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eda.html
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eda.html
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<h1 class="title">Module <code>ktrain.text.eda</code></h1>
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<section id="section-intro">
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">from ..imports import *
from .. import utils as U
from . import textutils as TU
from . import preprocessor as pp
import time
class TopicModel():
def __init__(self,texts=None, n_topics=None, n_features=10000,
min_df=5, max_df=0.5, stop_words='english',
model_type='lda',
lda_max_iter=5, lda_mode='online',
token_pattern=None, verbose=1,
hyperparam_kwargs=None
):
"""
Fits a topic model to documents in <texts>.
Example:
tm = ktrain.text.get_topic_model(docs, n_topics=20,
n_features=1000, min_df=2, max_df=0.95)
Args:
texts (list of str): list of texts
n_topics (int): number of topics.
If None, n_topics = min{400, sqrt[# documents/2]})
n_features (int): maximum words to consider
max_df (float): words in more than max_df proportion of docs discarded
stop_words (str or list): either 'english' for built-in stop words or
a list of stop words to ignore
model_type(str): type of topic model to fit. One of {'lda', 'nmf'}. Default:'lda'
lda_max_iter (int): maximum iterations for 'lda'. 5 is default if using lda_mode='online'.
If lda_mode='batch', this should be increased (e.g., 1500).
Ignored if model_type != 'lda'
lda_mode (str): one of {'online', 'batch'}. Ignored if model_type !='lda'
token_pattern(str): regex pattern to use to tokenize documents.
verbose(bool): verbosity
"""
self.verbose=verbose
# estimate n_topics
if n_topics is None:
if texts is None:
raise ValueError('If n_topics is None, texts must be supplied')
estimated = max(1, int(math.floor(math.sqrt(len(texts) / 2))))
n_topics = min(400, estimated)
print('n_topics automatically set to %s' % (n_topics))
# train model
if texts is not None:
(model, vectorizer) = self.train(texts, model_type=model_type,
n_topics=n_topics, n_features=n_features,
min_df = min_df, max_df = max_df,
stop_words=stop_words,
lda_max_iter=lda_max_iter, lda_mode=lda_mode,
token_pattern=token_pattern,
hyperparam_kwargs=hyperparam_kwargs)
else:
vectorizer = None
model = None
# save model and vectorizer and hyperparameter settings
self.vectorizer = vectorizer
self.model = model
self.n_topics = n_topics
self.n_features = n_features
if verbose: print('done.')
# these variables are set by self.build():
self.topic_dict = None
self.doc_topics = None
self.bool_array = None
self.scorer = None # set by self.train_scorer()
self.recommender = None # set by self.train_recommender()
return
def train(self,texts, model_type='lda', n_topics=None, n_features=10000,
min_df=5, max_df=0.5, stop_words='english',
lda_max_iter=5, lda_mode='online',
token_pattern=None, hyperparam_kwargs=None):
"""
Fits a topic model to documents in <texts>.
Example:
tm = ktrain.text.get_topic_model(docs, n_topics=20,
n_features=1000, min_df=2, max_df=0.95)
Args:
texts (list of str): list of texts
n_topics (int): number of topics.
If None, n_topics = min{400, sqrt[# documents/2]})
n_features (int): maximum words to consider
max_df (float): words in more than max_df proportion of docs discarded
stop_words (str or list): either 'english' for built-in stop words or
a list of stop words to ignore
lda_max_iter (int): maximum iterations for 'lda'. 5 is default if using lda_mode='online'.
If lda_mode='batch', this should be increased (e.g., 1500).
Ignored if model_type != 'lda'
lda_mode (str): one of {'online', 'batch'}. Ignored of model_type !='lda'
token_pattern(str): regex pattern to use to tokenize documents.
