscale and nanoscale physics': 62,
                          'statistical mechanics': 46,
                          'materials science': 48,
                          'superconductivity': 33,
                          'quantum gases': 17,
                          'disordered systems and neural networks': 5,
                          'soft condensed matter': 13,
                          'nuclear theory': 1,
                          'quantum physics': 7,
                          'high energy physics - theory': 1,
                          'other condensed matter': 1}),
             (2007,
              11): defaultdict(int,
                         {'mesoscale and nanoscale physics': 34,
                          'statistical mechanics': 39,
                          'strongly correlated electrons': 31,
                          'materials science': 27,
                          'quantum gases': 2,
                          'quantum physics': 8,
                          'soft condensed matter': 11,
                          'superconductivity': 15,
                          'high energy physics - theory': 1,
                          'other condensed matter': 4,
                          'disordered systems and neural networks': 4}),
             (1992, 9): defaultdict(int, {'condensed matter': 10}),
             (2002,
              5): defaultdict(int,
                         {'strongly correlated electrons': 27,
                          'materials science': 16,
                          'soft condensed matter': 7,
                          'disordered systems and neural networks': 7,
                          'statistical mechanics': 35,
                          'superconductivity': 19,
                          'mesoscale and nanoscale physics': 16,
                          'quantum physics': 2,
                          'other condensed matter': 2,
                          'condensed matter': 1,
                          'quantum gases': 1}),
             (1996,
              1): defaultdict(int,
                         {'condensed matter': 25, 'materials science': 2}),
             (1998,
              5): defaultdict(int,
                         {'statistical mechanics': 29,
                          'disordered systems and neural networks': 2,
                          'condensed matter': 3,
                          'soft condensed matter': 6,
                          'other condensed matter': 2,
                          'materials science': 6,
                          'mesoscale and nanoscale physics': 9,
                          'strongly correlated electrons': 14,
                          'superconductivity': 12}),
             (2005,
              5): defaultdict(int,
                         {'superconductivity': 14,
                          'materials science': 28,
                          'statistical mechanics': 35,
                          'mesoscale and nanoscale physics': 32,
                          'soft condensed matter': 11,
                          'strongly correlated electrons': 22,
                          'quantum physics': 4,
                          'other condensed matter': 9,
                          'quantum gases': 2,
                          'disordered systems and neural networks': 4}),
             (2011,
              12): defaultdict(int,
                         {'materials science': 43,
                          'quantum physics': 8,
                          'mesoscale and nanoscale physics': 40,
                          'superconductivity': 24,
                          'statistical mechanics': 44,
                          'strongly correlated electrons': 26,
                          'quantum gases': 13,
                          'soft condensed matter': 13,
                          'mathematical physics': 2,
                          'disordered systems and neural networks': 3,
                          'general relativity and quantum cosmology': 1}),
             (1995, 4): defaultdict(int, {'condensed matter': 26}),
             (2002,
              12): defaultdict(int,
                         {'soft condensed matter': 8,
                          'materials science': 19,
                          'mesoscale and nanoscale physics': 25,
                          'statistical mechanics': 49,
                          'superconductivity': 21,
                          'strongly correlated electrons': 23,
                          'other condensed matter': 3,
                          'disordered systems and neural networks': 2,
                          'condensed matter': 5}),
             (2001,
              8): defaultdict(int,
                         {'statistical mechanics': 32,
                          'strongly correlated electrons': 21,
                          'soft condensed matter': 9,
                          'superconductivity': 21,
                          'materials science': 16,
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                          'quantum physics': 2,
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                          'high energy physics - theory': 1,
                          'other condensed matter': 1,
                          'condensed matter': 3,
                          'disordered systems and neural networks': 1}),
             (2004,
              3): defaultdict(int,
                         {'strongly correlated electrons': 26,
                          'mesoscale and nanoscale physics': 29,
                          'materials science': 25,
                          'statistical mechanics': 39,
                          'superconductivity': 13,
                          'other condensed matter': 5,
                          'soft condensed matter': 8,
                          'high energy physics - theory': 1,
                          'disordered systems and neural networks': 1,
                          'quantum gases': 2,
                          'quantum physics': 1}),
             (1997,
              11): defaultdict(int,
                         {'superconductivity': 8,
                          'strongly correlated electrons': 9,
                          'high energy physics - lattice': 1,
                          'mesoscale and nanoscale physics': 12,
                          'statistical mechanics': 22,
                          'soft condensed matter': 2,
                          'condensed matter': 2,
                          'materials science': 3,
                          'disordered systems and neural networks': 1}),
             (2005,
              7): defaultdict(int,
                         {'statistical mechanics': 43,
                          'materials science': 30,
                          'strongly correlated electrons': 32,
                          'soft condensed matter': 11,
                          'superconductivity': 21,
                          'mesoscale and nanoscale physics': 35,
                          'other condensed matter': 8,
                          'quantum physics': 5,
                          'disordered systems and neural networks': 5}),
             (1999,
              9): defaultdict(int,
                         {'statistical mechanics': 40,
                          'materials science': 11,
                          'superconductivity': 11,
                          'disordered systems and neural networks': 6,
                          'mesoscale and nanoscale physics': 8,
                          'strongly correlated electrons': 18,
