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task1_joint_structured_inflection_w_chars.py
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task1_joint_structured_inflection_w_chars.py
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"""Trains and evaluates a joint-structured model for inflection generation, using the sigmorphon 2016 shared task data
files and evaluation script.
Usage:
pycnn_joint_structured_inflection.py [--cnn-mem MEM][--input=INPUT] [--hidden=HIDDEN] [--feat-input=FEAT]
[--epochs=EPOCHS] [--layers=LAYERS] [--optimization=OPTIMIZATION] TRAIN_PATH TEST_PATH RESULTS_PATH SIGMORPHON_PATH...
Arguments:
TRAIN_PATH destination path
TEST_PATH test path
RESULTS_PATH results file to be written
SIGMORPHON_PATH sigmorphon root containing data, src dirs
Options:
-h --help show this help message and exit
--cnn-mem MEM allocates MEM bytes for (py)cnn
--input=INPUT input vector dimensions
--hidden=HIDDEN hidden layer dimensions
--feat-input=FEAT feature input vector dimension
--epochs=EPOCHS amount of training epochs
--layers=LAYERS amount of layers in lstm network
--optimization=OPTIMIZATION chosen optimization method ADAM/SGD/ADAGRAD/MOMENTUM/ADADELTA
"""
import numpy as np
import random
import prepare_sigmorphon_data
import progressbar
import datetime
import time
import codecs
import os
import align
import common
from multiprocessing import Pool
from matplotlib import pyplot as plt
from docopt import docopt
from pycnn import *
# default values
INPUT_DIM = 100
FEAT_INPUT_DIM = 20
HIDDEN_DIM = 100
EPOCHS = 1
LAYERS = 2
MAX_PREDICTION_LEN = 50
OPTIMIZATION = 'ADAM'
EARLY_STOPPING = True
MAX_PATIENCE = 100
REGULARIZATION = 0.0
LEARNING_RATE = 0.0001 # 0.1
PARALLELIZE = True
NULL = '%'
UNK = '#'
EPSILON = '*'
BEGIN_WORD = '<'
END_WORD = '>'
UNK_FEAT = '@'
# TODO: add numbered epsilons to vocabulary?
# TODO: try to add attention mechanism?
# TODO: try sutskever trick - predict inverse
def main(train_path, test_path, results_file_path, sigmorphon_root_dir, input_dim, hidden_dim, feat_input_dim, epochs,
layers, optimization):
parallelize_training = PARALLELIZE
hyper_params = {'INPUT_DIM': input_dim, 'HIDDEN_DIM': hidden_dim, 'FEAT_INPUT_DIM': feat_input_dim,
'EPOCHS': epochs, 'LAYERS': layers, 'MAX_PREDICTION_LEN': MAX_PREDICTION_LEN,
'OPTIMIZATION': optimization, 'PATIENCE': MAX_PATIENCE, 'REGULARIZATION': REGULARIZATION,
'LEARNING_RATE': LEARNING_RATE}
print 'train path = ' + str(train_path)
print 'test path =' + str(test_path)
for param in hyper_params:
print param + '=' + str(hyper_params[param])
# load train and test data
(train_words, train_lemmas, train_feat_dicts) = prepare_sigmorphon_data.load_data(train_path)
(test_words, test_lemmas, test_feat_dicts) = prepare_sigmorphon_data.load_data(test_path)
alphabet, feature_types = prepare_sigmorphon_data.get_alphabet(train_words, train_lemmas, train_feat_dicts)
# used for character dropout
alphabet.append(NULL)
alphabet.append(UNK)
# used during decoding
alphabet.append(EPSILON)
alphabet.append(BEGIN_WORD)
alphabet.append(END_WORD)
# add indices to alphabet - used to indicate when copying from lemma to word
for marker in [str(i) for i in xrange(MAX_PREDICTION_LEN)]:
alphabet.append(marker)
# char 2 int
alphabet_index = dict(zip(alphabet, range(0, len(alphabet))))
inverse_alphabet_index = {index: char for char, index in alphabet_index.items()}
# feat 2 int
feature_alphabet = common.get_feature_alphabet(train_feat_dicts)
feature_alphabet.append(UNK_FEAT)
feat_index = dict(zip(feature_alphabet, range(0, len(feature_alphabet))))
# align the words to the inflections, the alignment will later be used by the model
print 'started aligning'
train_word_pairs = zip(train_lemmas, train_words)
test_word_pairs = zip(test_lemmas, test_words)
align_symbol = '~'
# train_aligned_pairs = dumb_align(train_word_pairs, align_symbol)
train_aligned_pairs = mcmc_align(train_word_pairs, align_symbol)