If None, a default tokenizer will be used
hyperparam_kwargs(dict): hyperparameters for LDA/NMF
Keys in this dict can be any of the following:
alpha: alpha for LDA default: 5./n_topics
beta: beta for LDA. default:0.01
nmf_alpha: alpha for NMF. default:0
l1_ratio: l1_ratio for NMF. default: 0
ngram_range: whether to consider bigrams, trigrams. default: (1,1)
Returns:
tuple: (model, vectorizer)
"""
if hyperparam_kwargs is None:
hyperparam_kwargs = {}
alpha = hyperparam_kwargs.get('alpha', 5.0 / n_topics)
beta = hyperparam_kwargs.get('beta', 0.01)
nmf_alpha = hyperparam_kwargs.get('nmf_alpha', 0)
l1_ratio = hyperparam_kwargs.get('l1_ratio', 0)
ngram_range = hyperparam_kwargs.get('ngram_range', (1,1))
# adjust defaults based on language detected
if texts is not None:
lang = TU.detect_lang(texts)
if lang != 'en':
stopwords = None if stop_words=='english' else stop_words
token_pattern = r'(?u)\b\w+\b' if token_pattern is None else token_pattern
if pp.is_nospace_lang(lang):
text_list = []
for t in texts:
text_list.append(' '.join(jieba.cut(t, HMM=False)))
texts = text_list
if self.verbose: print('lang: %s' % (lang))
# preprocess texts
if self.verbose: print('preprocessing texts...')
if token_pattern is None: token_pattern = TU.DEFAULT_TOKEN_PATTERN
#if token_pattern is None: token_pattern = r'(?u)\b\w\w+\b'
vectorizer = CountVectorizer(max_df=max_df, min_df=min_df,
max_features=n_features, stop_words=stop_words,
token_pattern=token_pattern, ngram_range=ngram_range)
x_train = vectorizer.fit_transform(texts)
# fit model
if self.verbose: print('fitting model...')
if model_type == 'lda':
model = LatentDirichletAllocation(n_components=n_topics, max_iter=lda_max_iter,
learning_method=lda_mode, learning_offset=50.,
doc_topic_prior=alpha,
topic_word_prior=beta,
verbose=self.verbose, random_state=0)
elif model_type == 'nmf':
model = NMF(
n_components=n_topics,
max_iter=lda_max_iter,
verbose=self.verbose,
alpha=nmf_alpha,
l1_ratio=l1_ratio,
random_state=0)
else:
raise ValueError("unknown model type:", str(model_type))
model.fit(x_train)
# save model and vectorizer and hyperparameter settings
return (model, vectorizer)
@property
def topics(self):
"""
convenience method/property
"""
return self.get_topics()
def get_document_topic_distribution(self):
"""
Gets the document-topic distribution.
Each row is a document and each column is a topic
The output of this method is equivalent to invoking get_doctopics with no arguments.
"""
self._check_build()
return self.doc_topics
def get_sorted_docs(self, topic_id):
"""
Returns all docs sorted by relevance to <topic_id>.
Unlike get_docs, this ranks documents by the supplied topic_id rather
than the topic_id to which document is most relevant.
"""
docs = self.get_docs()
d = {}
for doc in docs: d[doc['doc_id']] = doc
m = self.get_document_topic_distribution()
doc_ids = (-m[:,topic_id]).argsort()
return [d[doc_id] for doc_id in doc_ids]
def get_word_weights(self, topic_id, n_words=100):
"""
Returns a list tuples of the form: (word, weight) for given topic_id.
The weight can be interpreted as the number of times word was assigned to topic with given topic_id.
REFERENCE: https://stackoverflow.com/a/48890889/13550699
Args:
topic_id(int): topic ID
n_words=int): number of top words
"""
self._check_model()
if topic_id+1 > len(self.model.components_):
raise ValueError('topic_id must be less than %s' % (len(self.model.components_)))
feature_names = self.vectorizer.get_feature_names()
word_probs = self.model.components_[topic_id]
word_ids = [i for i in word_probs.argsort()[:-n_words - 1:-1]]
words = [feature_names[i] for i in word_ids]
probs = [word_probs[i] for i in word_ids]
return list( zip(words, probs) )
def get_topics(self, n_words=10, as_string=True):
"""
Returns a list of discovered topics
Args:
n_words(int): number of words to use in topic summary
as_string(bool): If True, each summary is a space-delimited string instead of list of words
"""
self._check_model()
feature_names = self.vectorizer.get_feature_names()
topic_summaries = []
for topic_idx, topic in enumerate(self.model.components_):
summary = [feature_names[i] for i in topic.argsort()[:-n_words - 1:-1]]
if as_string: summary = " ".join(summary)
topic_summaries.append(summary)
return topic_summaries
def print_topics(self, n_words=10, show_counts=False):
"""
print topics
n_words(int): number of words to describe each topic
show_counts(bool): If True, print topics with document counts, where
the count is the number of documents with that topic as primary.
