def eval_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
encoder_outputs, encoder_hidden, max_encoder_output = self.model.encoder(enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
if config.use_maxpool_init_ctx:
c_t_1 = max_encoder_output
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1,attn_dist, p_gen, coverage = self.model.decoder(y_t_1, s_t_1,
encoder_outputs, enc_padding_mask, c_t_1,
extra_zeros, enc_batch_extend_vocab, coverage)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1, target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_step_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_step_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
return loss.data[0]
def eval_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1,attn_dist, p_gen, next_coverage = self.model.decoder(y_t_1, s_t_1,
encoder_outputs, encoder_feature, enc_padding_mask, c_t_1,
extra_zeros, enc_batch_extend_vocab, coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1, target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_step_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_step_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
return loss.data[0]
def train_one_batch(self, batch, iter):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
words = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros, enc_batch_extend_vocab,
coverage, di)
words.append(self.vocab.id2word(final_dist[0].argmax().item()))
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
# print('step_loss',step_loss)
# print('step_loss.size()',step_loss.size())
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
if iter % 100 == 0:
print(words)
print([self.vocab.id2word(idx.item()) for idx in dec_batch[0]])
print([self.vocab.id2word(idx.item()) for idx in target_batch[0]])
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch, iter):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
# print(target_batch[:, 1:].contiguous().view(-1)[-10:])
#print(dec_batch[:, 1:].contiguous().view(-1)[-10:])
in_seq = enc_batch
in_pos = self.get_pos_data(enc_padding_mask)
tgt_seq = dec_batch
tgt_pos = self.get_pos_data(dec_padding_mask)
# padding is already done in previous function (see batcher.py - init_decoder_seq & init_decoder_seq - Batch class)
self.optimizer.zero_grad()
#logits = self.model.forward(in_seq, in_pos, tgt_seq, tgt_pos)
logits = self.model.forward(in_seq, in_pos, tgt_seq, tgt_pos, extra_zeros, enc_batch_extend_vocab)
# compute loss from logits
loss = self.loss_func(logits, target_batch.contiguous().view(-1))
# target_batch[torch.gather(logits, 2, target_batch.unsqueeze(2)).squeeze(2) == 0] = 1
# target_batch = target_batch.contiguous().view(-1)
# logits = logits.reshape(-1, logits.size()[2])
# print(target_batch)
# print('\n')
# print(logits.size(), target_batch.size())
# print('\n')
#loss = self.loss_func(logits, target_batch)
#print(loss)
#sum_losses = torch.mean(torch.stack(losses, 1), 1)
if iter % 50 == 0 and False:
print(iter, loss)
print('\n')
# print(logits.max(1)[1][:20])
# print('\n')
# print(target_batch.contiguous().view(-1)[:20])
# print('\n')
#print(target_batch.contiguous().view(-1)[-10:])
loss.backward()
#print(logits.max(1)[1])
#print('\n')
#print(tgt_seq[:, 1:].contiguous().view(-1)[:10])
#print(tgt_seq[:, 1:].contiguous().view(-1)[-10:])
self.norm = clip_grad_norm_(self.model.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.parameters(), config.max_grad_norm)
#self.optimizer.step()
self.optimizer.step_and_update_lr()
return loss.item()
def train_one_batch(self, batch):
article_oovs, enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
enc_batch = [outputids2words(ids,self.vocab,article_oovs[i]) for i,ids in enumerate(enc_batch.numpy())]
enc_batch_list = []
for words in enc_batch:
temp_list = []
for w in words:
l = ft_model.get_numpy_vector(w)
temp_list.append(l)
enc_batch_list.append(temp_list)
enc_batch_list = torch.Tensor(enc_batch_list)
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch_list, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
# for i, id in enumerate(y_t_1):
# print (id)
# myid2word(id, self.vocab, article_oovs[i])
y_t_1 = [myid2word(id,self.vocab, article_oovs[i]) for i, id in enumerate(y_t_1.numpy())]
y_t_1 = torch.Tensor([ft_model.get_numpy_vector(w) for w in y_t_1])
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(y_t_1, s_t_1,
encoder_outputs, encoder_feature, enc_padding_mask, c_t_1,
extra_zeros, enc_batch_extend_vocab,
coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1, target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses/dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(), config.max_grad_norm)
self.optimizer.step()
return loss.item()
def eval_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
if not config.is_hierarchical:
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state.forward1(encoder_hidden)
else:
stop_id = self.vocab.word2id('.')