                          'condensed matter': 1,
                          'soft condensed matter': 6,
                          'high energy physics - theory': 1}),
             (2007,
              8): defaultdict(int,
                         {'materials science': 32,
                          'mesoscale and nanoscale physics': 46,
                          'statistical mechanics': 39,
                          'soft condensed matter': 17,
                          'other condensed matter': 3,
                          'strongly correlated electrons': 27,
                          'superconductivity': 16,
                          'quantum physics': 2,
                          'disordered systems and neural networks': 2}),
             (2000,
              9): defaultdict(int,
                         {'statistical mechanics': 40,
                          'soft condensed matter': 6,
                          'strongly correlated electrons': 24,
                          'materials science': 8,
                          'superconductivity': 11,
                          'mesoscale and nanoscale physics': 18,
                          'disordered systems and neural networks': 2,
                          'condensed matter': 2,
                          'quantum physics': 2}),
             (1994, 1): defaultdict(int, {'condensed matter': 18}),
             (2003,
              4): defaultdict(int,
                         {'mesoscale and nanoscale physics': 24,
                          'strongly correlated electrons': 36,
                          'statistical mechanics': 33,
                          'superconductivity': 28,
                          'materials science': 23,
                          'soft condensed matter': 8,
                          'disordered systems and neural networks': 2,
                          'quantum physics': 1,
                          'other condensed matter': 1}),
             (2003,
              3): defaultdict(int,
                         {'mesoscale and nanoscale physics': 23,
                          'statistical mechanics': 47,
                          'superconductivity': 17,
                          'strongly correlated electrons': 18,
                          'materials science': 16,
                          'disordered systems and neural networks': 2,
                          'soft condensed matter': 6,
                          'other condensed matter': 1,
                          'quantum physics': 1,
                          'condensed matter': 2,
                          'quantum gases': 1}),
             (2003,
              11): defaultdict(int,
                         {'soft condensed matter': 7,
                          'strongly correlated electrons': 22,
                          'disordered systems and neural networks': 1,
                          'statistical mechanics': 39,
                          'superconductivity': 15,
                          'mesoscale and nanoscale physics': 29,
                          'condensed matter': 1,
                          'materials science': 16,
                          'quantum gases': 1,
                          'other condensed matter': 3,
                          'quantum physics': 3}),
             (2005,
              10): defaultdict(int,
                         {'strongly correlated electrons': 37,
                          'statistical mechanics': 38,
                          'soft condensed matter': 14,
                          'materials science': 25,
                          'mesoscale and nanoscale physics': 22,
                          'superconductivity': 29,
                          'other condensed matter': 7,
                          'disordered systems and neural networks': 2,
                          'high energy physics - theory': 2,
                          'quantum physics': 2,
                          'physics - chemical physics': 1}),
             (1995, 3): defaultdict(int, {'condensed matter': 43}),
             (2012,
              7): defaultdict(int,
                         {'materials science': 41,
                          'soft condensed matter': 16,
                          'superconductivity': 34,
                          'statistical mechanics': 42,
                          'strongly correlated electrons': 37,
                          'mesoscale and nanoscale physics': 60,
                          'quantum physics': 7,
                          'quantum gases': 25,
                          'other condensed matter': 1,
                          'disordered systems and neural networks': 3,
                          'high energy physics - theory': 3}),
             (2009,
              7): defaultdict(int,
                         {'materials science': 32,
                          'quantum gases': 10,
                          'mesoscale and nanoscale physics': 41,
                          'strongly correlated electrons': 35,
                          'statistical mechanics': 51,
                          'superconductivity': 23,
                          'disordered systems and neural networks': 2,
                          'soft condensed matter': 17,
                          'physics - physics and society': 1,
                          'quantum physics': 3}),
             (2001,
              12): defaultdict(int,
                         {'mesoscale and nanoscale physics': 17,
                          'other condensed matter': 1,
                          'strongly correlated electrons': 22,
                          'materials science': 12,
                          'superconductivity': 18,
                          'statistical mechanics': 37,
                          'quantum physics': 4,
                          'disordered systems and neural networks': 6,
                          'condensed matter': 2,
                          'soft condensed matter': 13,
                          'high energy physics - theory': 3}),
             (1997,
              12): defaultdict(int,
                         {'statistical mechanics': 25,
                          'disordered systems and neural networks': 4,
                          'mesoscale and nanoscale physics': 19,
                          'strongly correlated electrons': 11,
                          'superconductivity': 7,
                          'soft condensed matter': 3,
                          'materials science': 3,
                          'condensed matter': 1}),
             (1998,
              1): defaultdict(int,
                         {'materials science': 3,
                          'strongly correlated electrons': 12,
                          'superconductivity': 9,
                          'statistical mechanics': 21,
                          'soft condensed matter': 3,
                          'disordered systems and neural networks': 1,
                          'mesoscale and nanoscale physics': 11,
                          'condensed matter': 2}),
             (1992, 7): defaultdict(int, {'condensed matter': 7}),
             (2013,
              8): defaultdict(int,
                         {'strongly correlated electrons': 34,
                          'mesoscale and nanoscale physics': 58,
                          'materials science': 46,
                          'superconductivity': 29,
                          'quantum gases': 12,
                          'statistical mechanics': 33,
                          'quantum physics': 4,
