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dialogue.py
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dialogue.py
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from keras import Model
from keras.layers import Input, Embedding, LSTM, Dropout, Dense, CuDNNLSTM, CuDNNGRU
from helper import DenseTransposeTied
from keras.optimizers import Adam
import keras.backend as K
import copy
from collections import defaultdict
from data_loader.load_cornell_movie import load_ubuntu_by_user, load_cornell_movie_by_user
from sated_nmt import beam_search, bleu_score
import pprint
import numpy as np
MODEL_PATH = '/hdd/song/nlp/cornell_movie_dialogs_corpus/model/'
OUTPUT_PATH = '/hdd/song/nlp/cornell_movie_dialogs_corpus/output/'
def group_texts_by_len(src_texts, trg_texts, bs=20):
print("Bucketing batches")
# Bucket samples by source sentence length
buckets = defaultdict(list)
batches = []
for src, trg in zip(src_texts, trg_texts):
buckets[len(src)].append((src, trg))
for src_len, bucket in buckets.items():
np.random.shuffle(bucket)
num_batches = int(np.ceil(len(bucket) * 1.0 / bs))
for i in range(num_batches):
cur_batch_size = bs if i < num_batches - 1 else len(bucket) - bs * i
batches.append(([bucket[i * bs + j][0] for j in range(cur_batch_size)],
[bucket[i * bs + j][1] for j in range(cur_batch_size)]))
return batches
def build_dialogue_model(Vs, Vt, demb=128, h=128, drop_p=0.5, tied=True, mask=True, training=None, rnn_fn='lstm'):
if rnn_fn == 'lstm':
rnn = LSTM if mask else CuDNNLSTM
elif rnn_fn == 'gru':
rnn = LSTM if mask else CuDNNGRU
else:
raise ValueError(rnn_fn)
# build encoder
encoder_input = Input((None,), dtype='float32', name='encoder_input')
if mask:
encoder_emb_layer = Embedding(Vs + 1, demb, mask_zero=True, name='encoder_emb')
else:
encoder_emb_layer = Embedding(Vs, demb, mask_zero=False, name='encoder_emb')
encoder_emb = encoder_emb_layer(encoder_input)
if drop_p > 0.:
encoder_emb = Dropout(drop_p)(encoder_emb, training=training)
encoder_rnn = rnn(h, return_sequences=True, return_state=True, name='encoder_rnn')
encoder_rtn = encoder_rnn(encoder_emb)
# # encoder_outputs, encoder_h, encoder_c = encoder_rnn(encoder_emb)
# encoder_outputs = encoder_rtn[0]
encoder_states = encoder_rtn[1:]
# build decoder
decoder_input = Input((None,), dtype='float32', name='decoder_input')
if mask:
decoder_emb_layer = Embedding(Vt + 1, demb, mask_zero=True, name='decoder_emb')
else:
decoder_emb_layer = Embedding(Vt, demb, mask_zero=False, name='decoder_emb')
decoder_emb = decoder_emb_layer(decoder_input)
if drop_p > 0.:
decoder_emb = Dropout(drop_p)(decoder_emb, training=training)
decoder_rnn = rnn(h, return_sequences=True, name='decoder_rnn')
decoder_outputs = decoder_rnn(decoder_emb, initial_state=encoder_states)
if drop_p > 0.:
decoder_outputs = Dropout(drop_p)(decoder_outputs, training=training)
if tied:
final_outputs = DenseTransposeTied(Vt, tied_to=decoder_emb_layer,
activation='linear', name='outputs')(decoder_outputs)
else:
final_outputs = Dense(Vt, activation='linear', name='outputs')(decoder_outputs)
model = Model(inputs=[encoder_input, decoder_input], outputs=[final_outputs])
return model
def build_inference_decoder(mask=False, demb=128, h=128, Vt=5000, tied=True):
rnn = LSTM if mask else CuDNNLSTM
# build decoder
decoder_input = Input(batch_shape=(None, None), dtype='float32', name='decoder_input')
encoder_outputs = Input(batch_shape=(None, None, h), dtype='float32', name='encoder_outputs')
encoder_h = Input(batch_shape=(None, h), dtype='float32', name='encoder_h')
encoder_c = Input(batch_shape=(None, h), dtype='float32', name='encoder_c')
if mask:
decoder_emb_layer = Embedding(Vt + 1, demb, mask_zero=True,
name='decoder_emb')
else:
decoder_emb_layer = Embedding(Vt, demb, mask_zero=False,
name='decoder_emb')
decoder_emb = decoder_emb_layer(decoder_input)
decoder_rnn = rnn(h, return_sequences=True, name='decoder_rnn')
decoder_outputs = decoder_rnn(decoder_emb, initial_state=[encoder_h, encoder_c])
if tied:
final_outputs = DenseTransposeTied(Vt, name='outputs',
tied_to=decoder_emb_layer, activation='linear')(decoder_outputs)
else:
final_outputs = Dense(Vt, activation='linear', name='outputs')(decoder_outputs)
inputs = [decoder_input, encoder_outputs, encoder_h, encoder_c]
model = Model(inputs=inputs, outputs=[final_outputs])
return model
def words_to_indices(data, vocab, mask=True):
if mask:
return [[vocab[w] + 1 for w in t] for t in data]
else:
return [[vocab[w] for w in t] for t in data]