# TODO: align together?
test_aligned_pairs = mcmc_align(test_word_pairs, align_symbol)
# random.shuffle(train_aligned_pairs)
# for p in train_aligned_pairs[:100]:
# generate_template(p)
print 'finished aligning'
# joint model: cluster the data by POS type (features)
train_pos_to_data_indices = common.cluster_data_by_pos(train_feat_dicts)
test_pos_to_data_indices = common.cluster_data_by_pos(test_feat_dicts)
train_cluster_to_data_indices = train_pos_to_data_indices
test_cluster_to_data_indices = test_pos_to_data_indices
# factored model: cluster the data by inflection type (features)
# train_morph_to_data_indices = common.cluster_data_by_morph_type(train_feat_dicts, feature_types)
# test_morph_to_data_indices = common.cluster_data_by_morph_type(test_feat_dicts, feature_types)
# train_cluster_to_data_indices = train_morph_to_data_indices
# test_cluster_to_data_indices = test_morph_to_data_indices
# TODO: change build_model (done), train_model (in progress), predict (done), one word loss (done) etc. to take the
# features in account
# create input for each model and then parallelize or run in loop.
params = []
for cluster_index, cluster_type in enumerate(train_cluster_to_data_indices):
params.append([input_dim, hidden_dim, layers, cluster_index, cluster_type, train_lemmas, train_feat_dicts,
train_words, test_lemmas, test_feat_dicts, train_cluster_to_data_indices, test_words,
test_cluster_to_data_indices, alphabet, alphabet_index, inverse_alphabet_index, epochs,
optimization, results_file_path, train_aligned_pairs, test_aligned_pairs, feat_index,
feature_types, feat_input_dim, feature_alphabet])
if parallelize_training:
p = Pool(4)
print 'now training {0} models in parallel'.format(len(train_cluster_to_data_indices))
p.map(train_cluster_model_wrapper, params)
else:
print 'now training {0} models in loop'.format(len(train_cluster_to_data_indices))
for p in params:
train_cluster_model(*p)
print 'finished training all models'
# evaluate best models
os.system('python task1_evaluate_best_joint_structured_models.py --cnn-mem 6096 --input={0} --hidden={1} --feat-input={2} \
--epochs={3} --layers={4} --optimization={5} {6} {7} {8} {9}'.format(input_dim, hidden_dim,
feat_input_dim, epochs,
layers, optimization, train_path,
test_path,
results_file_path,
sigmorphon_root_dir))
return
def train_cluster_model_wrapper(params):
# from matplotlib import pyplot as plt
return train_cluster_model(*params)
def train_cluster_model(input_dim, hidden_dim, layers, cluster_index, cluster_type, train_lemmas, train_feat_dicts,
train_words, test_lemmas, test_feat_dicts, train_cluster_to_data_indices, test_words,
test_cluster_to_data_indices, alphabet, alphabet_index, inverse_alphabet_index, epochs,
optimization, results_file_path, train_aligned_pairs, test_aligned_pairs, feat_index,
feature_types, feat_input_dim, feature_alphabet):
# get the inflection-specific data
train_cluster_words = [train_words[i] for i in train_cluster_to_data_indices[cluster_type]]
train_cluster_lemmas = [train_lemmas[i] for i in train_cluster_to_data_indices[cluster_type]]
train_cluster_alignments = [train_aligned_pairs[i] for i in train_cluster_to_data_indices[cluster_type]]
train_cluster_feat_dicts = [train_feat_dicts[i] for i in train_cluster_to_data_indices[cluster_type]]
if len(train_cluster_words) < 1:
print 'only ' + str(len(train_cluster_words)) + ' samples for this inflection type. skipping'