                          'high energy physics - theory': 3,
                          'soft condensed matter': 13,
                          'physics - physics and society': 1}),
             (2009,
              12): defaultdict(int,
                         {'quantum gases': 16,
                          'mesoscale and nanoscale physics': 47,
                          'strongly correlated electrons': 33,
                          'materials science': 29,
                          'statistical mechanics': 32,
                          'superconductivity': 26,
                          'soft condensed matter': 15,
                          'disordered systems and neural networks': 2,
                          'other condensed matter': 1,
                          'quantum physics': 1}),
             (1997,
              4): defaultdict(int,
                         {'statistical mechanics': 22,
                          'disordered systems and neural networks': 3,
                          'soft condensed matter': 2,
                          'condensed matter': 3,
                          'strongly correlated electrons': 7,
                          'superconductivity': 7,
                          'mesoscale and nanoscale physics': 10,
                          'materials science': 2}),
             (2008,
              8): defaultdict(int,
                         {'materials science': 21,
                          'quantum gases': 4,
                          'superconductivity': 31,
                          'soft condensed matter': 13,
                          'strongly correlated electrons': 39,
                          'statistical mechanics': 32,
                          'disordered systems and neural networks': 3,
                          'mesoscale and nanoscale physics': 34,
                          'other condensed matter': 5,
                          'high energy physics - theory': 1}),
             (2014,
              4): defaultdict(int,
                         {'materials science': 51,
                          'superconductivity': 15,
                          'soft condensed matter': 20,
                          'mesoscale and nanoscale physics': 46,
                          'quantum physics': 4,
                          'statistical mechanics': 32,
                          'strongly correlated electrons': 35,
                          'quantum gases': 12,
                          'disordered systems and neural networks': 4,
                          'high energy physics - theory': 2}),
             (2011,
              5): defaultdict(int,
                         {'mesoscale and nanoscale physics': 67,
                          'statistical mechanics': 42,
                          'superconductivity': 34,
                          'soft condensed matter': 17,
                          'quantum gases': 14,
                          'disordered systems and neural networks': 3,
                          'materials science': 39,
                          'strongly correlated electrons': 25,
                          'mathematical physics': 1,
                          'other condensed matter': 1,
                          'quantum physics': 1}),
             (2004,
              9): defaultdict(int,
                         {'mesoscale and nanoscale physics': 25,
                          'superconductivity': 13,
                          'statistical mechanics': 36,
                          'strongly correlated electrons': 24,
                          'materials science': 27,
                          'soft condensed matter': 12,
                          'other condensed matter': 5,
                          'quantum physics': 1,
                          'disordered systems and neural networks': 2}),
             (1999,
              7): defaultdict(int,
                         {'mesoscale and nanoscale physics': 18,
                          'statistical mechanics': 27,
                          'strongly correlated electrons': 14,
                          'disordered systems and neural networks': 3,
                          'soft condensed matter': 4,
                          'superconductivity': 14,
                          'materials science': 8,
                          'other condensed matter': 1,
                          'condensed matter': 2,
                          'quantum physics': 1}),
             (2012,
              4): defaultdict(int,
                         {'soft condensed matter': 23,
                          'superconductivity': 24,
                          'materials science': 45,
                          'statistical mechanics': 36,
                          'mesoscale and nanoscale physics': 63,
                          'quantum gases': 23,
                          'strongly correlated electrons': 41,
                          'quantum physics': 5,
                          'disordered systems and neural networks': 4,
                          'high energy physics - theory': 1,
                          'other condensed matter': 1}),
             (1993, 11): defaultdict(int, {'condensed matter': 11}),
             (2001,
              10): defaultdict(int,
                         {'statistical mechanics': 52,
                          'materials science': 6,
                          'strongly correlated electrons': 20,
                          'mesoscale and nanoscale physics': 24,
                          'superconductivity': 25,
                          'soft condensed matter': 5,
                          'condensed matter': 6,
                          'disordered systems and neural networks': 4,
                          'quantum physics': 1}),
             (2008,
              6): defaultdict(int,
                         {'superconductivity': 30,
                          'strongly correlated electrons': 35,
                          'materials science': 23,
                          'mesoscale and nanoscale physics': 44,
                          'quantum physics': 2,
                          'statistical mechanics': 25,
                          'quantum gases': 4,
                          'soft condensed matter': 14,
                          'disordered systems and neural networks': 2,
                          'other condensed matter': 5,
                          'high energy physics - theory': 2}),
             (2004,
              12): defaultdict(int,
                         {'strongly correlated electrons': 26,
                          'mesoscale and nanoscale physics': 35,
                          'statistical mechanics': 35,
                          'materials science': 27,
                          'quantum physics': 4,
                          'soft condensed matter': 12,
                          'superconductivity': 24,
                          'quantum gases': 1,
                          'disordered systems and neural networks': 3,
                          'other condensed matter': 4}),
             (1993, 10): defaultdict(int, {'condensed matter': 20}),
             (1996, 4): defaultdict(int, {'condensed matter': 45}),
             (2002,
              11): defaultdict(int,
                         {'mesoscale and nanoscale physics': 20,
                          'strongly correlated electrons': 21,
                          'soft condensed matter': 23,
                          'statistical mechanics': 38,
                          'superconductivity': 20,
                          'quantum physics': 3,