enc_sent_pos = get_sent_position(enc_batch, stop_id)
dec_sent_pos = get_sent_position(dec_batch, stop_id)
encoder_outputs, encoder_feature, encoder_hidden, sent_enc_outputs, sent_enc_feature, sent_enc_hidden, sent_enc_padding_mask = \
self.model.encoder(enc_batch, enc_lens, enc_sent_pos)
s_t_1, sent_s_t_1 = self.model.reduce_state(
encoder_hidden, sent_enc_hidden)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
if not config.is_hierarchical:
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder.forward1(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros,
enc_batch_extend_vocab, coverage, di)
else:
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, enc_sent_pos, encoder_outputs,
encoder_feature, enc_padding_mask, sent_s_t_1,
sent_enc_outputs, sent_enc_feature, sent_enc_padding_mask,
c_t_1, extra_zeros, enc_batch_extend_vocab, coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist,
dim=1,
index=target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_step_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_step_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
return loss.data.item()
def train_one_batch(self, batch, forcing_ratio=1):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, device)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, device)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
y_t_1_hat = None
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di]
# decide the next input
if di == 0 or random.random() < forcing_ratio:
x_t = y_t_1 # teacher forcing, use label from last time step as input
else:
# use embedding of UNK for all oov word
y_t_1_hat[y_t_1_hat > self.vocab.size()] = self.vocab.word2id(
UNKNOWN_TOKEN)
x_t = y_t_1_hat.flatten(
) # use prediction from last time step as input
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
x_t, s_t_1, encoder_outputs, encoder_feature, enc_padding_mask,
c_t_1, extra_zeros, enc_batch_extend_vocab, coverage, di)
_, y_t_1_hat = final_dist.data.topk(1)
target = target_batch[:, di].unsqueeze(1)
step_loss = cal_NLLLoss(target, final_dist)
if config.is_coverage: # if not using coverge, keep coverage=None
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:,
di] # padding in target should not count into loss
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch, it):
# self.change_lr(it)
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
if config.scratchpad:
final_dist, s_t_1, _, attn_dist, p_gen, encoder_outputs = \
self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature, \
enc_padding_mask, c_t_1, extra_zeros, \
enc_batch_extend_vocab, coverage, di \
)
else:
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = \
self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature, \
enc_padding_mask, c_t_1, extra_zeros, \
enc_batch_extend_vocab, coverage, di \
)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1, target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses/dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(), config.max_grad_norm)
if it % config.update_every == 0:
self.optimizer.step()
self.optimizer.zero_grad()
return loss.item()
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
for di in range(min(max_dec_len,
config.max_dec_steps)): # max_dec_steps=100
"""
>>> a=np.array([[1,2,3],[4,5,6]])
>>> a[:,2]
array([3, 6])
>>> a.shape
(2, 3)
"""
y_t_1 = dec_batch[:,
di] # Teacher forcing, the last id of each sample.
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros, enc_batch_extend_vocab,
coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens, self.vocab, batch.art_oovs[0])
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = [] #test
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros, enc_batch_extend_vocab,
coverage, di, self.vocab, batch.art_oovs[0])
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
if config.is_mixed_precision_training:
with amp.scale_loss(loss, self.optimizer) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
#Gradient clipping
if config.is_mixed_precision_training:
torch.nn.utils.clip_grad_norm_(amp.master_params(self.optimizer),
config.max_grad_norm)
else:
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch):
enc_batch,query_enc_batch, enc_padding_mask, query_enc_padding_mask, enc_lens,query_enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_hidden, max_encoder_output = self.model.encoder(
enc_batch, enc_lens)
query_encoder_outputs, query_encoder_hidden, max_query_encoder_output = self.model.query_encoder(
query_enc_batch, query_enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
q_s_t_1 = self.model.query_reduce_state(query_encoder_hidden)
if config.use_maxpool_init_ctx:
c_t_1 = max_encoder_output
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1, attn_dist, p_gen, coverage = self.model.decoder(
y_t_1, s_t_1, q_s_t_1, encoder_outputs, query_encoder_outputs,
enc_padding_mask, query_enc_padding_mask, c_t_1, extra_zeros,
enc_batch_extend_vocab, coverage)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
clip_grad_norm(self.model.encoder.parameters(), config.max_grad_norm)
clip_grad_norm(self.model.query_encoder.parameters(),
config.max_grad_norm)
clip_grad_norm(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm(self.model.reduce_state.parameters(),
config.max_grad_norm)
clip_grad_norm(self.model.query_reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.data[0]
def train_one_batch(self, batch, iter):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch)
self.optimizer.clear_gradients()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di]
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = \
self.model.decoder(y_t_1, s_t_1, encoder_outputs, encoder_feature, enc_padding_mask,
c_t_1, extra_zeros, enc_batch_extend_vocab, coverage, di)
target = target_batch[:, di]
add_index = paddle.arange(0, target.shape[0])
new_index = paddle.stack([add_index, target], axis=1)
gold_probs = paddle.gather_nd(final_dist, new_index).squeeze()
step_loss = -paddle.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = paddle.sum(
paddle.minimum(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = paddle.sum(paddle.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = paddle.mean(batch_avg_loss)
loss.backward()
self.optimizer.minimize(loss)
return loss.numpy()[0]
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1 = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = get_output_from_batch(
batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1, _, _ = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, enc_padding_mask, c_t_1,
extra_zeros, enc_batch_extend_vocab)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_step_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_step_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
clip_grad_norm(self.model.encoder.parameters(), config.max_grad_norm)
clip_grad_norm(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.data[0]
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
# debug(batch.original_articles[0])
# debug(batch.original_abstracts[0])
loss_mask = self.get_loss_mask(enc_batch, dec_batch, batch.absts)
# debug('loss_mask',loss_mask)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage, tau = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros, enc_batch_extend_vocab,
coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
# debug('enc_batch',enc_batch.size())
# debug('dec_batch',dec_batch.size())
# debug('final_dist', final_dist.size())
# debug('target',target)
# debug('gold_probs',gold_probs)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
# debug('step_loss_before',step_loss)
# debug('config.loss_mask',config.loss_mask)
if config.loss_mask:
step_loss = step_loss * loss_mask
# pass
# debug('step_loss_after',step_loss)
step_losses.append(step_loss)
if config.DEBUG:
# break
pass
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
if not config.DEBUG:
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item(), tau
def train_one_batch(self, batch, alpha, beta):
#
# print("BATCH")
# print(batch)
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
#
# print("ENC_BATCH")
# print(len(enc_batch))
# print(len(enc_batch[0]))
# print((enc_batch[0]))
#
# print("enc_padding_mask")
# print(enc_padding_mask)
# print(len(enc_padding_mask))
# print(len(enc_padding_mask[0]))
# print("enc_lens")
# print(enc_lens)
# print("enc_batch_extend_vocab")
# print(enc_batch_extend_vocab)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
# print("encoder_outputs")
# print(encoder_outputs.siz)
s_t_1 = self.model.reduce_state(encoder_hidden)
nll_list = []
# sample_size 是啥？
gen_summary = torch.LongTensor(
config.batch_size * [config.sample_size * [[2]]]) # B x S x 1
# print("gen_summary")
# print(gen_summary.size())
# print(gen_summary)
if use_cuda: gen_summary = gen_summary.cuda()