def pad_texts(texts, eos, mask=True):
maxlen = max(len(t) for t in texts)
for t in texts:
while len(t) < maxlen:
if mask:
t.insert(0, 0)
else:
t.append(eos)
return np.asarray(texts, dtype='float32')
def train_cornell_movie(loo=0, num_users=200, num_words=5000, num_epochs=20, sample_user=False, exp_id=0, emb_h=128,
lr=0.001, batch_size=32, mask=False, drop_p=0.5, h=128, user_data_ratio=0., cross_domain=False,
ablation=False, tied=True, rnn_fn='gru'):
if cross_domain:
sample_user = True
loo = None
user_src_texts, user_trg_texts, dev_src_texts, dev_trg_texts, test_src_texts, test_trg_texts, \
src_vocabs, trg_vocabs = load_ubuntu_by_user(num_users, num_words=num_words)
else:
user_src_texts, user_trg_texts, dev_src_texts, dev_trg_texts, test_src_texts, test_trg_texts, \
src_vocabs, trg_vocabs = load_cornell_movie_by_user(num_users, num_words, user_data_ratio=user_data_ratio,
sample_user=sample_user)
train_src_texts, train_trg_texts = [], []
users = sorted(user_src_texts.keys())
for i, user in enumerate(users):
if loo is not None and i == loo:
print "Leave user {} out".format(user)
continue
train_src_texts += user_src_texts[user]
train_trg_texts += user_trg_texts[user]
train_src_texts = words_to_indices(train_src_texts, src_vocabs, mask=mask)
train_trg_texts = words_to_indices(train_trg_texts, trg_vocabs, mask=mask)
dev_src_texts = words_to_indices(dev_src_texts, src_vocabs, mask=mask)
dev_trg_texts = words_to_indices(dev_trg_texts, trg_vocabs, mask=mask)
print "Num train data {}, num test data {}".format(len(train_src_texts), len(dev_src_texts))
Vs = len(src_vocabs)
Vt = len(trg_vocabs)
print Vs, Vt
model = build_dialogue_model(Vs=Vs, Vt=Vt, mask=mask, drop_p=drop_p, demb=emb_h, h=h, tied=tied, rnn_fn=rnn_fn)
src_input_var, trg_input_var = model.inputs
prediction = model.output
trg_label_var = K.placeholder((None, None), dtype='float32')
loss = K.sparse_categorical_crossentropy(trg_label_var, prediction, from_logits=True)
loss = K.mean(K.sum(loss, axis=-1))
optimizer = Adam(lr=lr)
updates = optimizer.get_updates(loss, model.trainable_weights)
train_fn = K.function([src_input_var, trg_input_var, trg_label_var, K.learning_phase()], [loss], updates=updates)
pred_fn = K.function([src_input_var, trg_input_var, trg_label_var, K.learning_phase()], [loss])
# pad batches to same length
batches = []
padded_train_src_texts = copy.deepcopy(train_src_texts)
padded_train_trg_texts = copy.deepcopy(train_trg_texts)
for batch in group_texts_by_len(padded_train_src_texts, padded_train_trg_texts, bs=batch_size):
src_input, trg_input = batch
src_input = pad_texts(src_input, src_vocabs['<eos>'], mask=mask)
trg_input = pad_texts(trg_input, trg_vocabs['<eos>'], mask=mask)
batches.append((src_input, trg_input))
for epoch in range(num_epochs):
np.random.shuffle(batches)
for batch in batches:
src_input, trg_input = batch
_ = train_fn([src_input, trg_input[:, :-1], trg_input[:, 1:], 1])[0]
train_loss, train_it = get_perp(train_src_texts, train_trg_texts, pred_fn, shuffle=True, prop=0.5)
test_loss, test_it = get_perp(dev_src_texts, dev_trg_texts, pred_fn)
print "Epoch {}, train loss={:.3f}, train perp={:.3f}, test loss={:.3f}, test perp={:.3f}".format(
epoch, train_loss / len(train_src_texts) / 0.5,
np.exp(train_loss / train_it), test_loss / len(dev_src_texts),
np.exp(test_loss / test_it))
if cross_domain:
fname = 'ubuntu_dialog'
else:
fname = 'cornell_movie_dialog{}'.format('' if loo is None else loo)
if ablation:
fname = 'ablation_' + fname
if 0. < user_data_ratio < 1.:
fname += '_dr{}'.format(user_data_ratio)
if sample_user:
fname += '_shadow_exp{}_{}'.format(exp_id, rnn_fn)
np.savez(MODEL_PATH + 'shadow_users{}_{}_{}_{}.npz'.format(exp_id, rnn_fn, num_users,
'cd' if cross_domain else ''), users)
model.save(MODEL_PATH + '{}_{}.h5'.format(fname, num_users))
def get_perp(user_src_data, user_trg_data, pred_fn, prop=1.0, shuffle=False):
loss = 0.
iters = 0.
indices = np.arange(len(user_src_data))
n = int(prop * len(indices))
if shuffle:
np.random.shuffle(indices)
for idx in indices[:n]:
src_text = np.asarray(user_src_data[idx], dtype=np.float32).reshape(1, -1)
trg_text = np.asarray(user_trg_data[idx], dtype=np.float32)
trg_input = trg_text[:-1].reshape(1, -1)
trg_label = trg_text[1:].reshape(1, -1)
err = pred_fn([src_text, trg_input, trg_label, 0])[0]
loss += err
iters += trg_label.shape[1]
return loss, iters
if __name__ == '__main__':
train_cornell_movie(loo=None, num_users=300, sample_user=False, num_epochs=30, drop_p=0.5, h=128, emb_h=128)