# continue
else:
print 'now training model for cluster ' + str(cluster_index + 1) + '/' + \
str(len(train_cluster_to_data_indices)) + ': ' + cluster_type + ' with ' + \
str(len(train_cluster_words)) + ' examples'
# build model
initial_model, encoder_frnn, encoder_rrnn, decoder_rnn = build_model(alphabet, input_dim, hidden_dim, layers,
feature_types, feat_input_dim,
feature_alphabet)
# TODO: now dev and test are the same - change later when test sets are available
# get dev lemmas for early stopping
try:
dev_cluster_lemmas = [test_lemmas[i] for i in test_cluster_to_data_indices[cluster_type]]
dev_cluster_words = [test_words[i] for i in test_cluster_to_data_indices[cluster_type]]
dev_cluster_alignments = [test_aligned_pairs[i] for i in test_cluster_to_data_indices[cluster_type]]
dev_cluster_feat_dicts = [test_feat_dicts[i] for i in test_cluster_to_data_indices[cluster_type]]
except KeyError:
dev_cluster_lemmas = []
dev_cluster_words = []
dev_cluster_alignments = []
dev_cluster_feat_dicts = []
print 'could not find relevant examples in dev data for cluster: ' + cluster_type
# train model
trained_model = train_model(initial_model, encoder_frnn, encoder_rrnn, decoder_rnn, train_cluster_lemmas,
train_cluster_feat_dicts, train_cluster_words, dev_cluster_lemmas,
dev_cluster_feat_dicts, dev_cluster_words, alphabet_index, inverse_alphabet_index,
epochs, optimization, results_file_path, str(cluster_index),
train_cluster_alignments, dev_cluster_alignments, feat_index, feature_types)
# evaluate last model on dev
predicted_templates = predict_templates(trained_model, decoder_rnn, encoder_frnn, encoder_rrnn, alphabet_index,
inverse_alphabet_index, dev_cluster_lemmas, dev_cluster_feat_dicts,
feat_index,
feature_types)
if len(predicted_templates) > 0:
evaluate_model(predicted_templates, dev_cluster_lemmas, dev_cluster_feat_dicts, dev_cluster_words,
feature_types, print_results=True)
else:
print 'no examples in dev set to evaluate'
return trained_model
def build_model(alphabet, input_dim, hidden_dim, layers, feature_types, feat_input_dim, feature_alphabet):
print 'creating model...'
model = Model()
# character embeddings
model.add_lookup_parameters("char_lookup", (len(alphabet), input_dim))
# feature embeddings
# TODO: add another input dim for features?
model.add_lookup_parameters("feat_lookup", (len(feature_alphabet), feat_input_dim))
# used in softmax output
model.add_parameters("R", (len(alphabet), hidden_dim))
model.add_parameters("bias", len(alphabet))
# rnn's
encoder_frnn = LSTMBuilder(layers, input_dim, hidden_dim, model)
encoder_rrnn = LSTMBuilder(layers, input_dim, hidden_dim, model)
# 2 * HIDDEN_DIM + 4 * INPUT_DIM, as it gets a concatenation of frnn, rrnn, previous output template char,
# index char, lemma char, previous (instantiated) output char
# decoder_rnn = LSTMBuilder(layers, 2 * hidden_dim + 4 * input_dim, hidden_dim, model)
decoder_rnn = LSTMBuilder(layers, 2 * hidden_dim + 4 * input_dim + len(feature_types) * feat_input_dim, hidden_dim,
model)
print 'finished creating model'
return model, encoder_frnn, encoder_rrnn, decoder_rnn
def train_model(model, encoder_frnn, encoder_rrnn, decoder_rnn, train_lemmas, train_feat_dicts, train_words, dev_lemmas,
dev_feat_dicts, dev_words, alphabet_index, inverse_alphabet_index, epochs, optimization,
results_file_path, morph_index, train_aligned_pairs, dev_aligned_pairs, feat_index, feature_types):
print 'training...'
