class CvaeTrans(nn.Module):
def __init__(self,
vocab,
emo_number,
model_file_path=None,
is_eval=False,
load_optim=False):
super(CvaeTrans, self).__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, config.pretrain_emb)
self.encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
self.r_encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
self.decoder = Decoder(config.emb_dim,
hidden_size=config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter)
self.latent_layer = Latent(is_eval)
self.bow = SoftmaxOutputLayer(config.hidden_dim, self.vocab_size)
if config.multitask:
self.emo = SoftmaxOutputLayer(config.hidden_dim, emo_number)
self.emo_criterion = nn.NLLLoss()
self.generator = Generator(config.hidden_dim, self.vocab_size)
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
if model_file_path is not None:
print("loading weights")
state = torch.load(model_file_path,
map_location=lambda storage, location: storage)
self.encoder.load_state_dict(state['encoder_state_dict'])
self.r_encoder.load_state_dict(state['r_encoder_state_dict'])
self.decoder.load_state_dict(state['decoder_state_dict'])
self.generator.load_state_dict(state['generator_dict'])
self.embedding.load_state_dict(state['embedding_dict'])
self.latent_layer.load_state_dict(state['latent_dict'])
self.bow.load_state_dict(state['bow'])
if (config.USE_CUDA):
self.cuda()
if is_eval:
self.eval()
else:
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if (config.noam):
self.optimizer = NoamOpt(
config.hidden_dim, 1, 8000,
torch.optim.Adam(self.parameters(),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
if (load_optim):
self.optimizer.load_state_dict(state['optimizer'])
if config.USE_CUDA:
for state in self.optimizer.state.values():
for k, v in state.items():
if isinstance(v, torch.Tensor):
state[k] = v.cuda()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
def save_model(self, running_avg_ppl, iter, f1_g, f1_b, ent_g, ent_b):
state = {
'iter': iter,
'encoder_state_dict': self.encoder.state_dict(),
'r_encoder_state_dict': self.r_encoder.state_dict(),
'decoder_state_dict': self.decoder.state_dict(),
'generator_dict': self.generator.state_dict(),
'embedding_dict': self.embedding.state_dict(),
'latent_dict': self.latent_layer.state_dict(),
'bow': self.bow.state_dict(),
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl
}
model_save_path = os.path.join(
self.model_dir,
'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(
iter, running_avg_ppl, f1_g, f1_b, ent_g, ent_b))
self.best_path = model_save_path
torch.save(state, model_save_path)
def train_one_batch(self, batch, iter, train=True):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
dec_batch, _, _, _, _ = get_output_from_batch(batch)
if (config.noam):
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
## Response encode
mask_res = batch["posterior_batch"].data.eq(
config.PAD_idx).unsqueeze(1)
posterior_mask = self.embedding(batch["posterior_mask"])
r_encoder_outputs = self.r_encoder(
self.embedding(batch["posterior_batch"]) + posterior_mask,
mask_res)
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["input_mask"])
encoder_outputs = self.encoder(
self.embedding(enc_batch) + emb_mask, mask_src)
#latent variable
if config.model == "cvaetrs":
kld_loss, z = self.latent_layer(encoder_outputs[:, 0],
r_encoder_outputs[:, 0],
train=True)
meta = self.embedding(batch["program_label"])
if config.dataset == "empathetic":
meta = meta - meta
# Decode
sos_token = torch.LongTensor([config.SOS_idx] *
enc_batch.size(0)).unsqueeze(1)
if config.USE_CUDA: sos_token = sos_token.cuda()
dec_batch_shift = torch.cat((sos_token, dec_batch[:, :-1]),
1) #(batch, len, embedding)
mask_trg = dec_batch_shift.data.eq(config.PAD_idx).unsqueeze(1)
input_vector = self.embedding(dec_batch_shift)
if config.model == "cvaetrs":
input_vector[:, 0] = input_vector[:, 0] + z + meta
else:
input_vector[:, 0] = input_vector[:, 0] + meta
pre_logit, attn_dist = self.decoder(input_vector, encoder_outputs,
(mask_src, mask_trg))
## compute output dist
logit = self.generator(
pre_logit,
attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros,
attn_dist_db=None)
## loss: NNL if ptr else Cross entropy
loss_rec = self.criterion(logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1))
if config.model == "cvaetrs":
z_logit = self.bow(z + meta) # [batch_size, vocab_size]
z_logit = z_logit.unsqueeze(1).repeat(1, logit.size(1), 1)
loss_aux = self.criterion(
z_logit.contiguous().view(-1, z_logit.size(-1)),
dec_batch.contiguous().view(-1))
if config.multitask:
emo_logit = self.emo(encoder_outputs[:, 0])
emo_loss = self.emo_criterion(emo_logit,
batch["program_label"] - 9)
#kl_weight = min(iter/config.full_kl_step, 0.28) if config.full_kl_step >0 else 1.0
kl_weight = min(
math.tanh(6 * iter / config.full_kl_step - 3) + 1, 1)
loss = loss_rec + config.kl_ceiling * kl_weight * kld_loss + config.aux_ceiling * loss_aux
if config.multitask:
loss = loss_rec + config.kl_ceiling * kl_weight * kld_loss + config.aux_ceiling * loss_aux + emo_loss
aux = loss_aux.item()
elbo = loss_rec + kld_loss
else:
loss = loss_rec
elbo = loss_rec
kld_loss = torch.Tensor([0])
aux = 0
if config.multitask:
emo_logit = self.emo(encoder_outputs[:, 0])
emo_loss = self.emo_criterion(emo_logit,
batch["program_label"] - 9)
loss = loss_rec + emo_loss
if (train):
loss.backward()
# clip gradient
nn.utils.clip_grad_norm_(self.parameters(), config.max_grad_norm)
self.optimizer.step()
return loss_rec.item(), math.exp(min(
loss_rec.item(), 100)), kld_loss.item(), aux, elbo.item()
def decoder_greedy(self, batch, max_dec_step=50):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["input_mask"])
meta = self.embedding(batch["program_label"])
if config.dataset == "empathetic":
meta = meta - meta
encoder_outputs = self.encoder(
self.embedding(enc_batch) + emb_mask, mask_src)
if config.model == "cvaetrs":
kld_loss, z = self.latent_layer(encoder_outputs[:, 0],
None,
train=False)