"""
topics = self.get_topics(n_words=n_words, as_string=True)
if show_counts:
self._check_build()
topic_counts = sorted([ (k, topics[k], len(v)) for k,v in self.topic_dict.items()],
key=lambda kv:kv[-1], reverse=True)
for (idx, topic, count) in topic_counts:
print("topic:%s | count:%s | %s" %(idx, count, topic))
else:
for i, t in enumerate(topics):
print('topic %s | %s' % (i, t))
return
def build(self, texts, threshold=None):
"""
Builds the document-topic distribution showing the topic probability distirbution
for each document in <texts> with respect to the learned topic space.
Args:
texts (list of str): list of text documents
threshold (float): If not None, documents with whose highest topic probability
is less than threshold are filtered out.
"""
if threshold is not None:
doc_topics, bool_array = self.predict(texts, threshold=threshold)
else:
doc_topics = self.predict(texts)
bool_array = np.array([True] * len(texts))
self.doc_topics = doc_topics
self.bool_array = bool_array
texts = [text for i, text in enumerate(texts) if bool_array[i]]
self.topic_dict = self._rank_documents(texts, doc_topics=doc_topics)
return
def filter(self, lst):
"""
The build method may prune documents based on threshold.
This method prunes other lists based on how build pruned documents.
This is useful to filter lists containing metadata associated with documents
for use with visualize_documents.
Args:
lst(list): a list of data
Returns:
list: a filtered list of data based on how build filtered the documents
"""
if len(lst) != self.bool_array.shape[0]:
raise ValueError('Length of lst is not consistent with the number of documents ' +
'supplied to get_topic_model')
arr = np.array(lst)
return list(arr[self.bool_array])
def get_docs(self, topic_ids=[], doc_ids=[], rank=False):
"""
Returns document entries for supplied topic_ids.
Documents returned are those whose primary topic is topic with given topic_id
Args:
topic_ids(list of ints): list of topid IDs where each id is in the range
of range(self.n_topics).
doc_ids (list of ints): list of document IDs where each id is an index
into self.doctopics
rank(bool): If True, the list is sorted first by topic_id (ascending)
and then ty topic probability (descending).
Otherwise, list is sorted by doc_id (i.e., the order
of texts supplied to self.build (which is the order of self.doc_topics).
Returns:
list of dicts: list of dicts with keys:
'text': text of document
'doc_id': ID of document
'topic_proba': topic probability (or score)
'topic_id': ID of topic
"""
self._check_build()
if not topic_ids:
topic_ids = list(range(self.n_topics))
result_texts = []
for topic_id in topic_ids:
if topic_id not in self.topic_dict: continue
texts = [{'text':tup[0], 'doc_id':tup[1], 'topic_proba':tup[2], 'topic_id':topic_id} for tup in self.topic_dict[topic_id]
if not doc_ids or tup[1] in doc_ids]
result_texts.extend(texts)
if not rank:
result_texts = sorted(result_texts, key=lambda x:x['doc_id'])
return result_texts
def get_doctopics(self, topic_ids=[], doc_ids=[]):
"""
Returns a topic probability distribution for documents
with primary topic that is one of <topic_ids> and with doc_id in <doc_ids>.
If no topic_ids or doc_ids are provided, then topic distributions for all documents
are returned (which equivalent to the output of get_document_topic_distribution).
Args:
topic_ids(list of ints): list of topid IDs where each id is in the range
of range(self.n_topics).
doc_ids (list of ints): list of document IDs where each id is an index
into self.doctopics
Returns:
np.ndarray: Each row is the topic probability distribution of a document.
Array is sorted in the order returned by self.get_docs.