preds_y = gen_summary.squeeze(2) # B x S
# TODO: Print Gold Here!!!!
# print("preds_y")
# print(preds_y.size())
# print(preds_y)
# print(self.vocab.size())
# print("temp")
# from data import outputids2words
# temp = outputids2words(list(map(lambda x : x.item(), dec_batch[1])),self.vocab,None)
# print(temp)
# # for item in dec_batch[1]:
# # temp = self.vocab.id2word(item.item())
# # from data import outputids2words(dec_batch[1])
# # print(temp)
from data import outputids2words
# print("dec_batch")
# print(dec_batch[0])
# temp = outputids2words(list(map(lambda x : x.item(), dec_batch[0])),self.vocab,None)
# print(temp)
# print()
# print("target_batch")
# print(target_batch[0])
# temp = outputids2words(list(map(lambda x : x.item(), target_batch[0])),self.vocab,None)
# print(temp)
# print()
for di in range(min(config.max_dec_steps, dec_batch.size(1))):
# Select the current input word
p1 = np.random.uniform()
if p1 < alpha: # use ground truth word
y_t_1 = dec_batch[:, di]
else: # use decoded word
y_t_1 = preds_y[:, 0]
# print("y_t_1")
# # print(y_t_1)
# print("dec_batch")
# print(dec_batch)
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros, enc_batch_extend_vocab,
coverage, di)
# Select the current output word
p2 = np.random.uniform()
if p2 < beta: # sample the ground truth word
target = target_batch[:, di]
sampled_batch = torch.stack(config.sample_size * [target],
1) # B x S
else: # randomly sample a word with given probabilities
sampled_batch = torch.multinomial(final_dist,
config.sample_size,
replacement=True) # B x S
# Compute the NLL
probs = torch.gather(final_dist, 1, sampled_batch).squeeze()
step_nll = -torch.log(probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_nll = step_nll + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
nll_list.append(step_nll)
# Store the decoded words in preds_y
preds_y = gen_preds(sampled_batch, use_cuda)
# Add the decoded words into gen_summary (mixed with ground truth and decoded words)
gen_summary = torch.cat((gen_summary, preds_y.unsqueeze(2)),
2) # B x S x L
# compute the REINFORCE score
nll = torch.sum(torch.stack(nll_list, 2), 2) # B x S
all_rewards, avg_reward = compute_reward(batch, gen_summary,
self.vocab, config.mode,
use_cuda) # B x S, 1
batch_loss = torch.sum(nll * all_rewards, dim=1) # B
loss = torch.mean(batch_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item(), avg_reward.item()
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
s_t_1_origin = s_t_1
batch_size = batch.batch_size
step_losses = []
sample_idx = []
sample_log_probs = Variable(torch.zeros(batch_size))
baseline_idx = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing, shape [batch_size]
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(y_t_1, s_t_1,
encoder_outputs,
encoder_feature,
enc_padding_mask, c_t_1,
extra_zeros,
enc_batch_extend_vocab,
coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1, target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
# sample
if di == 0: # use decoder input[0], which is <BOS>
sample_t_1 = dec_batch[:, di]
s_t_sample = s_t_1_origin
c_t_sample = Variable(torch.zeros((batch_size, 2 * config.hidden_dim)))
final_dist, s_t_sample, c_t_sample, attn_dist, p_gen, next_coverage = self.model.decoder(sample_t_1,
s_t_sample,
encoder_outputs,
encoder_feature,
enc_padding_mask,
c_t_sample,
extra_zeros,
enc_batch_extend_vocab,
coverage, di)
# according to final_dist to sample
# change sample_t_1
dist = torch.distributions.Categorical(final_dist)
sample_t_1 = Variable(dist.sample())
# record sample idx
sample_idx.append(sample_t_1) # tensor list
# compute sample probability
sample_log_probs += torch.log(
final_dist.gather(1, sample_t_1.view(-1, 1))) # gather value along axis=1. given index
# baseline
if di == 0: # use decoder input[0], which is <BOS>
baseline_t_1 = dec_batch[:, di]
s_t_sample = s_t_1_origin
c_t_sample = Variable(torch.zeros((batch_size, 2 * config.hidden_dim)))
final_dist, s_t_baseline, c_t_baseline, attn_dist, p_gen, next_coverage = self.model.decoder(baseline_t_1,
s_t_baseline,
encoder_outputs,
encoder_feature,
enc_padding_mask,
c_t_baseline,
extra_zeros,
enc_batch_extend_vocab,
coverage, di)
# according to final_dist to get baseline
# change baseline_t_1
baseline_t_1 = torch.autograd.Variable(final_dist.max(1)) # get max value along axis=1
# record baseline probability
baseline_idx.append(baseline_t_1)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
# according to sample_idx and baseline_idx to compute RL loss
# map sample/baseline_idx to string
# compute rouge score
# compute loss
sample_idx = torch.stack(sample_idx, dim=1).squeeze() # expect shape (batch_size, seq_len)
baseline_idx = torch.stack(baseline_idx, dim=1).squeeze()
rl_loss = torch.zeros(batch_size)
for i in range(sample_idx.shape[0]): # each example in a batch
sample_y = data.outputids2words(sample_idx[i], self.vocab,
(batch.art_oovs[i] if config.pointer_gen else None))
baseline_y = data.outputids2words(baseline_idx[i], self.vocab,
(batch.art_oovs[i] if config.pointer_gen else None))
true_y = batch.original_abstracts[i]
sample_score = rouge_l_f(sample_y, true_y)