ys = torch.ones(enc_batch.shape[0], 1).fill_(config.SOS_idx).long()
if config.USE_CUDA:
ys = ys.cuda()
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
decoded_words = []
for i in range(max_dec_step + 1):
input_vector = self.embedding(ys)
if config.model == "cvaetrs":
input_vector[:, 0] = input_vector[:, 0] + z + meta
else:
input_vector[:, 0] = input_vector[:, 0] + meta
out, attn_dist = self.decoder(input_vector, encoder_outputs,
(mask_src, mask_trg))
prob = self.generator(out,
attn_dist,
enc_batch_extend_vocab,
extra_zeros,
attn_dist_db=None)
_, next_word = torch.max(prob[:, -1], dim=1)
decoded_words.append([
'<EOS>' if ni.item() == config.EOS_idx else
self.vocab.index2word[ni.item()] for ni in next_word.view(-1)
])
if config.USE_CUDA:
ys = torch.cat([ys, next_word.unsqueeze(1)], dim=1)
ys = ys.cuda()
else:
ys = torch.cat([ys, next_word.unsqueeze(1)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>': break
else: st += e + ' '
sent.append(st)
return sent
class Transformer_experts(nn.Module):
def __init__(self,
vocab,
decoder_number,
model_file_path=None,
is_eval=False,
load_optim=False):
super(Transformer_experts, self).__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, config.pretrain_emb)
self.encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
self.decoder_number = decoder_number
## multiple decoders
self.decoder = MulDecoder(decoder_number,
config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter)
self.decoder_key = nn.Linear(config.hidden_dim,
decoder_number,
bias=False)
self.generator = Generator(config.hidden_dim, self.vocab_size)
self.emoji_embedding = nn.Linear(64, config.emb_dim, bias=False)
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
if (config.label_smoothing):
self.criterion = LabelSmoothing(size=self.vocab_size,
padding_idx=config.PAD_idx,
smoothing=0.1)
self.criterion_ppl = nn.NLLLoss(ignore_index=config.PAD_idx)
if config.softmax:
self.attention_activation = nn.Softmax(dim=1)
else:
self.attention_activation = nn.Sigmoid() #nn.Softmax()
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if (config.noam):
self.optimizer = NoamOpt(
config.hidden_dim, 1, 8000,
torch.optim.Adam(self.parameters(),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
if model_file_path is not None:
print("loading weights")
state = torch.load(model_file_path,
map_location=lambda storage, location: storage)
self.encoder.load_state_dict(state['encoder_state_dict'])
self.decoder.load_state_dict(state['decoder_state_dict'])
self.decoder_key.load_state_dict(state['decoder_key_state_dict'])
#self.emoji_embedding.load_state_dict(state['emoji_embedding_dict'])
self.generator.load_state_dict(state['generator_dict'])
self.embedding.load_state_dict(state['embedding_dict'])
if (load_optim):
self.optimizer.load_state_dict(state['optimizer'])
self.eval()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
def save_model(self, running_avg_ppl, iter, f1_g, f1_b, ent_g, ent_b):
state = {
'iter': iter,
'encoder_state_dict': self.encoder.state_dict(),
'decoder_state_dict': self.decoder.state_dict(),
'decoder_key_state_dict': self.decoder_key.state_dict(),
#'emoji_embedding_dict': self.emoji_embedding.state_dict(),
'generator_dict': self.generator.state_dict(),
'embedding_dict': self.embedding.state_dict(),
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl
}
model_save_path = os.path.join(
self.model_dir,
'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(
iter, running_avg_ppl, f1_g, f1_b, ent_g, ent_b))
self.best_path = model_save_path
torch.save(state, model_save_path)
def train_one_batch(self, batch, iter, train=True):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
dec_batch, _, _, _, _ = get_output_from_batch(batch)
if (config.noam):
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
if config.dataset == "empathetic":
emb_mask = self.embedding(batch["mask_input"])
encoder_outputs = self.encoder(
self.embedding(enc_batch) + emb_mask, mask_src)
else:
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
## Attention over decoder
q_h = torch.mean(encoder_outputs,
dim=1) if config.mean_query else encoder_outputs[:, 0]
#q_h = encoder_outputs[:,0]
logit_prob = self.decoder_key(q_h) #(bsz, num_experts)
if (config.topk > 0):
k_max_value, k_max_index = torch.topk(logit_prob, config.topk)
a = np.empty([logit_prob.shape[0], self.decoder_number])
a.fill(float('-inf'))
mask = torch.Tensor(a).cuda()
logit_prob_ = mask.scatter_(1,
k_max_index.cuda().long(), k_max_value)
attention_parameters = self.attention_activation(logit_prob_)
else:
attention_parameters = self.attention_activation(logit_prob)
# print("===============================================================================")
# print("listener attention weight:",attention_parameters.data.cpu().numpy())
# print("===============================================================================")
if (config.oracle):
attention_parameters = self.attention_activation(
torch.FloatTensor(batch['target_program']) * 1000).cuda()
attention_parameters = attention_parameters.unsqueeze(-1).unsqueeze(
-1) # (batch_size, expert_num, 1, 1)
# Decode
sos_token = torch.LongTensor([config.SOS_idx] *
enc_batch.size(0)).unsqueeze(1)
if config.USE_CUDA: sos_token = sos_token.cuda()
dec_batch_shift = torch.cat((sos_token, dec_batch[:, :-1]), 1)
mask_trg = dec_batch_shift.data.eq(config.PAD_idx).unsqueeze(1)
pre_logit, attn_dist = self.decoder(self.embedding(dec_batch_shift),
encoder_outputs,
(mask_src, mask_trg),
attention_parameters)
## compute output dist
logit = self.generator(
pre_logit,
attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros,
attn_dist_db=None)
#logit = F.log_softmax(logit,dim=-1) #fix the name later
## loss: NNL if ptr else Cross entropy
if (train and config.schedule > 10):
if (random.uniform(0, 1) <=
(0.0001 +
(1 - 0.0001) * math.exp(-1. * iter / config.schedule))):
config.oracle = True
else:
config.oracle = False
if config.softmax:
loss = self.criterion(
logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1)) + nn.CrossEntropyLoss()(
logit_prob, torch.LongTensor(
batch['program_label']).cuda())
loss_bce_program = nn.CrossEntropyLoss()(
logit_prob,
torch.LongTensor(batch['program_label']).cuda()).item()
else:
loss = self.criterion(
logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1)) + nn.BCEWithLogitsLoss()(
logit_prob, torch.FloatTensor(
batch['target_program']).cuda())
loss_bce_program = nn.BCEWithLogitsLoss()(
logit_prob,
torch.FloatTensor(batch['target_program']).cuda()).item()
pred_program = np.argmax(logit_prob.detach().cpu().numpy(), axis=1)
program_acc = accuracy_score(batch["program_label"], pred_program)
if (config.label_smoothing):
loss_ppl = self.criterion_ppl(
logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1)).item()
if (train):
loss.backward()
self.optimizer.step()
if (config.label_smoothing):
return loss_ppl, math.exp(min(loss_ppl,
100)), loss_bce_program, program_acc
else:
return loss.item(), math.exp(min(
loss.item(), 100)), loss_bce_program, program_acc
def compute_act_loss(self, module):
R_t = module.remainders
N_t = module.n_updates
p_t = R_t + N_t
avg_p_t = torch.sum(torch.sum(p_t, dim=1) / p_t.size(1)) / p_t.size(0)
loss = config.act_loss_weight * avg_p_t.item()
return loss
def decoder_greedy(self, batch, max_dec_step=30):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["mask_input"])
encoder_outputs = self.encoder(
self.embedding(enc_batch) + emb_mask, mask_src)
## Attention over decoder
q_h = torch.mean(encoder_outputs,
dim=1) if config.mean_query else encoder_outputs[:, 0]
#q_h = encoder_outputs[:,0]
logit_prob = self.decoder_key(q_h)
if (config.topk > 0):
k_max_value, k_max_index = torch.topk(logit_prob, config.topk)
a = np.empty([logit_prob.shape[0], self.decoder_number])
a.fill(float('-inf'))
mask = torch.Tensor(a).cuda()
logit_prob = mask.scatter_(1,
k_max_index.cuda().long(), k_max_value)
attention_parameters = self.attention_activation(logit_prob)
if (config.oracle):
attention_parameters = self.attention_activation(
torch.FloatTensor(batch['target_program']) * 1000).cuda()
attention_parameters = attention_parameters.unsqueeze(-1).unsqueeze(
-1) # (batch_size, expert_num, 1, 1)
ys = torch.ones(1, 1).fill_(config.SOS_idx).long()
if config.USE_CUDA:
ys = ys.cuda()
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
decoded_words = []
for i in range(max_dec_step + 1):
if (config.project):
out, attn_dist = self.decoder(
self.embedding_proj_in(self.embedding(ys)),
self.embedding_proj_in(encoder_outputs),
(mask_src, mask_trg), attention_parameters)
else:
out, attn_dist = self.decoder(self.embedding(ys),
encoder_outputs,
(mask_src, mask_trg),
attention_parameters)
logit = self.generator(out,
attn_dist,
enc_batch_extend_vocab,
extra_zeros,
attn_dist_db=None)
#logit = F.log_softmax(logit,dim=-1) #fix the name later
_, next_word = torch.max(logit[:, -1], dim=1)
decoded_words.append([
'<EOS>' if ni.item() == config.EOS_idx else
self.vocab.index2word[ni.item()] for ni in next_word.view(-1)
])
next_word = next_word.data[0]
if config.USE_CUDA:
ys = torch.cat(
[ys, torch.ones(1, 1).long().fill_(next_word).cuda()],
dim=1)
ys = ys.cuda()
else:
ys = torch.cat(
[ys, torch.ones(1, 1).long().fill_(next_word)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>': break
else: st += e + ' '
sent.append(st)
return sent
def decoder_topk(self, batch, max_dec_step=30):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["mask_input"])
encoder_outputs = self.encoder(
self.embedding(enc_batch) + emb_mask, mask_src)
## Attention over decoder
q_h = torch.mean(encoder_outputs,
dim=1) if config.mean_query else encoder_outputs[:, 0]
#q_h = encoder_outputs[:,0]
logit_prob = self.decoder_key(q_h)
if (config.topk > 0):
k_max_value, k_max_index = torch.topk(logit_prob, config.topk)
a = np.empty([logit_prob.shape[0], self.decoder_number])
a.fill(float('-inf'))
mask = torch.Tensor(a).cuda()
logit_prob = mask.scatter_(1,
k_max_index.cuda().long(), k_max_value)
attention_parameters = self.attention_activation(logit_prob)
if (config.oracle):
attention_parameters = self.attention_activation(
torch.FloatTensor(batch['target_program']) * 1000).cuda()
attention_parameters = attention_parameters.unsqueeze(-1).unsqueeze(
-1) # (batch_size, expert_num, 1, 1)
ys = torch.ones(1, 1).fill_(config.SOS_idx).long()
if config.USE_CUDA:
ys = ys.cuda()
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
decoded_words = []
for i in range(max_dec_step + 1):
if (config.project):
out, attn_dist = self.decoder(
self.embedding_proj_in(self.embedding(ys)),
self.embedding_proj_in(encoder_outputs),
(mask_src, mask_trg), attention_parameters)
else:
out, attn_dist = self.decoder(self.embedding(ys),
encoder_outputs,
(mask_src, mask_trg),
attention_parameters)
logit = self.generator(out,
attn_dist,
enc_batch_extend_vocab,
extra_zeros,
attn_dist_db=None)
filtered_logit = top_k_top_p_filtering(logit[:, -1],
top_k=3,
top_p=0,
filter_value=-float('Inf'))
# Sample from the filtered distribution
next_word = torch.multinomial(F.softmax(filtered_logit, dim=-1),
1).squeeze()
decoded_words.append([
'<EOS>' if ni.item() == config.EOS_idx else
self.vocab.index2word[ni.item()] for ni in next_word.view(-1)
])
next_word = next_word.data[0]
if config.USE_CUDA:
ys = torch.cat(
[ys, torch.ones(1, 1).long().fill_(next_word).cuda()],
dim=1)
ys = ys.cuda()
else:
ys = torch.cat(
[ys, torch.ones(1, 1).long().fill_(next_word)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>': break
else: st += e + ' '
sent.append(st)
return sent
class PGNet(nn.Module):
'''
refer: https://github.com/atulkum/pointer_summarizer
'''
def __init__(self,
vocab,
model_file_path=None,
is_eval=False,
load_optim=False):
super(PGNet, self).__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, config.pretrain_emb)
self.encoder = Encoder()
self.decoder = Decoder()
self.reduce_state = ReduceState()
self.generator = Generator(config.rnn_hidden_dim, self.vocab_size)