np.random.seed(17)
random.seed(17)
if optimization == 'ADAM':
trainer = AdamTrainer(model, lam=REGULARIZATION, alpha=LEARNING_RATE, beta_1=0.9, beta_2=0.999, eps=1e-8)
elif optimization == 'MOMENTUM':
trainer = MomentumSGDTrainer(model)
elif optimization == 'SGD':
trainer = SimpleSGDTrainer(model)
elif optimization == 'ADAGRAD':
trainer = AdagradTrainer(model)
elif optimization == 'ADADELTA':
trainer = AdadeltaTrainer(model)
else:
trainer = SimpleSGDTrainer(model)
total_loss = 0
best_avg_dev_loss = 999
best_dev_accuracy = -1
best_train_accuracy = -1
patience = 0
train_len = len(train_words)
epochs_x = []
train_loss_y = []
dev_loss_y = []
train_accuracy_y = []
dev_accuracy_y = []
# progress bar init
widgets = [progressbar.Bar('>'), ' ', progressbar.ETA()]
train_progress_bar = progressbar.ProgressBar(widgets=widgets, maxval=epochs).start()
avg_loss = -1
for e in xrange(epochs):
# randomize the training set
indices = range(train_len)
random.shuffle(indices)
train_set = zip(train_lemmas, train_feat_dicts, train_words, train_aligned_pairs)
train_set = [train_set[i] for i in indices]
# compute loss for each example and update
for i, example in enumerate(train_set):
lemma, feats, word, alignment = example
loss = one_word_loss(model, encoder_frnn, encoder_rrnn, decoder_rnn, lemma, feats, word,
alphabet_index, alignment, feat_index, feature_types)
loss_value = loss.value()
total_loss += loss_value
loss.backward()
trainer.update()
if i > 0:
avg_loss = total_loss / float(i + e * train_len)
else:
avg_loss = total_loss
if EARLY_STOPPING:
# get train accuracy
train_predictions = predict_templates(model, decoder_rnn, encoder_frnn, encoder_rrnn, alphabet_index,
inverse_alphabet_index, train_lemmas, train_feat_dicts, feat_index,
feature_types)
print 'train:'
train_accuracy = evaluate_model(train_predictions, train_lemmas, train_feat_dicts, train_words,
feature_types, False)[1]
if train_accuracy > best_train_accuracy:
best_train_accuracy = train_accuracy
dev_accuracy = 0
avg_dev_loss = 0
if len(dev_lemmas) > 0:
# get dev accuracy
dev_predictions = predict_templates(model, decoder_rnn, encoder_frnn, encoder_rrnn, alphabet_index,
inverse_alphabet_index, dev_lemmas, dev_feat_dicts, feat_index,
feature_types)
print 'dev:'
# get dev accuracy
dev_accuracy = evaluate_model(dev_predictions, dev_lemmas, dev_feat_dicts, dev_words, feature_types,
False)[1]
if dev_accuracy > best_dev_accuracy:
best_dev_accuracy = dev_accuracy
# save best model to disk
save_pycnn_model(model, results_file_path, morph_index)
print 'saved new best model'
patience = 0
else:
patience += 1
# found "perfect" model
if dev_accuracy == 1:
train_progress_bar.finish()
if not PARALLELIZE:
plt.cla()
return model
# get dev loss
total_dev_loss = 0
for i in xrange(len(dev_lemmas)):
total_dev_loss += one_word_loss(model, encoder_frnn, encoder_rrnn, decoder_rnn, dev_lemmas[i],
dev_feat_dicts[i], dev_words[i], alphabet_index,
dev_aligned_pairs[i], feat_index, feature_types).value()
avg_dev_loss = total_dev_loss / float(len(dev_lemmas))
if avg_dev_loss < best_avg_dev_loss:
best_avg_dev_loss = avg_dev_loss
print 'epoch: {0} train loss: {1:.2f} dev loss: {2:.2f} dev accuracy: {3:.2f} train accuracy = {4:.2f} \
best dev accuracy {5:.2f} best train accuracy: {6:.2f} patience = {7}'.format(e, avg_loss, avg_dev_loss, dev_accuracy,
train_accuracy, best_dev_accuracy,
best_train_accuracy, patience)
if patience == MAX_PATIENCE:
print 'out of patience after {0} epochs'.format(str(e))