                          'materials science': 16,
                          'condensed matter': 4,
                          'disordered systems and neural networks': 2,
                          'quantum gases': 1,
                          'other condensed matter': 1}),
             (2014,
              3): defaultdict(int,
                         {'mesoscale and nanoscale physics': 50,
                          'soft condensed matter': 24,
                          'disordered systems and neural networks': 6,
                          'superconductivity': 25,
                          'statistical mechanics': 40,
                          'high energy physics - theory': 4,
                          'materials science': 59,
                          'quantum physics': 5,
                          'quantum gases': 16,
                          'strongly correlated electrons': 37}),
             (2010,
              4): defaultdict(int,
                         {'materials science': 23,
                          'superconductivity': 29,
                          'mesoscale and nanoscale physics': 48,
                          'quantum gases': 10,
                          'statistical mechanics': 39,
                          'strongly correlated electrons': 29,
                          'soft condensed matter': 18,
                          'quantum physics': 1,
                          'high energy physics - theory': 1,
                          'disordered systems and neural networks': 3}),
             (1993,
              6): defaultdict(int,
                         {'condensed matter': 18, 'materials science': 1}),
             (1997,
              10): defaultdict(int,
                         {'superconductivity': 10,
                          'statistical mechanics': 31,
                          'mesoscale and nanoscale physics': 13,
                          'disordered systems and neural networks': 2,
                          'strongly correlated electrons': 17,
                          'condensed matter': 3,
                          'materials science': 5,
                          'soft condensed matter': 1}),
             (2000,
              7): defaultdict(int,
                         {'strongly correlated electrons': 32,
                          'statistical mechanics': 39,
                          'mesoscale and nanoscale physics': 11,
                          'soft condensed matter': 9,
                          'materials science': 5,
                          'disordered systems and neural networks': 4,
                          'superconductivity': 6,
                          'condensed matter': 4}),
             (1995,
              8): defaultdict(int,
                         {'condensed matter': 33, 'materials science': 2}),
             (1995,
              2): defaultdict(int,
                         {'condensed matter': 27,
                          'high energy physics - theory': 1,
                          'materials science': 2}),
             (2004,
              4): defaultdict(int,
                         {'statistical mechanics': 52,
                          'superconductivity': 15,
                          'mesoscale and nanoscale physics': 27,
                          'strongly correlated electrons': 35,
                          'materials science': 22,
                          'other condensed matter': 3,
                          'quantum gases': 4,
                          'disordered systems and neural networks': 2,
                          'soft condensed matter': 7,
                          'quantum physics': 1}),
             (2007,
              5): defaultdict(int,
                         {'superconductivity': 20,
                          'statistical mechanics': 39,
                          'other condensed matter': 9,
                          'materials science': 27,
                          'mesoscale and nanoscale physics': 32,
                          'quantum physics': 4,
                          'strongly correlated electrons': 21,
                          'soft condensed matter': 19,
                          'quantum gases': 1,
                          'disordered systems and neural networks': 2}),
             (2003,
              2): defaultdict(int,
                         {'statistical mechanics': 34,
                          'superconductivity': 30,
                          'mesoscale and nanoscale physics': 26,
                          'condensed matter': 4,
                          'soft condensed matter': 15,
                          'materials science': 11,
                          'other condensed matter': 1,
                          'strongly correlated electrons': 22,
                          'disordered systems and neural networks': 4,
                          'quantum physics': 1}),
             (2001,
              4): defaultdict(int,
                         {'materials science': 7,
                          'statistical mechanics': 30,
                          'superconductivity': 30,
                          'mesoscale and nanoscale physics': 17,
                          'strongly correlated electrons': 12,
                          'soft condensed matter': 9,
                          'quantum physics': 1,
                          'condensed matter': 1}),
             (1999,
              3): defaultdict(int,
                         {'statistical mechanics': 32,
                          'strongly correlated electrons': 18,
                          'materials science': 8,
                          'high energy physics - theory': 1,
                          'soft condensed matter': 8,
                          'superconductivity': 18,
                          'mesoscale and nanoscale physics': 14,
                          'condensed matter': 2}),
             (2012,
              9): defaultdict(int,
                         {'mesoscale and nanoscale physics': 41,
                          'other condensed matter': 1,
                          'statistical mechanics': 48,
                          'strongly correlated electrons': 20,
                          'materials science': 44,
                          'superconductivity': 24,
                          'quantum physics': 7,
                          'soft condensed matter': 20,
                          'mathematical physics': 3,
                          'quantum gases': 13,
                          'disordered systems and neural networks': 1}),
             (2000,
              12): defaultdict(int,
                         {'statistical mechanics': 33,
                          'strongly correlated electrons': 17,
                          'mesoscale and nanoscale physics': 15,
                          'soft condensed matter': 11,
                          'superconductivity': 15,
                          'disordered systems and neural networks': 1,
                          'high energy physics - lattice': 1,
                          'condensed matter': 2,
                          'quantum physics': 2,
                          'materials science': 4}),
             (2005,
              6): defaultdict(int,
                         {'materials science': 27,
                          'other condensed matter': 11,
                          'soft condensed matter': 18,
                          'superconductivity': 17,
                          'statistical mechanics': 27,
                          'strongly correlated electrons': 32,