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
if config.label_smoothing:
self.criterion = LabelSmoothing(size=self.vocab_size,
padding_idx=config.PAD_idx,
smoothing=0.1)
self.criterion_ppl = nn.NLLLoss(ignore_index=config.PAD_idx)
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if config.noam:
self.optimizer = NoamOpt(
config.rnn_hidden_dim, 1, 8000,
torch.optim.Adam(self.parameters(),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
if model_file_path is not None:
print("loading weights")
state = torch.load(model_file_path,
map_location=lambda storage, location: storage)
self.encoder.load_state_dict(state['encoder_state_dict'])
self.decoder.load_state_dict(state['decoder_state_dict'])
self.generator.load_state_dict(state['generator_dict'])
self.embedding.load_state_dict(state['embedding_dict'])
if load_optim:
self.optimizer.load_state_dict(state['optimizer'])
self.eval()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
def save_model(self, running_avg_ppl, iter, f1_g, f1_b, ent_g, ent_b):
state = {
'iter': iter,
'encoder_state_dict': self.encoder.state_dict(),
'decoder_state_dict': self.decoder.state_dict(),
'generator_dict': self.generator.state_dict(),
'embedding_dict': self.embedding.state_dict(),
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl
}
model_save_path = os.path.join(
self.model_dir,
'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(
iter, running_avg_ppl, f1_g, f1_b, ent_g, ent_b))
self.best_path = model_save_path
torch.save(state, model_save_path)
def train_one_batch(self, batch, iter, train=True):
enc_batch = batch["review_batch"]
enc_lens = batch["review_length"]
enc_batch_extend_vocab = batch["review_ext_batch"]
oovs = batch["oovs"]
max_oov_length = len(
sorted(oovs, key=lambda i: len(i), reverse=True)[0])
dec_batch = batch["tags_batch"]
dec_ext_batch = batch["tags_ext_batch"]
max_tgt_len = dec_batch.size(0)
if config.noam:
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
## Embedding - context
mask_src = enc_batch
mask_src = ~(mask_src.data.eq(config.PAD_idx))
# emb_mask = self.embedding(batch["mask_context"])
# src_emb = self.embedding(enc_batch)+emb_mask
src_emb = self.embedding(enc_batch)
encoder_outputs, encoder_feature, encoder_hidden = self.encoder(
src_emb, enc_lens)
# reduce bidirectional hidden to one hidden (h and c)
s_t_1 = self.reduce_state(encoder_hidden) # 1 x b x hidden_dim
c_t_1 = Variable(
torch.zeros((enc_batch.size(0),
2 * config.rnn_hidden_dim))).to(config.device)
coverage = Variable(torch.zeros(enc_batch.size())).to(config.device)
extra_zeros = Variable(torch.zeros(
(enc_batch.size(0), max_oov_length))).to(config.device)
sos_token = torch.LongTensor([config.SOS_idx] *
enc_batch.size(0)).unsqueeze(1).to(
config.device) # (bsz, 1)
dec_batch_shift = torch.cat((sos_token, dec_batch[:, :-1]),
1) # (bsz, tgt_len)
dec_batch_embd = self.embedding(dec_batch_shift)
step_losses = []
step_loss_ppls = 0
for di in range(max_tgt_len):
y_t_1 = dec_batch_embd[:, di, :]
logit, s_t_1, c_t_1, attn_dist, next_coverage, p_gen = self.decoder(
y_t_1, s_t_1, encoder_outputs, encoder_feature, mask_src,
c_t_1, coverage, di)
logit = self.generator(
logit, attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros, 1, p_gen)
if config.pointer_gen:
step_loss = self.criterion(
logit.contiguous().view(-1, logit.size(-1)),
dec_ext_batch[:, di].contiguous().view(-1))
else:
step_loss = self.criterion(
logit.contiguous().view(-1, logit.size(-1)),
dec_batch[:, di].contiguous().view(-1))
if config.label_smoothing:
step_loss_ppl = self.criterion_ppl(
logit.contiguous().view(-1, logit.size(-1)),
dec_batch[:, di].contiguous().view(-1))
step_loss_ppls += step_loss_ppl
if config.is_coverage:
# coverage loss
step_coverage_loss = torch.sum(torch.min(attn_dist, coverage),
1)
# loss sum
step_loss = step_loss + config.cov_loss_wt * step_coverage_loss
# update coverage
coverage = next_coverage
step_losses.append(step_loss)
if config.is_coverage:
sum_losses = torch.sum(torch.stack(step_losses, 1), 1)
batch_avg_loss = sum_losses / batch['tags_length'].float()
loss = torch.mean(batch_avg_loss)
else:
loss = sum(step_losses) / max_tgt_len
if config.label_smoothing:
loss_ppl = (step_loss_ppls / max_tgt_len).item()
if train:
loss.backward()
self.optimizer.step()
if config.label_smoothing:
return loss_ppl, math.exp(min(loss_ppl, 100)), 0, 0
else:
return loss.item(), math.exp(min(loss.item(), 100)), 0, 0
def decoder_greedy(self, batch, max_dec_step=30):
enc_batch = batch["review_batch"]
enc_lens = batch["review_length"]
enc_batch_extend_vocab = batch["review_ext_batch"]
oovs = batch["oovs"]
max_oov_length = len(
sorted(oovs, key=lambda i: len(i), reverse=True)[0])
dec_batch = batch["tags_batch"]
dec_ext_batch = batch["tags_ext_batch"]
max_tgt_len = dec_batch.size(0)
## Embedding - context
mask_src = enc_batch
mask_src = ~(mask_src.data.eq(config.PAD_idx))
# emb_mask = self.embedding(batch["mask_context"])
# src_emb = self.embedding(enc_batch)+emb_mask
src_emb = self.embedding(enc_batch)
encoder_outputs, encoder_feature, encoder_hidden = self.encoder(
src_emb, enc_lens)
# reduce bidirectional hidden to one hidden (h and c)
s_t_1 = self.reduce_state(encoder_hidden) # 1 x b x hidden_dim
c_t_1 = Variable(
torch.zeros((enc_batch.size(0),
2 * config.rnn_hidden_dim))).to(config.device)
coverage = Variable(torch.zeros(enc_batch.size())).to(config.device)
extra_zeros = Variable(torch.zeros(
(enc_batch.size(0), max_oov_length))).to(config.device)
# ys = torch.ones(1, 1).fill_(config.SOS_idx).long()
ys = torch.zeros(enc_batch.size(0)).fill_(config.SOS_idx).long().to(
config.device) # when testing, we set bsz into 1
decoded_words = []
for i in range(max_dec_step + 1):
logit, s_t_1, c_t_1, attn_dist, next_coverage, p_gen = self.decoder(
self.embedding(ys), s_t_1, encoder_outputs, encoder_feature,
mask_src, c_t_1, coverage, i)
prob = self.generator(
logit, attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros, 1, p_gen)