# TODO: would like to return best model but pycnn has a bug with save and load. Maybe copy via code?
# return best_model[0]
train_progress_bar.finish()
if not PARALLELIZE:
plt.cla()
return model
else:
# if no dev set is present, optimize on train set
print 'no dev set for early stopping, running all epochs until perfectly fitting or patience was \
reached on the train set'
if train_accuracy > best_train_accuracy:
best_train_accuracy = train_accuracy
# save best model to disk
save_pycnn_model(model, results_file_path, morph_index)
print 'saved new best model'
patience = 0
else:
patience += 1
print 'epoch: {0} train loss: {1:.2f} train accuracy = {2:.2f} best train accuracy: {3:.2f} \
patience = {4}'.format(e, avg_loss, train_accuracy, best_train_accuracy, patience)
# found "perfect" model on train set or patience has reached
if train_accuracy == 1 or patience == MAX_PATIENCE:
train_progress_bar.finish()
if not PARALLELIZE:
plt.cla()
return model
# update lists for plotting
train_accuracy_y.append(train_accuracy)
epochs_x.append(e)
train_loss_y.append(avg_loss)
dev_loss_y.append(avg_dev_loss)
dev_accuracy_y.append(dev_accuracy)
# finished epoch
train_progress_bar.update(e)
if not PARALLELIZE:
with plt.style.context('fivethirtyeight'):
p1, = plt.plot(epochs_x, dev_loss_y, label='dev loss')
p2, = plt.plot(epochs_x, train_loss_y, label='train loss')
p3, = plt.plot(epochs_x, dev_accuracy_y, label='dev acc.')
p4, = plt.plot(epochs_x, train_accuracy_y, label='train acc.')
plt.legend(loc='upper left', handles=[p1, p2, p3, p4])
plt.savefig(results_file_path + '_' + morph_index + '.png')
train_progress_bar.finish()
if not PARALLELIZE:
plt.cla()
print 'finished training. average loss: ' + str(avg_loss)
return model
def save_pycnn_model(model, results_file_path, morph_index):
tmp_model_path = results_file_path + '_' + morph_index + '_bestmodel.txt'
print 'saving to ' + tmp_model_path
model.save(tmp_model_path)
print 'saved to {0}'.format(tmp_model_path)
# noinspection PyPep8Naming
def predict_inflection_template(model, encoder_frnn, encoder_rrnn, decoder_rnn, lemma, feats, alphabet_index,
inverse_alphabet_index, feat_index, feature_types):
renew_cg()
# read the parameters
char_lookup = model["char_lookup"]
feat_lookup = model["feat_lookup"]
R = parameter(model["R"])
bias = parameter(model["bias"])
# convert characters to matching embeddings, if UNK handle properly
lemma = BEGIN_WORD + lemma + END_WORD
lemma_char_vecs = []
for char in lemma:
try:
lemma_char_vecs.append(char_lookup[alphabet_index[char]])
except KeyError:
# handle UNK
lemma_char_vecs.append(char_lookup[alphabet_index[UNK]])
# convert features to matching embeddings, if UNK handle properly
feat_vecs = []
for feat in sorted(feature_types):