                          'mesoscale and nanoscale physics': 31,
                          'disordered systems and neural networks': 3,
                          'quantum physics': 8,
                          'quantum gases': 2}),
             (2002,
              4): defaultdict(int,
                         {'soft condensed matter': 8,
                          'strongly correlated electrons': 15,
                          'statistical mechanics': 38,
                          'superconductivity': 18,
                          'condensed matter': 2,
                          'materials science': 14,
                          'mesoscale and nanoscale physics': 13,
                          'disordered systems and neural networks': 3,
                          'high energy physics - phenomenology': 1,
                          'high energy physics - theory': 1}),
             (2002,
              6): defaultdict(int,
                         {'statistical mechanics': 37,
                          'mesoscale and nanoscale physics': 25,
                          'strongly correlated electrons': 24,
                          'soft condensed matter': 8,
                          'materials science': 11,
                          'disordered systems and neural networks': 5,
                          'quantum physics': 3,
                          'superconductivity': 10,
                          'condensed matter': 2}),
             (2000,
              11): defaultdict(int,
                         {'statistical mechanics': 42,
                          'strongly correlated electrons': 14,
                          'superconductivity': 16,
                          'quantum gases': 3,
                          'mesoscale and nanoscale physics': 17,
                          'disordered systems and neural networks': 2,
                          'soft condensed matter': 3,
                          'condensed matter': 2,
                          'materials science': 8}),
             (2010,
              2): defaultdict(int,
                         {'statistical mechanics': 26,
                          'materials science': 42,
                          'strongly correlated electrons': 24,
                          'superconductivity': 27,
                          'soft condensed matter': 16,
                          'mesoscale and nanoscale physics': 52,
                          'quantum gases': 9,
                          'quantum physics': 5,
                          'disordered systems and neural networks': 2}),
             (1999,
              5): defaultdict(int,
                         {'statistical mechanics': 33,
                          'mesoscale and nanoscale physics': 18,
                          'superconductivity': 15,
                          'strongly correlated electrons': 14,
                          'condensed matter': 2,
                          'materials science': 5,
                          'soft condensed matter': 5,
                          'disordered systems and neural networks': 1}),
             (2001,
              3): defaultdict(int,
                         {'superconductivity': 30,
                          'statistical mechanics': 39,
                          'soft condensed matter': 8,
                          'strongly correlated electrons': 20,
                          'materials science': 8,
                          'high energy physics - theory': 2,
                          'mesoscale and nanoscale physics': 15,
                          'condensed matter': 3,
                          'disordered systems and neural networks': 5,
                          'quantum physics': 1,
                          'other condensed matter': 1}),
             (2001,
              1): defaultdict(int,
                         {'condensed matter': 4,
                          'mesoscale and nanoscale physics': 13,
                          'disordered systems and neural networks': 3,
                          'statistical mechanics': 31,
                          'soft condensed matter': 11,
                          'materials science': 7,
                          'strongly correlated electrons': 22,
                          'superconductivity': 9,
                          'high energy physics - theory': 1}),
             (2009,
              8): defaultdict(int,
                         {'mesoscale and nanoscale physics': 44,
                          'materials science': 23,
                          'strongly correlated electrons': 22,
                          'quantum gases': 9,
                          'statistical mechanics': 23,
                          'superconductivity': 19,
                          'physics - physics and society': 1,
                          'soft condensed matter': 9,
                          'quantum physics': 1}),
             (2006,
              4): defaultdict(int,
                         {'statistical mechanics': 32,
                          'superconductivity': 18,
                          'mesoscale and nanoscale physics': 26,
                          'materials science': 21,
                          'soft condensed matter': 12,
                          'strongly correlated electrons': 24,
                          'other condensed matter': 7,
                          'quantum gases': 1,
                          'disordered systems and neural networks': 5}),
             (2001,
              2): defaultdict(int,
                         {'strongly correlated electrons': 26,
                          'statistical mechanics': 31,
                          'superconductivity': 21,
                          'mesoscale and nanoscale physics': 12,
                          'materials science': 8,
                          'soft condensed matter': 6,
                          'disordered systems and neural networks': 2,
                          'quantum physics': 1,
                          'condensed matter': 2}),
             (2009,
              6): defaultdict(int,
                         {'mesoscale and nanoscale physics': 37,
                          'statistical mechanics': 28,
                          'materials science': 28,
                          'strongly correlated electrons': 33,
                          'soft condensed matter': 16,
                          'quantum gases': 16,
                          'superconductivity': 14,
                          'quantum physics': 4,
                          'nonlinear sciences - chaotic dynamics': 1,
                          'disordered systems and neural networks': 1}),
             (2002,
              10): defaultdict(int,
                         {'disordered systems and neural networks': 6,
                          'statistical mechanics': 43,
                          'soft condensed matter': 9,
                          'mesoscale and nanoscale physics': 17,
                          'other condensed matter': 2,
                          'materials science': 21,
                          'strongly correlated electrons': 23,
                          'superconductivity': 23,
                          'condensed matter': 3,
                          'quantum physics': 1}),
             (1993,
              12): defaultdict(int,
                         {'condensed matter': 28, 'materials science': 1}),
             (2011,
              2): defaultdict(int,
                         {'statistical mechanics': 38,