_, next_word = torch.max(prob, dim=1) # bsz=1
cur_words = []
for i_batch, ni in enumerate(next_word.view(-1)):
if ni.item() == config.EOS_idx:
cur_words.append('<EOS>')
elif ni.item() in self.vocab.index2word:
cur_words.append(self.vocab.index2word[ni.item()])
else:
cur_words.append(oovs[i_batch][ni.item() -
self.vocab.n_words])
decoded_words.append(cur_words)
next_word = next_word.data[0]
if next_word.item() not in self.vocab.index2word:
next_word = torch.tensor(config.UNK_idx)
ys = torch.zeros(enc_batch.size(0)).long().fill_(next_word).to(
config.device)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>':
break
else:
st += e + ' '
sent.append(st)
return sent
class AOT(nn.Module):
def __init__(self,
vocab,
model_file_path=None,
is_eval=False,
load_optim=False):
super(AOT, self).__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, config.pretrain_emb)
self.encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
self.sse = SSE(vocab, config.emb_dim, config.dropout,
config.rnn_hidden_dim)
self.rcr = RCR()
## multiple decoders
self.decoder = Decoder(config.emb_dim,
hidden_size=config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter)
self.generator = Generator(config.hidden_dim, self.vocab_size)
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
if config.label_smoothing:
self.criterion = LabelSmoothing(size=self.vocab_size,
padding_idx=config.PAD_idx,
smoothing=0.1)
self.criterion_ppl = nn.NLLLoss(ignore_index=config.PAD_idx)
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if config.noam:
self.optimizer = NoamOpt(
config.hidden_dim, 1, 8000,
torch.optim.Adam(self.parameters(),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
if model_file_path is not None:
print("loading weights")
state = torch.load(model_file_path,
map_location=lambda storage, location: storage)
self.encoder.load_state_dict(state['encoder_state_dict'])
self.decoder.load_state_dict(state['decoder_state_dict'])
self.generator.load_state_dict(state['generator_dict'])
self.embedding.load_state_dict(state['embedding_dict'])
if load_optim:
self.optimizer.load_state_dict(state['optimizer'])
self.eval()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
def save_model(self, running_avg_ppl, iter, f1_g, f1_b, ent_g, ent_b):
state = {
'iter': iter,
'encoder_state_dict': self.encoder.state_dict(),
'decoder_state_dict': self.decoder.state_dict(),
'generator_dict': self.generator.state_dict(),
'embedding_dict': self.embedding.state_dict(),
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl
}
model_save_path = os.path.join(
self.model_dir,
'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(
iter, running_avg_ppl, f1_g, f1_b, ent_g, ent_b))
self.best_path = model_save_path
torch.save(state, model_save_path)
def train_one_batch_slow(self, batch, iter, train=True):
enc_batch = batch["review_batch"]
enc_batch_extend_vocab = batch["review_ext_batch"]
src_batch = batch[
'reviews_batch'] # reviews sequence (bsz, r_num, r_len)
src_mask = batch[
'reviews_mask'] # indicate which review is fake(for padding). (bsz, r_num)
src_length = batch['reviews_length'] # (bsz, r_num)
enc_length_batch = batch[
'reviews_length_list'] # 2-dim list, 0: len=bsz, 1: lens of reviews and pads
src_labels = batch['reviews_label'] # (bsz, r_num)
oovs = batch["oovs"]
max_oov_length = len(
sorted(oovs, key=lambda i: len(i), reverse=True)[0])
extra_zeros = Variable(torch.zeros(
(enc_batch.size(0), max_oov_length))).to(config.device)
dec_batch = batch["tags_batch"]
dec_ext_batch = batch["tags_ext_batch"]
dec_rank_batch = batch[
'tags_idx_batch'] # tag indexes sequence (bsz, tgt_len)
if config.noam:
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
# 1. Sentence-level Salience Estimation (SSE)
cla_loss, sa_scores, sa_acc = self.sse.salience_estimate(
src_batch, src_mask, src_length,
src_labels) # sa_scores: (bsz, r_num)
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(
1) # (bsz, src_len)->(bsz, 1, src_len)
# emb_mask = self.embedding(batch["mask_context"])
# src_emb = self.embedding(enc_batch)+emb_mask
src_emb = self.embedding(enc_batch)
encoder_outputs = self.encoder(src_emb,
mask_src) # (bsz, src_len, emb_dim)
src_enc_rank = torch.FloatTensor([]).to(
config.device) # (bsz, src_len, emb_dim)
src_ext_rank = torch.LongTensor([]).to(config.device) # (bsz, src_len)
aln_rank = torch.LongTensor([]).to(
config.device) # (bsz, tgt_len, src_len)
aln_mask_rank = torch.FloatTensor([]).to(
config.device) # (bsz, tgt_len, src_len)
bsz, max_src_len = enc_batch.size()
for idx in range(bsz): # Custering (by k-means) and Ranking
item_length = enc_length_batch[idx]
reviews = torch.split(encoder_outputs[idx], item_length, dim=0)
reviews_ext = torch.split(enc_batch_extend_vocab[idx],
item_length,
dim=0)
r_vectors = [] # store the vector repr of each review
rs_vectors = [] # store the token vectors repr of each review
r_exts = []
r_pad_vec, r_ext_pad = None, None
for r_idx in range(len(item_length)):
if r_idx == len(item_length) - 1:
r_pad_vec = reviews[r_idx]
r_ext_pad = reviews_ext[r_idx]
break
r = self.rcr.hierarchical_pooling(reviews[r_idx].unsqueeze(
0)).squeeze(0).detach().cpu().numpy() * sa_scores[idx,
r_idx]
r_vectors.append(r)
rs_vectors.append(reviews[r_idx])
r_exts.append(reviews_ext[r_idx])
rs_repr, ext_repr, srctgt_aln_mask, srctgt_aln = \
self.rcr.perform(r_vectors, rs_vectors, r_exts, r_pad_vec, r_ext_pad, dec_rank_batch[idx], max_src_len)
# rs_repr: (max_rs_length, embed_dim); ext_repr: (max_rs_length); srctgt_aln_mask/srctgt_aln: (tgt_len, max_rs_length)
src_enc_rank = torch.cat((src_enc_rank, rs_repr.unsqueeze(0)),
dim=0) # (1->bsz, max_src_len, embed_dim)
src_ext_rank = torch.cat((src_ext_rank, ext_repr.unsqueeze(0)),
dim=0) # （1->bsz, max_src_len）
aln_rank = torch.cat((aln_rank, srctgt_aln.unsqueeze(0)),
dim=0) # （1->bsz, max_tgt_len, max_src_len）
aln_mask_rank = torch.cat(
(aln_mask_rank, srctgt_aln_mask.unsqueeze(0)), dim=0)