baseline_score = rouge_l_f(baseline_y, true_y)
sample_score = Variable(sample_score)
baseline_score = Variable(baseline_score)
rl_loss[i] = baseline_score - sample_score
rl_loss = rl_loss * sample_log_probs
gamma = 0.9984
loss = (1 - gamma) * loss + gamma * rl_loss
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(), config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch, alpha, beta):
# import pdb;
# pdb.set_trace()
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
nll_list = []
gen_summary = torch.LongTensor(
config.batch_size * [config.sample_size * [[2]]]) # B x S x 1
if use_cuda: gen_summary = gen_summary.cuda()
preds_y = gen_summary.squeeze(2) # B x S
for di in range(min(config.max_dec_steps, dec_batch.size(1))):
# Select the current input word
p1 = np.random.uniform()
if p1 < alpha: # use ground truth word
y_t_1 = dec_batch[:, di]
else: # use decoded word
y_t_1 = preds_y[:, 0]
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros, enc_batch_extend_vocab,
coverage, di)
# Select the current output word
p2 = np.random.uniform()
if p2 < beta: # sample the ground truth word
target = target_batch[:, di]
sampled_batch = torch.stack(config.sample_size * [target],
1) # B x S
else: # randomly sample a word with given probabilities
sampled_batch = torch.multinomial(final_dist,
config.sample_size,
replacement=True) # B x S
# Compute the NLL
probs = torch.gather(final_dist, 1, sampled_batch).squeeze()
step_nll = -torch.log(probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_nll = step_nll + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
nll_list.append(step_nll)
# Store the decoded words in preds_y
preds_y = gen_preds(sampled_batch, use_cuda)
# Add the decoded words into gen_summary (mixed with ground truth and decoded words)
gen_summary = torch.cat((gen_summary, preds_y.unsqueeze(2)),
2) # B x S x L
# compute the REINFORCE score
nll = torch.sum(torch.stack(nll_list, 2), 2) # B x S
all_rewards, avg_reward = compute_reward(batch, gen_summary,
self.vocab, config.mode,
use_cuda) # B x S, 1
batch_loss = torch.sum(nll * all_rewards, dim=1) # B
loss = torch.mean(batch_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item(), avg_reward.item()
def eval_one_batch(self, batch):
enc_batch_list, enc_padding_mask_list, enc_lens_list, enc_batch_extend_vocab_list, extra_zeros_list, c_t_1_list, coverage_list = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
encoder_outputs_list = []
encoder_feature_list = []
s_t_1 = None
s_t_1_0 = None
s_t_1_1 = None
for enc_batch, enc_lens in zip(enc_batch_list, enc_lens_list):
sorted_indices = sorted(range(len(enc_lens)),
key=enc_lens.__getitem__)
sorted_indices.reverse()
inverse_sorted_indices = [-1 for _ in range(len(sorted_indices))]
for index, position in enumerate(sorted_indices):
inverse_sorted_indices[position] = index
sorted_enc_batch = torch.index_select(
enc_batch, 0,
torch.LongTensor(sorted_indices)
if not use_cuda else torch.LongTensor(sorted_indices).cuda())
sorted_enc_lens = enc_lens[sorted_indices]
sorted_encoder_outputs, sorted_encoder_feature, sorted_encoder_hidden = self.model.encoder(
sorted_enc_batch, sorted_enc_lens)
encoder_outputs = torch.index_select(
sorted_encoder_outputs, 0,
torch.LongTensor(inverse_sorted_indices) if not use_cuda else
torch.LongTensor(inverse_sorted_indices).cuda())
encoder_feature = torch.index_select(
sorted_encoder_feature.view(encoder_outputs.shape), 0,
torch.LongTensor(inverse_sorted_indices) if not use_cuda else
torch.LongTensor(inverse_sorted_indices).cuda()).view(
sorted_encoder_feature.shape)
encoder_hidden = tuple([
torch.index_select(
sorted_encoder_hidden[0], 1,
torch.LongTensor(inverse_sorted_indices) if not use_cuda
else torch.LongTensor(inverse_sorted_indices).cuda()),
torch.index_select(
sorted_encoder_hidden[1], 1,
torch.LongTensor(inverse_sorted_indices) if not use_cuda
else torch.LongTensor(inverse_sorted_indices).cuda())
])
#encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch, enc_lens)
encoder_outputs_list.append(encoder_outputs)
encoder_feature_list.append(encoder_feature)
if s_t_1 is None:
s_t_1 = self.model.reduce_state(encoder_hidden)
s_t_1_0, s_t_1_1 = s_t_1
else:
s_t_1_new = self.model.reduce_state(encoder_hidden)
s_t_1_0 = s_t_1_0 + s_t_1_new[0]
s_t_1_1 = s_t_1_1 + s_t_1_new[1]
s_t_1 = tuple([s_t_1_0, s_t_1_1])
#encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch, enc_lens)
#s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
target_words = []
output_words = []
id_to_words = {v: k for k, v in self.vocab.word_to_id.iteritems()}
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1_list, attn_dist_list, p_gen, next_coverage_list = self.model.decoder(
y_t_1, s_t_1, encoder_outputs_list, encoder_feature_list,
enc_padding_mask_list, c_t_1_list, extra_zeros_list,
enc_batch_extend_vocab_list, coverage_list, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
output_ids = final_dist.max(1)[1]
output_2_candidates = final_dist.topk(2, 1)[1]
for ind in range(output_ids.shape[0]):
if self.vocab.word_to_id['X'] == output_ids[ind].item():
output_ids[ind] = output_2_candidates[ind][1]