                          'materials science': 47,
                          'soft condensed matter': 19,
                          'mesoscale and nanoscale physics': 42,
                          'superconductivity': 30,
                          'quantum physics': 5,
                          'quantum gases': 10,
                          'strongly correlated electrons': 24,
                          'disordered systems and neural networks': 5,
                          'mathematical physics': 1,
                          'high energy physics - theory': 1}),
             (2009,
              5): defaultdict(int,
                         {'statistical mechanics': 33,
                          'strongly correlated electrons': 28,
                          'materials science': 25,
                          'mesoscale and nanoscale physics': 35,
                          'soft condensed matter': 14,
                          'superconductivity': 24,
                          'quantum gases': 6,
                          'quantum physics': 5,
                          'disordered systems and neural networks': 4,
                          'high energy physics - theory': 1,
                          'physics - physics and society': 1,
                          'other condensed matter': 1}),
             (2005,
              3): defaultdict(int,
                         {'mesoscale and nanoscale physics': 36,
                          'superconductivity': 26,
                          'statistical mechanics': 48,
                          'soft condensed matter': 11,
                          'materials science': 31,
                          'nonlinear sciences - chaotic dynamics': 1,
                          'strongly correlated electrons': 24,
                          'disordered systems and neural networks': 2,
                          'other condensed matter': 4,
                          'quantum gases': 1}),
             (2010,
              1): defaultdict(int,
                         {'materials science': 34,
                          'statistical mechanics': 37,
                          'mesoscale and nanoscale physics': 46,
                          'strongly correlated electrons': 23,
                          'soft condensed matter': 12,
                          'superconductivity': 34,
                          'quantum gases': 13,
                          'quantum physics': 6,
                          'disordered systems and neural networks': 2}),
             (2002,
              2): defaultdict(int,
                         {'strongly correlated electrons': 17,
                          'superconductivity': 17,
                          'statistical mechanics': 35,
                          'mesoscale and nanoscale physics': 18,
                          'soft condensed matter': 10,
                          'materials science': 10,
                          'quantum physics': 1,
                          'condensed matter': 1,
                          'quantum gases': 1,
                          'disordered systems and neural networks': 1,
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             (2004,
              6): defaultdict(int,
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                          'mesoscale and nanoscale physics': 39,
                          'strongly correlated electrons': 36,
                          'soft condensed matter': 8,
                          'statistical mechanics': 28,
                          'other condensed matter': 10,
                          'materials science': 22,
                          'quantum physics': 2,
                          'disordered systems and neural networks': 4,
                          'quantum gases': 1}),
             (1995,
              7): defaultdict(int,
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             (2009,
              1): defaultdict(int,
                         {'strongly correlated electrons': 18,
                          'materials science': 31,
                          'superconductivity': 19,
                          'statistical mechanics': 18,
                          'mesoscale and nanoscale physics': 27,
                          'quantum gases': 6,
                          'disordered systems and neural networks': 3,
                          'soft condensed matter': 13,
                          'quantum physics': 2,
                          'other condensed matter': 1}),
             (2007,
              6): defaultdict(int,
                         {'strongly correlated electrons': 31,
                          'statistical mechanics': 29,
                          'mesoscale and nanoscale physics': 33,
                          'superconductivity': 20,
                          'materials science': 30,
                          'other condensed matter': 15,
                          'soft condensed matter': 14,
                          'disordered systems and neural networks': 5,
                          'quantum physics': 2,
                          'quantum gases': 1}),
             (2003,
              10): defaultdict(int,
                         {'materials science': 19,
                          'strongly correlated electrons': 28,
                          'statistical mechanics': 43,
                          'soft condensed matter': 12,
                          'mesoscale and nanoscale physics': 37,
                          'high energy physics - theory': 1,
                          'superconductivity': 18,
                          'disordered systems and neural networks': 6,
                          'other condensed matter': 4,
                          'quantum gases': 1}),
             (1995, 11): defaultdict(int, {'condensed matter': 30}),
             (1996, 2): defaultdict(int, {'condensed matter': 39}),
             (1994,
              6): defaultdict(int,
                         {'condensed matter': 25, 'materials science': 1}),
             (2008,
              2): defaultdict(int,
                         {'superconductivity': 15,
                          'other condensed matter': 1,
                          'strongly correlated electrons': 20,
                          'soft condensed matter': 12,
                          'statistical mechanics': 35,
                          'mesoscale and nanoscale physics': 29,
                          'quantum gases': 2,
                          'materials science': 14,
                          'disordered systems and neural networks': 2,
                          'quantum physics': 4}),
             (1999,
              12): defaultdict(int,
                         {'statistical mechanics': 33,
                          'mesoscale and nanoscale physics': 16,
                          'superconductivity': 17,
                          'strongly correlated electrons': 25,
                          'high energy physics - lattice': 1,
                          'high energy physics - theory': 2,
                          'materials science': 6,
                          'soft condensed matter': 2,
                          'quantum gases': 1,
                          'disordered systems and neural networks': 3,
                          'condensed matter': 1}),
             (2014,
              1): defaultdict(int,
                         {'superconductivity': 15,
                          'statistical mechanics': 33,
                          'mesoscale and nanoscale physics': 46,
                          'materials science': 68,