del encoder_outputs, reviews, reviews_ext, r_vectors, rs_vectors, r_exts, r_pad_vec, r_ext_pad, rs_repr, ext_repr, srctgt_aln_mask, srctgt_aln
torch.cuda.empty_cache()
torch.backends.cuda.cufft_plan_cache.clear()
ys = torch.LongTensor([config.SOS_idx] *
enc_batch.size(0)).unsqueeze(1).to(
config.device) # (bsz, 1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
ys_rank = torch.LongTensor([1] * enc_batch.size(0)).unsqueeze(1).to(
config.device)
max_tgt_len = dec_batch.size(1)
loss, loss_ppl = 0, 0
for t in range(max_tgt_len):
aln_rank_cur = aln_rank[:, t, :].unsqueeze(1) # (bsz, 1, src_len)
aln_mask_cur = aln_mask_rank[:, :(t + 1), :] # (bsz, src_len)
pre_logit, attn_dist, aln_loss_cur = self.decoder(
inputs=self.embedding(ys),
inputs_rank=ys_rank,
encoder_output=src_enc_rank,
aln_rank=aln_rank_cur,
aln_mask_rank=aln_mask_cur,
mask=(mask_src, mask_trg),
speed='slow')
# todo
if iter >= 13000:
loss += (0.1 * aln_loss_cur)
else:
loss += aln_loss_cur
logit = self.generator(
pre_logit, attn_dist.unsqueeze(1),
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros)
if config.pointer_gen:
loss += self.criterion(
logit[:, -1, :].contiguous().view(-1, logit.size(-1)),
dec_ext_batch[:, t].contiguous().view(-1))
else:
loss += self.criterion(
logit[:, -1, :].contiguous().view(-1, logit.size(-1)),
dec_batch[:, t].contiguous().view(-1))
if config.label_smoothing:
loss_ppl += self.criterion_ppl(
logit[:, -1, :].contiguous().view(-1, logit.size(-1)),
dec_ext_batch[:, t].contiguous().view(-1) if
config.pointer_gen else dec_batch[:,
t].contiguous().view(-1))
ys = torch.cat((ys, dec_batch[:, t].unsqueeze(1)), dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
ys_rank = torch.cat((ys_rank, dec_rank_batch[:, t].unsqueeze(1)),
dim=1)
loss = loss + cla_loss
if train:
loss /= max_tgt_len
loss.backward()
self.optimizer.step()
if config.label_smoothing:
loss_ppl /= max_tgt_len
if torch.isnan(loss_ppl).sum().item() != 0 or torch.isinf(
loss_ppl).sum().item() != 0:
print("check")
pdb.set_trace()
return loss_ppl.item(), math.exp(min(loss_ppl.item(),
100)), cla_loss.item(), sa_acc
else:
return loss.item(), math.exp(min(loss.item(),
100)), cla_loss.item(), sa_acc
def train_one_batch(self, batch, iter, train=True):
enc_batch = batch["review_batch"]
enc_batch_extend_vocab = batch["review_ext_batch"]
src_batch = batch[
'reviews_batch'] # reviews sequence (bsz, r_num, r_len)
src_mask = batch[
'reviews_mask'] # indicate which review is fake(for padding). (bsz, r_num)
src_length = batch['reviews_length'] # (bsz, r_num)
enc_length_batch = batch[
'reviews_length_list'] # 2-dim list, 0: len=bsz, 1: lens of reviews and pads
src_labels = batch['reviews_label'] # (bsz, r_num)
oovs = batch["oovs"]
max_oov_length = len(
sorted(oovs, key=lambda i: len(i), reverse=True)[0])
extra_zeros = Variable(torch.zeros(
(enc_batch.size(0), max_oov_length))).to(config.device)
dec_batch = batch["tags_batch"]
dec_ext_batch = batch["tags_ext_batch"]
dec_rank_batch = batch[
'tags_idx_batch'] # tag indexes sequence (bsz, tgt_len)
if config.noam:
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
# 1. Sentence-level Salience Estimation (SSE)
cla_loss, sa_scores, sa_acc = self.sse.salience_estimate(
src_batch, src_mask, src_length,
src_labels) # sa_scores: (bsz, r_num)
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(
1) # (bsz, src_len)->(bsz, 1, src_len)
# emb_mask = self.embedding(batch["mask_context"])
# src_emb = self.embedding(enc_batch)+emb_mask
src_emb = self.embedding(enc_batch)
encoder_outputs = self.encoder(src_emb,
mask_src) # (bsz, src_len, emb_dim)
src_enc_rank = torch.FloatTensor([]).to(
config.device) # (bsz, src_len, emb_dim)
src_ext_rank = torch.LongTensor([]).to(config.device) # (bsz, src_len)
aln_rank = torch.LongTensor([]).to(
config.device) # (bsz, tgt_len, src_len)
aln_mask_rank = torch.FloatTensor([]).to(
config.device) # (bsz, tgt_len, src_len)
bsz, max_src_len = enc_batch.size()
for idx in range(bsz): # Custering (by k-means) and Ranking
item_length = enc_length_batch[idx]
reviews = torch.split(encoder_outputs[idx], item_length, dim=0)
reviews_ext = torch.split(enc_batch_extend_vocab[idx],
item_length,
dim=0)
r_vectors = [] # store the vector repr of each review
rs_vectors = [] # store the token vectors repr of each review
r_exts = []
r_pad_vec, r_ext_pad = None, None
for r_idx in range(len(item_length)):
if r_idx == len(item_length) - 1:
r_pad_vec = reviews[r_idx]
r_ext_pad = reviews_ext[r_idx]
break
r = self.rcr.hierarchical_pooling(reviews[r_idx].unsqueeze(
0)).squeeze(0).detach().cpu().numpy() * sa_scores[idx,
r_idx]
r_vectors.append(r)
rs_vectors.append(reviews[r_idx])
r_exts.append(reviews_ext[r_idx])
rs_repr, ext_repr, srctgt_aln_mask, srctgt_aln = \
self.rcr.perform(r_vectors, rs_vectors, r_exts, r_pad_vec, r_ext_pad, dec_rank_batch[idx], max_src_len)
# rs_repr: (max_rs_length, embed_dim); ext_repr: (max_rs_length); srctgt_aln_mask/srctgt_aln: (tgt_len, max_rs_length)
src_enc_rank = torch.cat((src_enc_rank, rs_repr.unsqueeze(0)),
dim=0) # (1->bsz, max_src_len, embed_dim)
src_ext_rank = torch.cat((src_ext_rank, ext_repr.unsqueeze(0)),
dim=0) # （1->bsz, max_src_len）
aln_rank = torch.cat((aln_rank, srctgt_aln.unsqueeze(0)),
dim=0) # （1->bsz, max_tgt_len, max_src_len）
aln_mask_rank = torch.cat(
(aln_mask_rank, srctgt_aln_mask.unsqueeze(0)), dim=0)
del encoder_outputs, reviews, reviews_ext, r_vectors, rs_vectors, r_exts, r_pad_vec, r_ext_pad, rs_repr, ext_repr, srctgt_aln_mask, srctgt_aln
torch.cuda.empty_cache()
torch.backends.cuda.cufft_plan_cache.clear()
sos_token = torch.LongTensor([config.SOS_idx] *
enc_batch.size(0)).unsqueeze(1).to(
config.device) # (bsz, 1)
dec_batch_shift = torch.cat((sos_token, dec_batch[:, :-1]),
1) # (bsz, tgt_len)
mask_trg = dec_batch_shift.data.eq(config.PAD_idx).unsqueeze(1)
sos_rank = torch.LongTensor([1] * enc_batch.size(0)).unsqueeze(1).to(
config.device)
dec_rank_batch = torch.cat((sos_rank, dec_rank_batch[:, :-1]), 1)