"""
docs = self.get_docs(topic_ids=topic_ids, doc_ids=doc_ids)
return np.array([self.doc_topics[idx] for idx in [x['doc_id'] for x in docs]])
def get_texts(self, topic_ids=[]):
"""
Returns texts for documents
with primary topic that is one of <topic_ids>
Args:
topic_ids(list of ints): list of topic IDs
Returns:
list of str
"""
if not topic_ids: topic_ids = list(range(self.n_topics))
docs = self.get_docs(topic_ids)
return [x[0] for x in docs]
def predict(self, texts, threshold=None, harden=False):
"""
Args:
texts (list of str): list of texts
threshold (float): If not None, documents with maximum topic scores
less than <threshold> are filtered out
harden(bool): If True, each document is assigned to a single topic for which
it has the highest score
Returns:
if threshold is None:
np.ndarray: topic distribution for each text document
else:
(np.ndarray, np.ndarray): topic distribution and boolean array
"""
self._check_model()
transformed_texts = self.vectorizer.transform(texts)
X_topics = self.model.transform(transformed_texts)
#if self.model_type == 'nmf':
#scores = np.matrix(X_topics)
#scores_normalized= scores/scores.sum(axis=1)
#X_topics = scores_normalized
_idx = np.array([True] * len(texts))
if threshold is not None:
_idx = np.amax(X_topics, axis=1) > threshold # idx of doc that above the threshold
_idx = np.array(_idx)
X_topics = X_topics[_idx]
if harden: X_topics = self._harden_topics(X_topics)
if threshold is not None:
return (X_topics, _idx)
else:
return X_topics
def visualize_documents(self, texts=None, doc_topics=None,
width=700, height=700, point_size=5, title='Document Visualization',
extra_info={},
colors=None,
filepath=None,):
"""
Generates a visualization of a set of documents based on model.
If <texts> is supplied, raw documents will be first transformed into document-topic
matrix. If <doc_topics> is supplied, then this will be used for visualization instead.
Args:
texts(list of str): list of document texts. Mutually-exclusive with <doc_topics>
doc_topics(ndarray): pre-computed topic distribution for each document in texts.
Mutually-exclusive with <texts>.
width(int): width of image
height(int): height of image
point_size(int): size of circles in plot
title(str): title of visualization
extra_info(dict of lists): A user-supplied information for each datapoint (attributes of the datapoint).
The keys are field names. The values are lists - each of which must
be the same number of elements as <texts> or <doc_topics>. These fields are displayed
when hovering over datapoints in the visualization.
colors(list of str): list of Hex color codes for each datapoint.
Length of list must match either len(texts) or doc_topics.shape[0]
filepath(str): Optional filepath to save the interactive visualization
"""
# error-checking
if texts is not None: length = len(texts)
else: length = doc_topics.shape[0]
if colors is not None and len(colors) != length:
raise ValueError('length of colors is not consistent with length of texts or doctopics')
if texts is not None and doc_topics is not None:
raise ValueError('texts is mutually-exclusive with doc_topics')
if texts is None and doc_topics is None:
raise ValueError('One of texts or doc_topics is required.')
if extra_info:
invalid_keys = ['x', 'y', 'topic', 'fill_color']
for k in extra_info.keys():
if k in invalid_keys:
raise ValueError('cannot use "%s" as key in extra_info' %(k))
lst = extra_info[k]
if len(lst) != length:
raise ValueError('texts and extra_info lists must be same size')
# check fo bokeh
try:
import bokeh.plotting as bp
from bokeh.plotting import save
from bokeh.models import HoverTool
from bokeh.io import output_notebook
except:
warnings.warn('visualize_documents method requires bokeh package: pip install bokeh')
return
# prepare data
if doc_topics is not None:
X_topics = doc_topics
else:
if self.verbose: print('transforming texts...', end='')
X_topics = self.predict(texts, harden=False)
if self.verbose: print('done.')
# reduce to 2-D
if self.verbose: print('reducing to 2 dimensions...', end='')
tsne_model = TSNE(n_components=2, verbose=self.verbose, random_state=0, angle=.99, init='pca')
tsne_lda = tsne_model.fit_transform(X_topics)
print('done.')