                          'soft condensed matter': 21,
                          'quantum physics': 9,
                          'strongly correlated electrons': 29,
                          'quantum gases': 7,
                          'other condensed matter': 1}),
             (2006,
              12): defaultdict(int,
                         {'mesoscale and nanoscale physics': 32,
                          'other condensed matter': 8,
                          'materials science': 31,
                          'superconductivity': 15,
                          'strongly correlated electrons': 19,
                          'statistical mechanics': 35,
                          'soft condensed matter': 9,
                          'quantum physics': 4,
                          'disordered systems and neural networks': 1,
                          'quantum gases': 1}),
             (1996,
              11): defaultdict(int,
                         {'condensed matter': 53,
                          'superconductivity': 1,
                          'strongly correlated electrons': 2,
                          'materials science': 2,
                          'mesoscale and nanoscale physics': 2}),
             (2007,
              2): defaultdict(int,
                         {'materials science': 28,
                          'mesoscale and nanoscale physics': 29,
                          'superconductivity': 19,
                          'strongly correlated electrons': 18,
                          'statistical mechanics': 20,
                          'quantum physics': 1,
                          'soft condensed matter': 11,
                          'other condensed matter': 7,
                          'disordered systems and neural networks': 3,
                          'quantum gases': 1,
                          'physics - biological physics': 1,
                          'high energy physics - theory': 1}),
             (1992, 12): defaultdict(int, {'condensed matter': 11}),
             (1997,
              8): defaultdict(int,
                         {'superconductivity': 8,
                          'statistical mechanics': 16,
                          'disordered systems and neural networks': 3,
                          'mesoscale and nanoscale physics': 8,
                          'strongly correlated electrons': 6,
                          'condensed matter': 2,
                          'materials science': 2,
                          'high energy physics - theory': 1,
                          'soft condensed matter': 2}),
             (1994, 3): defaultdict(int, {'condensed matter': 24}),
             (2007,
              7): defaultdict(int,
                         {'other condensed matter': 8,
                          'mesoscale and nanoscale physics': 39,
                          'statistical mechanics': 30,
                          'materials science': 32,
                          'strongly correlated electrons': 27,
                          'disordered systems and neural networks': 3,
                          'superconductivity': 17,
                          'quantum gases': 3,
                          'soft condensed matter': 14,
                          'quantum physics': 1,
                          'high energy physics - theory': 1}),
             (2005,
              1): defaultdict(int,
                         {'statistical mechanics': 47,
                          'strongly correlated electrons': 22,
                          'superconductivity': 16,
                          'mesoscale and nanoscale physics': 27,
                          'materials science': 22,
                          'soft condensed matter': 10,
                          'other condensed matter': 3,
                          'quantum physics': 1,
                          'disordered systems and neural networks': 3,
                          'high energy physics - theory': 1}),
             (1993, 1): defaultdict(int, {'condensed matter': 14}),
             (1996,
              12): defaultdict(int,
                         {'condensed matter': 43,
                          'materials science': 1,
                          'mesoscale and nanoscale physics': 2}),
             (1998,
              6): defaultdict(int,
                         {'strongly correlated electrons': 11,
                          'soft condensed matter': 5,
                          'statistical mechanics': 31,
                          'mesoscale and nanoscale physics': 10,
                          'materials science': 8,
                          'superconductivity': 11,
                          'disordered systems and neural networks': 2,
                          'high energy physics - lattice': 1,
                          'condensed matter': 1}),
             (2006,
              11): defaultdict(int,
                         {'strongly correlated electrons': 34,
                          'superconductivity': 18,
                          'materials science': 30,
                          'statistical mechanics': 37,
                          'mesoscale and nanoscale physics': 31,
                          'soft condensed matter': 9,
                          'disordered systems and neural networks': 6,
                          'other condensed matter': 4,
                          'quantum physics': 1}),
             (2006,
              1): defaultdict(int,
                         {'materials science': 20,
                          'superconductivity': 16,
                          'strongly correlated electrons': 27,
                          'statistical mechanics': 29,
                          'mesoscale and nanoscale physics': 32,
                          'other condensed matter': 6,
                          'soft condensed matter': 9,
                          'disordered systems and neural networks': 1,
                          'high energy physics - theory': 1}),
             (1994,
              12): defaultdict(int,
                         {'condensed matter': 28, 'materials science': 1}),
             (2006,
              2): defaultdict(int,
                         {'statistical mechanics': 36,
                          'mesoscale and nanoscale physics': 27,
                          'materials science': 26,
                          'strongly correlated electrons': 22,
                          'superconductivity': 17,
                          'quantum gases': 1,
                          'disordered systems and neural networks': 3,
                          'soft condensed matter': 5,
                          'other condensed matter': 3,
                          'high energy physics - theory': 1}),
             (1998,
              2): defaultdict(int,
                         {'strongly correlated electrons': 18,
                          'superconductivity': 7,
                          'statistical mechanics': 21,
                          'mesoscale and nanoscale physics': 8,
                          'disordered systems and neural networks': 3,
                          'soft condensed matter': 1,
                          'condensed matter': 2,
                          'materials science': 2,
                          'high energy physics - theory': 1}),
             (1997,
              5): defaultdict(int,
                         {'mesoscale and nanoscale physics': 10,
                          'statistical mechanics': 24,