aln_rank = aln_rank[:, :-1, :]
aln_mask_rank = aln_mask_rank[:, :-1, :]
pre_logit, attn_dist, aln_loss = self.decoder(
inputs=self.embedding(dec_batch_shift),
inputs_rank=dec_rank_batch,
encoder_output=src_enc_rank,
aln_rank=aln_rank,
aln_mask_rank=aln_mask_rank,
mask=(mask_src, mask_trg))
logit = self.generator(
pre_logit, attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros)
if config.pointer_gen:
loss = self.criterion(logit.contiguous().view(-1, logit.size(-1)),
dec_ext_batch.contiguous().view(-1))
else:
loss = self.criterion(logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1))
if config.label_smoothing:
loss_ppl = self.criterion_ppl(
logit.contiguous().view(-1, logit.size(-1)),
dec_ext_batch.contiguous().view(-1)
if config.pointer_gen else dec_batch.contiguous().view(-1))
if train:
if iter >= 13000:
loss = loss + (0.1 * aln_loss) + cla_loss
else:
loss = loss + aln_loss + cla_loss
loss = loss + aln_loss + cla_loss
loss.backward()
self.optimizer.step()
if config.label_smoothing:
if torch.isnan(loss_ppl).sum().item() != 0 or torch.isinf(
loss_ppl).sum().item() != 0:
print("check")
pdb.set_trace()
return loss_ppl.item(), math.exp(min(loss_ppl.item(),
100)), cla_loss.item(), sa_acc
else:
return loss.item(), math.exp(min(loss.item(),
100)), cla_loss.item(), sa_acc
def compute_act_loss(self, module):
R_t = module.remainders
N_t = module.n_updates
p_t = R_t + N_t
avg_p_t = torch.sum(torch.sum(p_t, dim=1) / p_t.size(1)) / p_t.size(0)
loss = config.act_loss_weight * avg_p_t.item()
return loss
def decoder_greedy(self, batch, max_dec_step=30):
enc_batch = batch["review_batch"]
enc_batch_extend_vocab = batch["review_ext_batch"]
src_batch = batch[
'reviews_batch'] # reviews sequence (bsz, r_num, r_len)
src_mask = batch[
'reviews_mask'] # indicate which review is fake(for padding). (bsz, r_num)
src_length = batch['reviews_length'] # (bsz, r_num)
enc_length_batch = batch[
'reviews_length_list'] # 2-dim list, 0: len=bsz, 1: lens of reviews and pads
src_labels = batch['reviews_label'] # (bsz, r_num)
oovs = batch["oovs"]
max_oov_length = len(
sorted(oovs, key=lambda i: len(i), reverse=True)[0])
extra_zeros = Variable(torch.zeros(
(enc_batch.size(0), max_oov_length))).to(config.device)
# 1. Sentence-level Salience Estimation (SSE)
cla_loss, sa_scores, sa_acc = self.sse.salience_estimate(
src_batch, src_mask, src_length,
src_labels) # sa_scores: (bsz, r_num)
## Encode - context
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(
1) # (bsz, src_len)->(bsz, 1, src_len)
# emb_mask = self.embedding(batch["mask_context"])
# src_emb = self.embedding(enc_batch) + emb_mask # todo eos or sentence embedding??
src_emb = self.embedding(enc_batch)
encoder_outputs = self.encoder(src_emb,
mask_src) # (bsz, src_len, emb_dim)
src_enc_rank = torch.FloatTensor([]).to(
config.device) # (bsz, src_len, emb_dim)
src_ext_rank = torch.LongTensor([]).to(config.device) # (bsz, src_len)
aln_rank = torch.LongTensor([]).to(
config.device) # (bsz, tgt_len, src_len)
aln_mask_rank = torch.FloatTensor([]).to(
config.device) # (bsz, tgt_len, src_len)
bsz, max_src_len = enc_batch.size()
for idx in range(bsz): # Custering (by k-means) and Ranking
item_length = enc_length_batch[idx]
reviews = torch.split(encoder_outputs[idx], item_length, dim=0)
reviews_ext = torch.split(enc_batch_extend_vocab[idx],
item_length,
dim=0)
r_vectors = [] # store the vector repr of each review
rs_vectors = [] # store the token vectors repr of each review
r_exts = []
r_pad_vec, r_ext_pad = None, None
for r_idx in range(len(item_length)):
if r_idx == len(item_length) - 1:
r_pad_vec = reviews[r_idx]
r_ext_pad = reviews_ext[r_idx]
break
r = self.rcr.hierarchical_pooling(reviews[r_idx].unsqueeze(
0)).squeeze(0).detach().cpu().numpy() * sa_scores[idx,
r_idx]
r_vectors.append(r)
rs_vectors.append(reviews[r_idx])
r_exts.append(reviews_ext[r_idx])
rs_repr, ext_repr, srctgt_aln_mask, srctgt_aln = self.rcr.perform(
r_vecs=r_vectors,
rs_vecs=rs_vectors,
r_exts=r_exts,
r_pad_vec=r_pad_vec,
r_ext_pad=r_ext_pad,
max_rs_length=max_src_len,
train=False)
# rs_repr: (max_rs_length, embed_dim); ext_repr: (max_rs_length); srctgt_aln_mask/srctgt_aln: (tgt_len, max_rs_length)
src_enc_rank = torch.cat((src_enc_rank, rs_repr.unsqueeze(0)),
dim=0) # (1->bsz, max_src_len, embed_dim)
src_ext_rank = torch.cat((src_ext_rank, ext_repr.unsqueeze(0)),
dim=0) # （1->bsz, max_src_len）
aln_rank = torch.cat((aln_rank, srctgt_aln.unsqueeze(0)),
dim=0) # （1->bsz, max_tgt_len, max_src_len）
aln_mask_rank = torch.cat(
(aln_mask_rank, srctgt_aln_mask.unsqueeze(0)), dim=0)
del encoder_outputs, reviews, reviews_ext, r_vectors, rs_vectors, r_exts, r_pad_vec, r_ext_pad, rs_repr, ext_repr, srctgt_aln_mask, srctgt_aln
torch.cuda.empty_cache()
torch.backends.cuda.cufft_plan_cache.clear()
# ys = torch.ones(1, 1).fill_(config.SOS_idx).long()
ys = torch.zeros(enc_batch.size(0), 1).fill_(config.SOS_idx).long().to(
config.device) # when testing, we set bsz into 1
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
ys_rank = torch.ones(enc_batch.size(0), 1).long().to(config.device)
last_rank = torch.ones(enc_batch.size(0), 1).long().to(config.device)
pred_attn_dist = torch.FloatTensor([]).to(config.device)
decoded_words = []
for i in range(max_dec_step + 1):
aln_rank_cur = aln_rank[:, last_rank.item(), :].unsqueeze(
1) # (bsz, src_len)
if config.project:
out, attn_dist, _ = self.decoder(
inputs=self.embedding_proj_in(self.embedding(ys)),
inputs_rank=ys_rank,
encoder_output=self.embedding_proj_in(src_enc_rank),
aln_rank=aln_rank_cur,
aln_mask_rank=aln_mask_rank, # nouse
mask=(mask_src, mask_trg),
speed='slow')
else:
out, attn_dist, _ = self.decoder(inputs=self.embedding(ys),
inputs_rank=ys_rank,
encoder_output=src_enc_rank,
aln_rank=aln_rank_cur,
aln_mask_rank=aln_mask_rank,
mask=(mask_src, mask_trg),
speed='slow')
prob = self.generator(out, attn_dist, enc_batch_extend_vocab,
extra_zeros)
_, next_word = torch.max(prob[:, -1], dim=1) # bsz=1, if test