# get random colormap
colormap = U.get_random_colors(self.n_topics)
# generate inline visualization in Jupyter notebook
lda_keys = self._harden_topics(X_topics)
if colors is None: colors = colormap[lda_keys]
topic_summaries = self.get_topics(n_words=5)
os.environ["BOKEH_RESOURCES"]="inline"
output_notebook()
dct = {
'x':tsne_lda[:,0],
'y':tsne_lda[:, 1],
'topic':[topic_summaries[tid] for tid in lda_keys],
'fill_color':colors,}
tool_tups = [('index', '$index'),
('(x,y)','($x,$y)'),
('topic', '@topic')]
for k in extra_info.keys():
dct[k] = extra_info[k]
tool_tups.append((k, '@'+k))
source = bp.ColumnDataSource(data=dct)
hover = HoverTool( tooltips=tool_tups)
p = bp.figure(plot_width=width, plot_height=height,
tools=[hover, 'save', 'pan', 'wheel_zoom', 'box_zoom', 'reset'],
#tools="pan,wheel_zoom,box_zoom,reset,hover,previewsave",
title=title)
#plot_lda = bp.figure(plot_width=1400, plot_height=1100,
#title=title,
#tools="pan,wheel_zoom,box_zoom,reset,hover,previewsave",
#x_axis_type=None, y_axis_type=None, min_border=1)
p.circle('x', 'y', size=point_size, source=source, fill_color= 'fill_color')
bp.show(p)
if filepath is not None:
bp.output_file(filepath)
bp.save(p)
return
def train_recommender(self, n_neighbors=20, metric='minkowski', p=2):
"""
Trains a recommender that, given a single document, will return
documents in the corpus that are semantically similar to it.
Args:
n_neighbors (int):
Returns:
None
"""
from sklearn.neighbors import NearestNeighbors
rec = NearestNeighbors(n_neighbors=n_neighbors, metric=metric, p=p)
probs = self.get_doctopics()
rec.fit(probs)
self.recommender = rec
return
def recommend(self, text=None, doc_topic=None, n=5, n_neighbors=100):
"""
Given an example document, recommends documents similar to it
from the set of documents supplied to build().
Args:
texts(list of str): list of document texts. Mutually-exclusive with <doc_topics>
doc_topics(ndarray): pre-computed topic distribution for each document in texts.
Mutually-exclusive with <texts>.
n (int): number of recommendations to return
Returns:
list of tuples: each tuple is of the form:
(text, doc_id, topic_probability, topic_id)
"""
# error-checks
if text is not None and doc_topic is not None:
raise ValueError('text is mutually-exclusive with doc_topic')
if text is None and doc_topic is None:
raise ValueError('One of text or doc_topic is required.')
if text is not None and type(text) not in [str]:
raise ValueError('text must be a str ')
if doc_topic is not None and type(doc_topic) not in [np.ndarray]:
raise ValueError('doc_topic must be a np.ndarray')
if n > n_neighbors: n_neighbors = n
x_test = [doc_topic]
if text:
x_test = self.predict([text])
docs = self.get_docs()
indices = self.recommender.kneighbors(x_test, return_distance=False, n_neighbors=n_neighbors)
results = [doc for i, doc in enumerate(docs) if i in indices]
return results[:n]
def train_scorer(self, topic_ids=[], doc_ids=[], n_neighbors=20):
"""
Trains a scorer that can score documents based on similarity to a
seed set of documents represented by topic_ids and doc_ids.
NOTE: The score method currently employs the use of LocalOutLierFactor, which
means you should not try to score documents that were used in training. Only
new, unseen documents should be scored for similarity.
REFERENCE:
https://scikit-learn.org/stable/modules/generated/sklearn.neighbors.LocalOutlierFactor.html#sklearn.neighbors.LocalOutlierFactor
Args:
topic_ids(list of ints): list of topid IDs where each id is in the range
of range(self.n_topics). Documents associated
with these topic_ids will be used as seed set.
doc_ids (list of ints): list of document IDs where each id is an index
into self.doctopics. Documents associated
with these doc_ids will be used as seed set.
Returns:
None
"""
from sklearn.neighbors import LocalOutlierFactor
clf = LocalOutlierFactor(n_neighbors=n_neighbors, novelty=True, contamination=0.1)
probs = self.get_doctopics(topic_ids=topic_ids, doc_ids=doc_ids)
clf.fit(probs)
self.scorer = clf
return
def score(self, texts=None, doc_topics=None):
"""
Given a new set of documents (supplied as texts or doc_topics), the score method
uses a One-Class classifier to score documents based on similarity to a
seed set of documents (where seed set is computed by train_scorer() method).
Higher scores indicate a higher degree of similarity.
Positive values represent a binary decision of similar.