target_step = []
output_step = []
step_mask = dec_padding_mask[:, di]
for i in range(target.shape[0]):
if target[i].item() >= len(id_to_words) or step_mask[i].item(
) == 0:
target[i] = 0
target_step.append(id_to_words[target[i].item()])
if output_ids[i].item() >= len(
id_to_words) or step_mask[i].item() == 0:
output_ids[i] = 0
output_step.append(id_to_words[output_ids[i].item()])
target_words.append(target_step)
output_words.append(output_step)
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
#step_coverage_loss = torch.sum(torch.min(attn_dist, coverage), 1)
#step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
#coverage = next_coverage
step_coverage_loss = 0.0
for ind in range(len(coverage_list)):
step_coverage_loss += torch.sum(
torch.min(attn_dist_list[ind], coverage_list[ind]), 1)
coverage_list[ind] = next_coverage_list[ind]
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
self.write_words(output_words, "output.txt")
self.write_words(target_words, "input.txt")
sum_step_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_step_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
return loss.item()
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
if self.opt.train_mle == "yes":
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros,
enc_batch_extend_vocab, coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(
torch.min(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
mle_loss = torch.mean(batch_avg_loss)
else:
mle_loss = get_cuda(torch.FloatTensor([0]))
# --------------RL training-----------------------------------------------------
if self.opt.train_rl == "yes": # perform reinforcement learning training
# multinomial sampling
sample_sents, RL_log_probs = self.train_batch_RL(
encoder_outputs,
encoder_hidden,
enc_padding_mask,
encoder_feature,
enc_batch_extend_vocab,
extra_zeros,
c_t_1,
batch.art_oovs,
coverage,
greedy=False)
with torch.autograd.no_grad():
# greedy sampling
greedy_sents, _ = self.train_batch_RL(encoder_outputs,
encoder_hidden,
enc_padding_mask,
encoder_feature,
enc_batch_extend_vocab,
extra_zeros,
c_t_1,
batch.art_oovs,
coverage,
greedy=True)
sample_reward = self.reward_function(sample_sents,
batch.original_abstracts)
baseline_reward = self.reward_function(greedy_sents,
batch.original_abstracts)
# if iter%200 == 0:
# self.write_to_file(sample_sents, greedy_sents, batch.original_abstracts, sample_reward, baseline_reward, iter)
rl_loss = -(
sample_reward - baseline_reward
) * RL_log_probs # Self-critic policy gradient training (eq 15 in https://arxiv.org/pdf/1705.04304.pdf)
rl_loss = torch.mean(rl_loss)
batch_reward = torch.mean(sample_reward).item()
else:
rl_loss = get_cuda(torch.FloatTensor([0]))
batch_reward = 0
#loss.backward()
(self.opt.mle_weight * mle_loss +
self.opt.rl_weight * rl_loss).backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return mle_loss.item(), batch_reward
def train_one_batch(self, batch):
enc_batch_list, enc_padding_mask_list, enc_lens_list, enc_batch_extend_vocab_list, extra_zeros_list, c_t_1_list, coverage_list = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs_list = []
encoder_feature_list = []
s_t_1 = None
s_t_1_0 = None
s_t_1_1 = None
for enc_batch, enc_lens in zip(enc_batch_list, enc_lens_list):
sorted_indices = sorted(range(len(enc_lens)),
key=enc_lens.__getitem__)
sorted_indices.reverse()
inverse_sorted_indices = [-1 for _ in range(len(sorted_indices))]
for index, position in enumerate(sorted_indices):
inverse_sorted_indices[position] = index
sorted_enc_batch = torch.index_select(
enc_batch, 0,
torch.LongTensor(sorted_indices)
if not use_cuda else torch.LongTensor(sorted_indices).cuda())
sorted_enc_lens = enc_lens[sorted_indices]
sorted_encoder_outputs, sorted_encoder_feature, sorted_encoder_hidden = self.model.encoder(
sorted_enc_batch, sorted_enc_lens)
encoder_outputs = torch.index_select(
sorted_encoder_outputs, 0,
torch.LongTensor(inverse_sorted_indices) if not use_cuda else
torch.LongTensor(inverse_sorted_indices).cuda())
encoder_feature = torch.index_select(
sorted_encoder_feature.view(encoder_outputs.shape), 0,
torch.LongTensor(inverse_sorted_indices) if not use_cuda else
torch.LongTensor(inverse_sorted_indices).cuda()).view(
sorted_encoder_feature.shape)
encoder_hidden = tuple([
torch.index_select(
sorted_encoder_hidden[0], 1,
torch.LongTensor(inverse_sorted_indices) if not use_cuda
else torch.LongTensor(inverse_sorted_indices).cuda()),
torch.index_select(
sorted_encoder_hidden[1], 1,
torch.LongTensor(inverse_sorted_indices) if not use_cuda
else torch.LongTensor(inverse_sorted_indices).cuda())
])
#encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch, enc_lens)
encoder_outputs_list.append(encoder_outputs)
encoder_feature_list.append(encoder_feature)
if s_t_1 is None:
s_t_1 = self.model.reduce_state(encoder_hidden)
s_t_1_0, s_t_1_1 = s_t_1
else:
s_t_1_new = self.model.reduce_state(encoder_hidden)
s_t_1_0 = s_t_1_0 + s_t_1_new[0]
s_t_1_1 = s_t_1_1 + s_t_1_new[1]
s_t_1 = tuple([s_t_1_0, s_t_1_1])
#c_t_1_list = [c_t_1]
#coverage_list = [coverage]
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1_list, attn_dist_list, p_gen, next_coverage_list = self.model.decoder(