# TODO: is it OK to use same UNK for all feature types? and for unseen feats as well?
# if this feature has a value, take it from the lookup. otherwise use UNK
if feat in feats:
feat_str = feat + ':' + feats[feat]
try:
feat_vecs.append(feat_lookup[feat_index[feat_str]])
except KeyError:
# handle UNK or dropout
feat_vecs.append(feat_lookup[feat_index[UNK_FEAT]])
else:
feat_vecs.append(feat_lookup[feat_index[UNK_FEAT]])
feats_input = concatenate(feat_vecs)
# bilstm forward pass
s_0 = encoder_frnn.initial_state()
s = s_0
for c in lemma_char_vecs:
s = s.add_input(c)
encoder_frnn_h = s.h()
# bilstm backward pass
s_0 = encoder_rrnn.initial_state()
s = s_0
for c in reversed(lemma_char_vecs):
s = s.add_input(c)
encoder_rrnn_h = s.h()
# concatenate BILSTM final hidden states
if len(encoder_rrnn_h) == 1 and len(encoder_frnn_h) == 1:
encoded = concatenate([encoder_frnn_h[0], encoder_rrnn_h[0]])
else:
# if there's more than one layer, take the last one
encoded = concatenate([encoder_frnn_h[-1], encoder_rrnn_h[-1]])
# initialize the decoder rnn
s_0 = decoder_rnn.initial_state()
s = s_0
# set prev_template_output_vec for first lstm step as BEGIN_WORD
prev_template_output_vec = char_lookup[alphabet_index[BEGIN_WORD]]
prev_output_vec = char_lookup[alphabet_index[BEGIN_WORD]]
i = 0
predicted_template = []
# run the decoder through the sequence and predict characters
while i < MAX_PREDICTION_LEN:
# if the lemma is finished, pad with epsilon chars
if i < len(lemma):
try:
lemma_input_char_vec = char_lookup[alphabet_index[lemma[i]]]
except KeyError:
# handle unseen characters
lemma_input_char_vec = char_lookup[alphabet_index[UNK]]
else:
lemma_input_char_vec = char_lookup[alphabet_index[EPSILON]]
decoder_input = concatenate([encoded,
prev_template_output_vec,
lemma_input_char_vec,
prev_output_vec,
char_lookup[alphabet_index[str(i)]],
feats_input])
# prepare input vector and perform LSTM step
# decoder_input = concatenate([encoded, prev_template_output_vec])
s = s.add_input(decoder_input)
# compute softmax probs and predict
decoder_rnn_output = s.output()
probs = softmax(R * decoder_rnn_output + bias)
probs = probs.vec_value()
next_char_index = common.argmax(probs)
predicted_template.append(inverse_alphabet_index[next_char_index])
# check if reached end of word
if predicted_template[-1] == END_WORD:
break
# prepare for the next iteration
# prev_template_output_vec = lookup[next_char_index]
prev_template_output_vec = decoder_rnn_output
next_char = inverse_alphabet_index[next_char_index]
if next_char.isdigit() and int(next_char) < len(lemma):
# if index, "copy" char from lemma
prev_output_vec = char_lookup[alphabet_index[lemma[int(next_char)]]]
else:
prev_output_vec = char_lookup[alphabet_index[next_char]]
i += 1
# remove the begin and end word symbols
return predicted_template[0:-1]
def predict_templates(model, decoder_rnn, encoder_frnn, encoder_rrnn, alphabet_index, inverse_alphabet_index, lemmas,
feats, feat_index, feature_types):
predictions = {}
for i, (lemma, feat_dict) in enumerate(zip(lemmas, feats)):
predicted_template = predict_inflection_template(model, encoder_frnn, encoder_rrnn, decoder_rnn, lemma,
feat_dict, alphabet_index, inverse_alphabet_index, feat_index,
feature_types)
joint_index = lemma + ':' + common.get_morph_string(feat_dict, feature_types)
predictions[joint_index] = predicted_template
return predictions
def instantiate_template(template, lemma):
word = ''
for t in template:
if represents_int(t):
try:
word = word + lemma[int(t)]
except IndexError:
continue
else:
word = word + t
return word
def represents_int(s):
try:
int(s)
return True
except ValueError:
return False
def evaluate_model(predicted_templates, lemmas, feature_dicts, words, feature_types, print_results=True):
if print_results:
print 'evaluating model...'
# TODO: 2 possible approaches: one - predict template, instantiate, check if equal to word
# TODO: two - predict template, generate template using the correct word, check if templates are equal
# TODO: for now, go with one, maybe try two later
test_data = zip(lemmas, feature_dicts, words)
c = 0
for i, (lemma, feat_dict, word) in enumerate(test_data):
joint_index = lemma + ':' + common.get_morph_string(feat_dict, feature_types)
predicted_word = instantiate_template(predicted_templates[joint_index], lemma)
if predicted_word == word:
c += 1
sign = 'V'
else:
sign = 'X'
if print_results:
print 'lemma: ' + lemma + ' gold: ' + words[i] + ' template:' + ''.join(predicted_templates[joint_index]) \
+ ' prediction: ' + predicted_word + ' ' + sign
accuracy = float(c) / len(predicted_templates)
if print_results:
print 'finished evaluating model. accuracy: ' + str(c) + '/' + str(len(predicted_templates)) + '=' + \
str(accuracy) + '\n\n'
return len(predicted_templates), accuracy
# noinspection PyPep8Naming
def generate_template_from_alignment(aligned_pair):
# go through alignment
# if lemma and inflection are equal, output copy index of lemma
# if they are not equal - output the inflection char
template = []
lemma_index = 0
aligned_lemma, aligned_word = aligned_pair
for i in xrange(len(aligned_lemma)):
# if added prefix, add it to template
if aligned_lemma[i] == '~':
template.append(aligned_word[i])
continue
# if deleted prefix, promote lemma index and continue
elif aligned_word[i] == '~':