Negative values represent a binary decision of dissimlar.
In practice, negative scores closer to zer will also be simlar as One-Class
classifiers are more strict than traditional binary classifiers.
Documents with negative scores closer to zero are good candidates for
inclusion in a training set for binary classification (e.g., active labeling).
NOTE: The score method currently employs the use of LocalOutLierFactor, which
means you should not try to score documents that were used in training. Only
new, unseen documents should be scored for similarity.
Args:
texts(list of str): list of document texts. Mutually-exclusive with <doc_topics>
doc_topics(ndarray): pre-computed topic distribution for each document in texts.
Mutually-exclusive with <texts>.
Returns:
list of floats: larger values indicate higher degree of similarity
positive values indicate a binary decision of similar
negative values indicate binary decision of dissimilar
In practice, negative scores closer to zero will also
be similar as One-class classifiers are more strict
than traditional binary classifiers.
"""
# error-checks
if texts is not None and doc_topics is not None:
raise ValueError('texts is mutually-exclusive with doc_topics')
if texts is None and doc_topics is None:
raise ValueError('One of texts or doc_topics is required.')
if texts is not None and type(texts) not in [list, np.ndarray]:
raise ValueError('texts must be either a list or numpy ndarray')
if doc_topics is not None and type(doc_topics) not in [np.ndarray]:
raise ValueError('doc_topics must be a np.ndarray')
x_test = doc_topics
if texts:
x_test = self.predict(texts)
return self.scorer.decision_function(x_test)
def search(self, query, topic_ids=[], doc_ids=[], case_sensitive=False):
"""
search documents for query string.
Args:
query(str): the word or phrase to search
topic_ids(list of ints): list of topid IDs where each id is in the range
of range(self.n_topics).
doc_ids (list of ints): list of document IDs where each id is an index
into self.doctopics
case_sensitive(bool): If True, case sensitive search
"""
# setup pattern
if not case_sensitive: query = query.lower()
pattern = re.compile(r'\b%s\b' % query)
# retrive docs
docs = self.get_docs(topic_ids=topic_ids, doc_ids=doc_ids)
# search
mb = master_bar(range(1))
results = []
for i in mb:
for doc in progress_bar(docs, parent=mb):
text = doc['text']
if not case_sensitive: text = text.lower()
matches = pattern.findall(text)
if matches: results.append(doc)
if self.verbose: mb.write('done.')
return results
def _rank_documents(self,
texts,
doc_topics=None):
"""
Rank documents by topic score.
If topic_index is supplied, rank documents based on relevance to supplied topic.
Otherwise, rank all texts by their highest topic score (for any topic).
Args:
texts(list of str): list of document texts.
doc_topics(ndarray): pre-computed topic distribution for each document
If None, re-computed from texts.
Returns:
dict of lists: each element in list is a tuple of (doc_index, topic_index, score)
... where doc_index is an index into either texts
"""
if doc_topics is not None:
X_topics = doc_topics
else:
if self.verbose: print('transforming texts to topic space...')
X_topics = self.predict(texts)
topics = np.argmax(X_topics, axis=1)
scores = np.amax(X_topics, axis=1)
doc_ids = np.array([i for i, x in enumerate(texts)])
result = list(zip(texts, doc_ids, topics, scores))
if self.verbose: print('done.')
result = sorted(result, key=lambda x: x[-1], reverse=True)
result_dict = {}
for r in result:
text = r[0]
doc_id = r[1]
topic_id = r[2]
score = r[3]
lst = result_dict.get(topic_id, [])
lst.append((text, doc_id, score))
result_dict[topic_id] = lst
return result_dict
def _harden_topics(self, X_topics):
"""
Transforms soft-clustering to hard-clustering
"""
max_topics = []
for i in range(X_topics.shape[0]):
max_topics.append(X_topics[i].argmax())
X_topics = np.array(max_topics)
return X_topics
def _check_build(self):
self._check_model()
if self.topic_dict is None:
raise Exception('Must call build() method.')