                          'strongly correlated electrons': 15,
                          'superconductivity': 9,
                          'condensed matter': 2,
                          'materials science': 6,
                          'high energy physics - theory': 1,
                          'other condensed matter': 1,
                          'disordered systems and neural networks': 1}),
             (1997,
              7): defaultdict(int,
                         {'mesoscale and nanoscale physics': 15,
                          'superconductivity': 6,
                          'disordered systems and neural networks': 4,
                          'soft condensed matter': 4,
                          'condensed matter': 2,
                          'statistical mechanics': 23,
                          'materials science': 5,
                          'strongly correlated electrons': 12}),
             (2005,
              2): defaultdict(int,
                         {'superconductivity': 19,
                          'strongly correlated electrons': 24,
                          'disordered systems and neural networks': 3,
                          'statistical mechanics': 28,
                          'mesoscale and nanoscale physics': 32,
                          'other condensed matter': 9,
                          'materials science': 18,
                          'soft condensed matter': 8,
                          'quantum physics': 3,
                          'quantum gases': 1}),
             (1997,
              2): defaultdict(int,
                         {'strongly correlated electrons': 18,
                          'condensed matter': 1,
                          'statistical mechanics': 6,
                          'superconductivity': 12,
                          'mesoscale and nanoscale physics': 10,
                          'materials science': 4,
                          'soft condensed matter': 1}),
             (1996,
              6): defaultdict(int,
                         {'condensed matter': 50, 'materials science': 1}),
             (1996,
              10): defaultdict(int,
                         {'condensed matter': 53,
                          'superconductivity': 3,
                          'high energy physics - theory': 1,
                          'materials science': 3}),
             (1996,
              7): defaultdict(int,
                         {'condensed matter': 38,
                          'materials science': 3,
                          'mesoscale and nanoscale physics': 1}),
             (1992, 11): defaultdict(int, {'condensed matter': 3}),
             (1998,
              11): defaultdict(int,
                         {'mesoscale and nanoscale physics': 15,
                          'statistical mechanics': 25,
                          'materials science': 6,
                          'strongly correlated electrons': 16,
                          'soft condensed matter': 2,
                          'condensed matter': 3,
                          'superconductivity': 14,
                          'high energy physics - theory': 2,
                          'disordered systems and neural networks': 2}),
             (2000,
              3): defaultdict(int,
                         {'statistical mechanics': 32,
                          'soft condensed matter': 6,
                          'condensed matter': 2,
                          'superconductivity': 20,
                          'mesoscale and nanoscale physics': 20,
                          'strongly correlated electrons': 17,
                          'materials science': 7,
                          'disordered systems and neural networks': 3,
                          'other condensed matter': 1}),
             (1995, 5): defaultdict(int, {'condensed matter': 30}),
             (1997,
              1): defaultdict(int,
                         {'strongly correlated electrons': 11,
                          'disordered systems and neural networks': 5,
                          'mesoscale and nanoscale physics': 13,
                          'materials science': 2,
                          'superconductivity': 3,
                          'statistical mechanics': 13,
                          'soft condensed matter': 1,
                          'condensed matter': 2}),
             (1992, 4): defaultdict(int, {'condensed matter': 3}),
             (1994,
              9): defaultdict(int,
                         {'condensed matter': 27, 'materials science': 1}),
             (1994, 2): defaultdict(int, {'condensed matter': 28}),
             (1996,
              8): defaultdict(int,
                         {'condensed matter': 41,
                          'materials science': 1,
                          'mesoscale and nanoscale physics': 1}),
             (1995, 6): defaultdict(int, {'condensed matter': 30}),
             (1994, 11): defaultdict(int, {'condensed matter': 33}),
             (1995,
              1): defaultdict(int,
                         {'condensed matter': 37, 'materials science': 1}),
             (1997,
              9): defaultdict(int,
                         {'statistical mechanics': 21,
                          'strongly correlated electrons': 20,
                          'mesoscale and nanoscale physics': 10,
                          'condensed matter': 3,
                          'materials science': 4,
                          'soft condensed matter': 5,
                          'superconductivity': 6,
                          'disordered systems and neural networks': 1}),
             (1994, 5): defaultdict(int, {'condensed matter': 22}),
             (1992, 8): defaultdict(int, {'condensed matter': 9}),
             (1994, 4): defaultdict(int, {'condensed matter': 25}),
             (1994, 10): defaultdict(int, {'condensed matter': 31}),
             (1994, 8): defaultdict(int, {'condensed matter': 33}),
             (1993, 2): defaultdict(int, {'condensed matter': 7}),
             (1996, 3): defaultdict(int, {'condensed matter': 51}),
             (1994,
              7): defaultdict(int,
                         {'condensed matter': 31,
                          'high energy physics - lattice': 1}),
             (1992, 10): defaultdict(int, {'condensed matter': 6}),
             (1993, 3): defaultdict(int, {'condensed matter': 13}),
             (1993, 9): defaultdict(int, {'condensed matter': 13}),
             (1993, 4): defaultdict(int, {'condensed matter': 12}),
             (1993, 8): defaultdict(int, {'condensed matter': 10}),
             (1992, 5): defaultdict(int, {'condensed matter': 6}),
             (1993,
              5): defaultdict(int,
                         {'condensed matter': 9, 'materials science': 1}),
             (1992, 6): defaultdict(int, {'condensed matter': 4})})

Name		Name	Last commit message	Last commit date
Latest commit History 16 Commits
Helpers		Helpers
rubicon-root/article-classification		rubicon-root/article-classification
.DS_Store		.DS_Store
Calc_MSE.py		Calc_MSE.py
Prediction_Alg.py		Prediction_Alg.py
README.md		README.md
formatted_output.csv		formatted_output.csv
model.ipynb		model.ipynb
output.csv		output.csv
output2.csv		output2.csv
predictions.csv		predictions.csv

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Predicting Subjects From Articles Supervised

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Predicting Subjects From Articles Supervised

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