lemma_index += 1
continue
# if both are not ~, check if equal. if they are, add lemma index. else, add word char.
elif aligned_lemma[i] == aligned_word[i]:
template.append(str(lemma_index))
else:
template.append(aligned_word[i])
# promote lemma index
lemma_index += 1
return template
# noinspection PyPep8Naming
def one_word_loss(model, encoder_frnn, encoder_rrnn, decoder_rnn, lemma, feats, word, alphabet_index, aligned_pair,
feat_index, feature_types):
renew_cg()
# read the parameters
char_lookup = model["char_lookup"]
feat_lookup = model["feat_lookup"]
R = parameter(model["R"])
bias = parameter(model["bias"])
# convert characters to matching embeddings, if UNK handle properly
template = generate_template_from_alignment(aligned_pair)
# sanity check
instantiated = instantiate_template(template, lemma)
if not instantiated == word:
print 'bad train instantiation:'
print lemma
print word
print template
print instantiated
raise Exception()
lemma = BEGIN_WORD + lemma + END_WORD
# convert characters to matching embeddings
lemma_char_vecs = []
for char in lemma:
try:
lemma_char_vecs.append(char_lookup[alphabet_index[char]])
except KeyError:
# handle UNK
lemma_char_vecs.append(char_lookup[alphabet_index[UNK]])
# convert features to matching embeddings, if UNK handle properly
feat_vecs = []
for feat in sorted(feature_types):
# TODO: is it OK to use same UNK for all feature types? and for unseen feats as well?
# if this feature has a value, take it from the lookup. otherwise use UNK
if feat in feats:
feat_str = feat + ':' + feats[feat]
try:
feat_vecs.append(feat_lookup[feat_index[feat_str]])
except KeyError:
# handle UNK or dropout
feat_vecs.append(feat_lookup[feat_index[UNK_FEAT]])
else:
feat_vecs.append(feat_lookup[feat_index[UNK_FEAT]])
feats_input = concatenate(feat_vecs)
# bilstm forward pass
s_0 = encoder_frnn.initial_state()
s = s_0
for c in lemma_char_vecs:
s = s.add_input(c)
encoder_frnn_h = s.h()
# bilstm backward pass
s_0 = encoder_rrnn.initial_state()
s = s_0
for c in reversed(lemma_char_vecs):
s = s.add_input(c)
encoder_rrnn_h = s.h()
# concatenate BILSTM final hidden states
if len(encoder_rrnn_h) == 1 and len(encoder_frnn_h) == 1:
encoded = concatenate([encoder_frnn_h[0], encoder_rrnn_h[0]])
else:
# if there's more than one hidden layer in the rnn's, take the last one
encoded = concatenate([encoder_frnn_h[-1], encoder_rrnn_h[-1]])
# initialize the decoder rnn
s_0 = decoder_rnn.initial_state()
s = s_0
# set prev_output_vec for first lstm step as BEGIN_WORD
# TODO: change this so it'll be possible to use different dims for input and hidden
prev_output_vec = char_lookup[alphabet_index[BEGIN_WORD]]
loss = []