def _check_scorer(self):
if self.scorer is None:
raise Exception('Must call train_scorer()')
def _check_recommender(self):
if self.recommender is None:
raise Exception('Must call train_recommender()')
def _check_model(self):
if self.model is None or self.vectorizer is None:
raise Exception('Must call train()')
def save(self, fname):
"""
save TopicModel object
"""
with open(fname+'.tm_vect', 'wb') as f:
pickle.dump(self.vectorizer, f)
with open(fname+'.tm_model', 'wb') as f:
pickle.dump(self.model, f)
params = {'n_topics': self.n_topics,
'n_features': self.n_features,
'verbose': self.verbose}
with open(fname+'.tm_params', 'wb') as f:
pickle.dump(params, f)
return
get_topic_model = TopicModel </code></pre>
</details>
</section>
<section>
</section>
<section>
</section>
<section>
</section>
<section>
<h2 class="section-title" id="header-classes">Classes</h2>
<dl>
<dt id="ktrain.text.eda.TopicModel"><code class="flex name class">
<span>class <span class="ident">TopicModel</span></span>
<span>(</span><span>texts=None, n_topics=None, n_features=10000, min_df=5, max_df=0.5, stop_words='english', model_type='lda', lda_max_iter=5, lda_mode='online', token_pattern=None, verbose=1, hyperparam_kwargs=None)</span>
</code></dt>
<dd>
<div class="desc"><p>Fits a topic model to documents in <texts>.</p>
<h2 id="example">Example</h2>
<p>tm = ktrain.text.get_topic_model(docs, n_topics=20,
n_features=1000, min_df=2, max_df=0.95)</p>
<h2 id="args">Args</h2>
<dl>
<dt><strong><code>texts</code></strong> : <code>list</code> of <code>str</code></dt>
<dd>list of texts</dd>
<dt><strong><code>n_topics</code></strong> : <code>int</code></dt>
<dd>number of topics.
If None, n_topics = min{400, sqrt[# documents/2]})</dd>
<dt><strong><code>n_features</code></strong> : <code>int</code></dt>
<dd>maximum words to consider</dd>
<dt><strong><code>max_df</code></strong> : <code>float</code></dt>
<dd>words in more than max_df proportion of docs discarded</dd>
<dt><strong><code>stop_words</code></strong> : <code>str</code> or <code>list</code></dt>
<dd>either 'english' for built-in stop words or
a list of stop words to ignore</dd>
<dt>model_type(str): type of topic model to fit. One of {'lda', 'nmf'}.
Default:'lda'</dt>
<dt><strong><code>lda_max_iter</code></strong> : <code>int</code></dt>
<dd>maximum iterations for 'lda'.
5 is default if using lda_mode='online'.
If lda_mode='batch', this should be increased (e.g., 1500).
Ignored if model_type != 'lda'</dd>
<dt><strong><code>lda_mode</code></strong> : <code>str</code></dt>
<dd>one of {'online', 'batch'}. Ignored if model_type !='lda'</dd>
</dl>
<p>token_pattern(str): regex pattern to use to tokenize documents.
verbose(bool): verbosity</p></div>
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">class TopicModel():
def __init__(self,texts=None, n_topics=None, n_features=10000,
min_df=5, max_df=0.5, stop_words='english',
model_type='lda',
lda_max_iter=5, lda_mode='online',
token_pattern=None, verbose=1,
hyperparam_kwargs=None
):
"""
Fits a topic model to documents in <texts>.
Example:
tm = ktrain.text.get_topic_model(docs, n_topics=20,
n_features=1000, min_df=2, max_df=0.95)
Args:
texts (list of str): list of texts
n_topics (int): number of topics.
If None, n_topics = min{400, sqrt[# documents/2]})
n_features (int): maximum words to consider
max_df (float): words in more than max_df proportion of docs discarded
stop_words (str or list): either 'english' for built-in stop words or
a list of stop words to ignore
model_type(str): type of topic model to fit. One of {'lda', 'nmf'}. Default:'lda'
lda_max_iter (int): maximum iterations for 'lda'. 5 is default if using lda_mode='online'.
If lda_mode='batch', this should be increased (e.g., 1500).