y_t_1, s_t_1, encoder_outputs_list, encoder_feature_list,
enc_padding_mask_list, c_t_1_list, extra_zeros_list,
enc_batch_extend_vocab_list, coverage_list, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = 0.0
for ind in range(len(coverage_list)):
step_coverage_loss += torch.sum(
torch.min(attn_dist_list[ind], coverage_list[ind]), 1)
coverage_list[ind] = next_coverage_list[ind]
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch, steps, batch_ds):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, enc_batch_concept_extend_vocab, concept_p, position, concept_mask, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
enc_batch_ds, enc_padding_mask_ds, enc_lens_ds, _, _, _, _, _, _, _, _ = \
get_input_from_batch(batch_ds, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_hidden, max_encoder_output, enc_batch_ds_emb, dec_batch_emb = self.model.encoder(
enc_batch, enc_lens, enc_batch_ds, dec_batch)
if config.DS_train:
ds_final_loss = self.ds_loss(enc_batch_ds_emb, enc_padding_mask_ds,
dec_batch_emb, dec_padding_mask)
s_t_1 = self.model.reduce_state(encoder_hidden)
s_t_0 = s_t_1
c_t_0 = c_t_1
if config.use_maxpool_init_ctx:
c_t_1 = max_encoder_output
c_t_0 = c_t_1
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di]
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
'train', y_t_1, s_t_1, encoder_outputs, enc_padding_mask,
c_t_1, extra_zeros, enc_batch_extend_vocab,
enc_batch_concept_extend_vocab, concept_p, position,
concept_mask, coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
if config.DS_train:
ds_final_loss = Variable(torch.FloatTensor([ds_final_loss]),
requires_grad=False)
ds_final_loss = ds_final_loss.cuda()
loss = (config.pi - ds_final_loss) * torch.mean(batch_avg_loss)
else:
loss = torch.mean(batch_avg_loss)
if steps > config.traintimes:
scores = []
sample_y = []
s_t_1 = s_t_0
c_t_1 = c_t_0
for di in range(min(max_dec_len, config.max_dec_steps)):
if di == 0:
y_t_1 = dec_batch[:, di]
sample_y.append(y_t_1.cpu().numpy().tolist())
else:
sample_latest_tokens = sample_y[-1]
sample_latest_tokens = [t if t < self.vocab.size() else self.vocab.word2id(data.UNKNOWN_TOKEN) \
for t in sample_latest_tokens]
y_t_1 = Variable(torch.LongTensor(sample_latest_tokens))
y_t_1 = y_t_1.cuda()
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
'train', y_t_1, s_t_1, encoder_outputs, enc_padding_mask,
c_t_1, extra_zeros, enc_batch_extend_vocab,
enc_batch_concept_extend_vocab, concept_p, position,
concept_mask, coverage, di)
sample_select = torch.multinomial(final_dist, 1).view(-1)
sample_log_probs = torch.gather(
final_dist, 1, sample_select.unsqueeze(1)).squeeze()
sample_y.append(sample_select.cpu().numpy().tolist())
sample_step_loss = -torch.log(sample_log_probs + config.eps)
sample_step_mask = dec_padding_mask[:, di]
sample_step_loss = sample_step_loss * sample_step_mask
scores.append(sample_step_loss)
sample_sum_losses = torch.sum(torch.stack(scores, 1), 1)
sample_batch_avg_loss = sample_sum_losses / dec_lens_var
sample_y = np.transpose(sample_y).tolist()
base_y = []
s_t_1 = s_t_0
c_t_1 = c_t_0
for di in range(min(max_dec_len, config.max_dec_steps)):
if di == 0:
y_t_1 = dec_batch[:, di]
base_y.append(y_t_1.cpu().numpy().tolist())
else:
base_latest_tokens = base_y[-1]
base_latest_tokens = [t if t < self.vocab.size() else self.vocab.word2id(data.UNKNOWN_TOKEN) \
for t in base_latest_tokens]
y_t_1 = Variable(torch.LongTensor(base_latest_tokens))
y_t_1 = y_t_1.cuda()
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
'train', y_t_1, s_t_1, encoder_outputs, enc_padding_mask,
c_t_1, extra_zeros, enc_batch_extend_vocab,
enc_batch_concept_extend_vocab, concept_p, position,
concept_mask, coverage, di)
base_log_probs, base_ids = torch.topk(final_dist, 1)
base_y.append(base_ids[:, 0].cpu().numpy().tolist())
base_y = np.transpose(base_y).tolist()
refs = dec_batch.cpu().numpy().tolist()
sample_dec_lens_var = map(int, dec_lens_var.cpu().numpy().tolist())
sample_rougeL = [
self.calc_Rouge_L(sample[:reflen],
ref[:reflen]) for sample, ref, reflen in zip(
sample_y, refs, sample_dec_lens_var)
]
base_rougeL = [
self.calc_Rouge_L(base[:reflen], ref[:reflen])
for base, ref, reflen in zip(base_y, refs, sample_dec_lens_var)
]
sample_rougeL = Variable(torch.FloatTensor(sample_rougeL),
requires_grad=False)
base_rougeL = Variable(torch.FloatTensor(base_rougeL),
requires_grad=False)
sample_rougeL = sample_rougeL.cuda()
base_rougeL = base_rougeL.cuda()
word_loss = -sample_batch_avg_loss * (base_rougeL - sample_rougeL)
reinforce_loss = torch.mean(word_loss)
loss = (1 - config.rein) * loss + config.rein * reinforce_loss
loss.backward()
clip_grad_norm(self.model.encoder.parameters(), config.max_grad_norm)
clip_grad_norm(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.data[0]
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
if not config.is_hierarchical:
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch, enc_lens)
s_t_1 = self.model.reduce_state.forward1(encoder_hidden)
else:
stop_id = self.vocab.word2id('.')
pad_id = self.vocab.word2id('[PAD]')