# TODO: now for the fun part: using the alignments, replace characters in word with lemma indices (if copied),
# TODO: otherwise leave as is. Then compute loss normally (or by instantiating accordingly in prediction time)
# TODO: try sutskever flip trick?
# TODO: attention on the lemma chars could help here?
# TODO: think about the best heuristic to create a template from the aligned pair with respect to the network loss
# template.insert(0, BEGIN_WORD)
template.append(END_WORD)
word_chars = list(word)
word_chars.append(END_WORD)
# run the decoder through the sequence and aggregate loss
for i, template_char in enumerate(template):
# if the lemma is finished, pad with epsilon chars
if i < len(lemma):
try:
lemma_input_char_vec = char_lookup[alphabet_index[lemma[i]]]
except KeyError:
# handle UNK
lemma_input_char_vec = char_lookup[alphabet_index[UNK]]
else:
lemma_input_char_vec = char_lookup[alphabet_index[EPSILON]]
# TODO: check if template index char helps, maybe redundant
# encoded lemma, previous output (hidden) vector, lemma input char, template index char, features
decoder_input = concatenate([encoded, prev_output_vec, lemma_input_char_vec,
char_lookup[alphabet_index[word_chars[i]]], # add the predicted word char
char_lookup[alphabet_index[str(i)]],
feats_input])
# decoder_input = concatenate([encoded, prev_output_vec])
s = s.add_input(decoder_input)
decoder_rnn_output = s.output()
probs = softmax(R * decoder_rnn_output + bias)
loss.append(-log(pick(probs, alphabet_index[template_char])))
# prepare for the next iteration
prev_output_vec = decoder_rnn_output
# TODO: maybe here a "special" loss function is appropriate?
# loss = esum(loss)
loss = average(loss)
return loss
def dumb_align(wordpairs, align_symbol):
alignedpairs = []
for idx, pair in enumerate(wordpairs):
ins = pair[0]
outs = pair[1]
if len(ins) > len(outs):
outs += align_symbol * (len(ins) - len(outs))
elif len(outs) > len(ins):
ins += align_symbol * (len(outs) - len(ins))
alignedpairs.append((ins, outs))
return alignedpairs
def mcmc_align(wordpairs, align_symbol):
a = align.Aligner(wordpairs, align_symbol=align_symbol)
return a.alignedpairs
def med_align(wordpairs, align_symbol):
a = align.Aligner(wordpairs, align_symbol=align_symbol, mode='med')
return a.alignedpairs
if __name__ == '__main__':
arguments = docopt(__doc__)
ts = time.time()
st = datetime.datetime.fromtimestamp(ts).strftime('%Y-%m-%d_%H:%M:%S')
# default values
if arguments['TRAIN_PATH']:
train_path_param = arguments['TRAIN_PATH']
else:
train_path_param = '/Users/roeeaharoni/research_data/sigmorphon2016-master/data/turkish-task1-train'
if arguments['TEST_PATH']:
test_path_param = arguments['TEST_PATH']
else:
test_path_param = '/Users/roeeaharoni/research_data/sigmorphon2016-master/data/turkish-task1-dev'
if arguments['RESULTS_PATH']:
results_file_path_param = arguments['RESULTS_PATH']
else:
results_file_path_param = \
'/Users/roeeaharoni/Dropbox/phd/research/morphology/inflection_generation/results/results_' + st + '.txt'
if arguments['SIGMORPHON_PATH']:
sigmorphon_root_dir_param = arguments['SIGMORPHON_PATH'][0]
else:
sigmorphon_root_dir_param = '/Users/roeeaharoni/research_data/sigmorphon2016-master/'
if arguments['--input']:
input_dim_param = int(arguments['--input'])
else:
input_dim_param = INPUT_DIM
if arguments['--hidden']:
hidden_dim_param = int(arguments['--hidden'])
else:
hidden_dim_param = HIDDEN_DIM
if arguments['--feat-input']:
feat_input_dim_param = int(arguments['--feat-input'])
else:
feat_input_dim_param = FEAT_INPUT_DIM
if arguments['--epochs']:
epochs_param = int(arguments['--epochs'])
else:
epochs_param = EPOCHS
if arguments['--layers']:
layers_param = int(arguments['--layers'])
else:
layers_param = LAYERS
if arguments['--optimization']:
optimization_param = arguments['--optimization']
else:
optimization_param = OPTIMIZATION
print arguments
main(train_path_param, test_path_param, results_file_path_param, sigmorphon_root_dir_param, input_dim_param,
hidden_dim_param, feat_input_dim_param, epochs_param, layers_param, optimization_param)