Ignored if model_type != 'lda'
lda_mode (str): one of {'online', 'batch'}. Ignored if model_type !='lda'
token_pattern(str): regex pattern to use to tokenize documents.
verbose(bool): verbosity
"""
self.verbose=verbose
# estimate n_topics
if n_topics is None:
if texts is None:
raise ValueError('If n_topics is None, texts must be supplied')
estimated = max(1, int(math.floor(math.sqrt(len(texts) / 2))))
n_topics = min(400, estimated)
print('n_topics automatically set to %s' % (n_topics))
# train model
if texts is not None:
(model, vectorizer) = self.train(texts, model_type=model_type,
n_topics=n_topics, n_features=n_features,
min_df = min_df, max_df = max_df,
stop_words=stop_words,
lda_max_iter=lda_max_iter, lda_mode=lda_mode,
token_pattern=token_pattern,
hyperparam_kwargs=hyperparam_kwargs)
else:
vectorizer = None
model = None
# save model and vectorizer and hyperparameter settings
self.vectorizer = vectorizer
self.model = model
self.n_topics = n_topics
self.n_features = n_features
if verbose: print('done.')
# these variables are set by self.build():
self.topic_dict = None
self.doc_topics = None
self.bool_array = None
self.scorer = None # set by self.train_scorer()
self.recommender = None # set by self.train_recommender()
return
def train(self,texts, model_type='lda', n_topics=None, n_features=10000,
min_df=5, max_df=0.5, stop_words='english',
lda_max_iter=5, lda_mode='online',
token_pattern=None, hyperparam_kwargs=None):
"""
Fits a topic model to documents in <texts>.
Example:
tm = ktrain.text.get_topic_model(docs, n_topics=20,
n_features=1000, min_df=2, max_df=0.95)
Args:
texts (list of str): list of texts
n_topics (int): number of topics.
If None, n_topics = min{400, sqrt[# documents/2]})
n_features (int): maximum words to consider
max_df (float): words in more than max_df proportion of docs discarded
stop_words (str or list): either 'english' for built-in stop words or
a list of stop words to ignore
lda_max_iter (int): maximum iterations for 'lda'. 5 is default if using lda_mode='online'.
If lda_mode='batch', this should be increased (e.g., 1500).
Ignored if model_type != 'lda'
lda_mode (str): one of {'online', 'batch'}. Ignored of model_type !='lda'
token_pattern(str): regex pattern to use to tokenize documents.
If None, a default tokenizer will be used
hyperparam_kwargs(dict): hyperparameters for LDA/NMF
Keys in this dict can be any of the following:
alpha: alpha for LDA default: 5./n_topics
beta: beta for LDA. default:0.01
nmf_alpha: alpha for NMF. default:0
l1_ratio: l1_ratio for NMF. default: 0
ngram_range: whether to consider bigrams, trigrams. default: (1,1)
Returns:
tuple: (model, vectorizer)
"""
if hyperparam_kwargs is None:
hyperparam_kwargs = {}
alpha = hyperparam_kwargs.get('alpha', 5.0 / n_topics)
beta = hyperparam_kwargs.get('beta', 0.01)
nmf_alpha = hyperparam_kwargs.get('nmf_alpha', 0)
l1_ratio = hyperparam_kwargs.get('l1_ratio', 0)
ngram_range = hyperparam_kwargs.get('ngram_range', (1,1))
# adjust defaults based on language detected
if texts is not None:
lang = TU.detect_lang(texts)
if lang != 'en':
stopwords = None if stop_words=='english' else stop_words
token_pattern = r'(?u)\b\w+\b' if token_pattern is None else token_pattern
if pp.is_nospace_lang(lang):
text_list = []
for t in texts:
text_list.append(' '.join(jieba.cut(t, HMM=False)))
texts = text_list
if self.verbose: print('lang: %s' % (lang))
# preprocess texts
if self.verbose: print('preprocessing texts...')
if token_pattern is None: token_pattern = TU.DEFAULT_TOKEN_PATTERN
#if token_pattern is None: token_pattern = r'(?u)\b\w\w+\b'
vectorizer = CountVectorizer(max_df=max_df, min_df=min_df,
max_features=n_features, stop_words=stop_words,
token_pattern=token_pattern, ngram_range=ngram_range)
x_train = vectorizer.fit_transform(texts)
# fit model
if self.verbose: print('fitting model...')
if model_type == 'lda':
model = LatentDirichletAllocation(n_components=n_topics, max_iter=lda_max_iter,
learning_method=lda_mode, learning_offset=50.,
doc_topic_prior=alpha,
topic_word_prior=beta,