enc_sent_pos = get_sent_position(enc_batch, stop_id, pad_id)
dec_sent_pos = get_sent_position(dec_batch, stop_id, pad_id)
encoder_outputs, encoder_feature, encoder_hidden, sent_enc_outputs, sent_enc_feature, sent_enc_hidden, sent_enc_padding_mask, sent_lens, seq_lens2 = \
self.model.encoder(enc_batch, enc_lens, enc_sent_pos)
s_t_1, sent_s_t_1 = self.model.reduce_state(encoder_hidden, sent_enc_hidden)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
if not config.is_hierarchical:
# start = datetime.now()
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder.forward1(y_t_1, s_t_1,
encoder_outputs, encoder_feature, enc_padding_mask, c_t_1,
extra_zeros, enc_batch_extend_vocab,
coverage, di)
# print('NO HIER Time: ',datetime.now() - start)
# import pdb; pdb.set_trace()
else:
# start = datetime.now()
max_doc_len = enc_batch.size(1)
final_dist, sent_s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(y_t_1, sent_s_t_1,
encoder_outputs, encoder_feature, enc_padding_mask, seq_lens2,
sent_s_t_1, sent_enc_outputs, sent_enc_feature, sent_enc_padding_mask,
sent_lens, max_doc_len,
c_t_1, extra_zeros, enc_batch_extend_vocab, coverage, di)
# print('DO HIER Time: ',datetime.now() - start)
# import pdb; pdb.set_trace()
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1, target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses/dec_lens_var
loss = torch.mean(batch_avg_loss)
# start = datatime.now()
loss.backward()
# print('{} HIER Time: {}'.format(config.is_hierarchical ,datetime.now() - start))
# import pdb; pdb.set_trace()
clip_grad_norm_(self.model.encoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(), config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage, enc_aspects = get_input_from_batch(
batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch, dec_aspects = get_output_from_batch(
batch, use_cuda)
"""
dec_aspects and enc_aspects are a lists of aspects
"""
aspect_ids = [int(aspect[0]) for aspect in enc_aspects]
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens, aspect_ids)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros, enc_batch_extend_vocab,
coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch):
loss = 0
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
# print("Encoding lengths", enc_lens) #(1,8)
# print("Encoding batch", enc_batch.size()) #(8, 400)
# print("c_t_1 is ", c_t_1.size()) # (8, 512)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
# print("Max Decoding lengths", max_dec_len)
# print("Decoding lengths", dec_lens_var)
# print("Decoding vectors", dec_batch[0])
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch, enc_lens)
# print("encoder_outputs", encoder_outputs.size()) # (8, 400, 512)
# print("encoder_feature", encoder_feature.size()) # (3200, 512)
# print("encoder_hidden", encoder_hidden[1].size()) # (2, 8, 256)
s_t_1 = self.model.reduce_state(encoder_hidden) # (1, 8, 256)
# print("After reduce_state, the hidden state s_t_1 is", s_t_1[0].size())
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
# print("Decoder step = ", di)
y_t_1 = dec_batch[:, di] # Teacher forcing # the dith word of all the examples/targets in a batch of shape (8,)
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(y_t_1, s_t_1,
encoder_outputs, encoder_feature, enc_padding_mask, c_t_1,
extra_zeros, enc_batch_extend_vocab,
coverage, di)
# print("for di=", di, " final_dist", final_dist.size()) # (8, 50009)
# print("for di=", di, " s_t_1", encoder_feature.size()) # (3200, 512)
# print("for di=", di, " c_t_1", c_t_1.size()) # (8, 512)
# print("for di=", di, " attn_dist", attn_dist.size()) # (8, 400)
# print("for di=", di, " p_gen", p_gen.size()) # (8, 1)
# print("for di=", di, " next_coverage", next_coverage.size())
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1, target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses/dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(), config.max_grad_norm) # gradient clipping
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(), config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
# encoder_outputs shape = (batch_size, max_seq_len, 2*hidden_size)
# encoder_feature shape = (batch_size*max_seq_len, 2*hidden_size)
# encoder_hidden[0] shape = (batch, 2, hidden_size)
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
# s_t_1[0] shape = (1, batch_size, hidden_size)
s_t_1 = self.model.reduce_state(encoder_hidden)
'''
print('Actual enc_batch:')
en_words = [self.vocab._id_to_word[idx] for idx in enc_batch[0].numpy()]
print(en_words)
print('Actual de_batch:')
de_words = [self.vocab._id_to_word[idx] for idx in dec_batch[0].numpy()]
print(de_words)
print('Actual tar_batch:')
tar_words = [self.vocab._id_to_word[idx] for idx in target_batch[0].numpy()]
print(tar_words)
'''
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros, enc_batch_extend_vocab,
coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch):
########### Below Two lines of code is for just initialization of Encoder and Decoder sizes,vocab, lenghts etc : ######
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
#print("train_one_batch function ......")
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(
enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(
encoder_hidden
) ### Here initially encoder final hiddenstate==decoder first/prev word at timestamp=0
#print("s_t_1 : ",len(s_t_1),s_t_1[0].shape,s_t_1[1].shape)
#print("steps.....")
#print("max_dec_len = ",max_dec_len)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
############ Traing [ Teacher Forcing ] ###########
y_t_1 = dec_batch[:, di] # Teacher forcing
#print("y_t_1 : ",len(y_t_1))
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature,
enc_padding_mask, c_t_1, extra_zeros, enc_batch_extend_vocab,
coverage, di)
#print("attn_dist : ",len(attn_dist),attn_dist[0].shape)
#print("final_dist : ",len(final_dist),final_dist[0].shape) ############## vocab_Size
target = target_batch[:, di]
#print("target = ",len(target))
gold_probs = torch.gather(final_dist, 1,
target.unsqueeze(1)).squeeze()
step_loss = -torch.log(
gold_probs + config.eps
) #################################################### Eqn_6
if config.is_coverage:
step_coverage_loss = torch.sum(
torch.min(attn_dist, coverage),
1) ###############################Eqn_13a
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss ###############################Eqn_13b
coverage = next_coverage
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(),
config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(),
config.max_grad_norm)
self.optimizer.step()
return loss.item()
def train_one_batch(self, batch):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, c_t_1, coverage = \
get_input_from_batch(batch, use_cuda)
dec_batch, dec_padding_mask, max_dec_len, dec_lens_var, target_batch = \
get_output_from_batch(batch, use_cuda)
self.optimizer.zero_grad()
encoder_outputs, encoder_feature, encoder_hidden = self.model.encoder(enc_batch, enc_lens)
s_t_1 = self.model.reduce_state(encoder_hidden)
step_losses = []
for di in range(min(max_dec_len, config.max_dec_steps)):
y_t_1 = dec_batch[:, di] # Teacher forcing
final_dist, s_t_1, c_t_1, attn_dist, p_gen, next_coverage = self.model.decoder(y_t_1, s_t_1,
encoder_outputs, encoder_feature, enc_padding_mask, c_t_1,
extra_zeros, enc_batch_extend_vocab,
coverage, di)
target = target_batch[:, di]
gold_probs = torch.gather(final_dist, 1, target.unsqueeze(1)).squeeze()
step_loss = -torch.log(gold_probs + config.eps)
if config.is_coverage:
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage), 1)
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
coverage = next_coverage
# calculate copy loss
vocab_zero = Variable(torch.zeros(self.model.decoder.vocab_dist_.shape, dtype=torch.float))
if use_cuda:
vocab_zero = vocab_zero.cuda()
if extra_zeros is not None:
vocab_zero = torch.cat([vocab_zero, extra_zeros], 1)
attn_dist_ = (1 - p_gen) * attn_dist
attn_expanded = vocab_zero.scatter_add(1, enc_batch_extend_vocab, attn_dist_)
vocab_zero[:, self.vocab.word2id('[UNK]')] = 1.0
# Not sure whether we want to add loss for the extra vocab indices
#vocab_zero[:, config.vocab_size:] = 1.0
y_unk_neg = 1.0 - vocab_zero
copyloss=torch.bmm(y_unk_neg.unsqueeze(1), attn_expanded.unsqueeze(2))
# add copy loss with lambda 2 weight
step_loss = step_loss + config.copy_loss_wt * copyloss
step_mask = dec_padding_mask[:, di]
step_loss = step_loss * step_mask
step_losses.append(step_loss)
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses/dec_lens_var
loss = torch.mean(batch_avg_loss)
loss.backward()
self.norm = clip_grad_norm_(self.model.encoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.decoder.parameters(), config.max_grad_norm)
clip_grad_norm_(self.model.reduce_state.parameters(), config.max_grad_norm)
self.optimizer.step()
return loss.item()