cur_words = []
for i_batch, ni in enumerate(next_word.view(-1)):
if ni.item() == config.EOS_idx:
cur_words.append('<EOS>')
last_rank[i_batch] = 0
elif ni.item() in self.vocab.index2word:
cur_words.append(self.vocab.index2word[ni.item()])
if ni.item() == config.SOS_idx:
last_rank[i_batch] += 1
else:
cur_words.append(oovs[i_batch][
ni.item() -
self.vocab.n_words]) # output non-dict word
next_word[i_batch] = config.UNK_idx # input unk word
decoded_words.append(cur_words)
# next_word = next_word.data[0]
# if next_word.item() not in self.vocab.index2word:
# next_word = torch.tensor(config.UNK_idx)
# if config.USE_CUDA:
ys = torch.cat([ys, next_word.unsqueeze(1)],
dim=1).to(config.device)
ys_rank = torch.cat([ys_rank, last_rank], dim=1).to(config.device)
# else:
# ys = torch.cat([ys, next_word],dim=1)
# ys_rank = torch.cat([ys_rank, last_rank],dim=1)
# if config.USE_CUDA:
# ys = torch.cat([ys, torch.zeros(enc_batch.size(0), 1).long().fill_(next_word).cuda()], dim=1)
# ys = ys.cuda()
# else:
# ys = torch.cat([ys, torch.zeros(enc_batch.size(0), 1).long().fill_(next_word)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
if config.attn_analysis:
pred_attn_dist = torch.cat(
(pred_attn_dist, attn_dist.unsqueeze(1)), dim=1)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>':
break
else:
st += e + ' '
sent.append(st)
if config.attn_analysis:
bsz, tgt_len, src_len = aln_mask_rank.size()
pred_attn = pred_attn_dist[:, 1:, :].view(bsz * tgt_len, src_len)
tgt_attn = aln_mask_rank.view(bsz * tgt_len, src_len)
good_attn_sum = torch.masked_select(
pred_attn,
tgt_attn.bool()).sum() # pred_attn: bsz * tgt_len, src_len
bad_attn_sum = torch.masked_select(pred_attn,
~tgt_attn.bool()).sum()
bad_num = ~tgt_attn.bool()
ratio = bad_num.sum() / tgt_attn.bool().sum()
bad_attn_sum /= ratio
good_attn = good_attn_sum[
0] # last step (because this's already been the whole sentence length.).
bad_attn = bad_attn_sum[1]
good_attn /= (tgt_len * bsz)
bad_attn /= (tgt_len * bsz)
return sent, [good_attn, bad_attn]
else:
return sent
class CvaeTrans(nn.Module):
def __init__(self, vocab, emo_number, model_file_path=None, is_eval=False, load_optim=False):
super(CvaeTrans, self).__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, pretrain=False)
self.word_encoder = WordEncoder(config.emb_dim, config.hidden_dim, config.bidirectional)
self.encoder = Encoder(config.hidden_dim, num_layers=config.hop, num_heads=config.heads,
total_key_depth=config.depth, total_value_depth=config.depth,
filter_size=config.filter, universal=config.universal)
self.r_encoder = Encoder(config.hidden_dim, num_layers=config.hop, num_heads=config.heads,
total_key_depth=config.depth, total_value_depth=config.depth,
filter_size=config.filter, universal=config.universal)
self.decoder = VarDecoder(config.emb_dim, hidden_size=config.hidden_dim, num_layers=config.hop,
num_heads=config.heads, total_key_depth=config.depth, total_value_depth=config.depth,
filter_size=config.filter, vocab_size=self.vocab_size)
self.generator = Generator(config.hidden_dim, self.vocab_size)
self.linear = nn.Linear(2 * config.hidden_dim, config.hidden_dim)
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
if model_file_path:
print("loading weights")
state = torch.load(model_file_path, map_location= lambda storage, location: storage)
self.encoder.load_state_dict(state['encoder_state_dict'])
#self.r_encoder.load_state_dict(state['r_encoder_state_dict'])
self.decoder.load_state_dict(state['decoder_state_dict'])
self.generator.load_state_dict(state['generator_dict'])
self.embedding.load_state_dict(state['embedding_dict'])
if (config.USE_CUDA):
self.cuda()
if is_eval:
self.eval()
else:
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if(config.noam):
self.optimizer = NoamOpt(config.hidden_dim, 1, 8000, torch.optim.Adam(self.parameters(), lr=0, betas=(0.9, 0.98), eps=1e-9))
if (load_optim):
self.optimizer.load_state_dict(state['optimizer'])
if config.USE_CUDA:
for state in self.optimizer.state.values():
for k, v in state.items():
if isinstance(v, torch.Tensor):
state[k] = v.cuda()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
def save_model(self, running_avg_ppl, iter, f1_g,f1_b,ent_g,ent_b):
state = {
'iter': iter,
'encoder_state_dict': self.encoder.state_dict(),
#'r_encoder_state_dict': self.r_encoder.state_dict(),
'decoder_state_dict': self.decoder.state_dict(),
'generator_dict': self.generator.state_dict(),
'embedding_dict': self.embedding.state_dict(),
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl
}
model_save_path = os.path.join(self.model_dir, 'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(iter,running_avg_ppl,f1_g,f1_b,ent_g,ent_b) )
self.best_path = model_save_path
torch.save(state, model_save_path)
def train_one_batch(self, batch, iter, train=True):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(batch)
dec_batch, _, _, _, _ = get_output_from_batch(batch)
if(config.noam):
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
## Response encode
mask_res = batch["posterior_batch"].data.eq(config.PAD_idx).unsqueeze(1)
post_emb = self.embedding(batch["posterior_batch"])
r_encoder_outputs = self.r_encoder(post_emb, mask_res)
## Encode
num_sentences, enc_seq_len = enc_batch.size()
batch_size = enc_lens.size(0)
max_len = enc_lens.data.max().item()
input_lengths = torch.sum(~enc_batch.data.eq(config.PAD_idx), dim=1)
# word level encoder
enc_emb = self.embedding(enc_batch)
word_encoder_outpus, word_encoder_hidden = self.word_encoder(enc_emb, input_lengths)
word_encoder_hidden = word_encoder_hidden.transpose(1, 0).reshape(num_sentences, -1)
# pad and pack word_encoder_hidden
start = torch.cumsum(torch.cat((enc_lens.data.new(1).zero_(), enc_lens[:-1])), 0)
word_encoder_hidden = torch.stack([pad(word_encoder_hidden.narrow(0, s, l), max_len)
for s, l in zip(start.data.tolist(), enc_lens.data.tolist())], 0)
# mask_src = ~(enc_padding_mask.bool()).unsqueeze(1)
mask_src = (1 - enc_padding_mask.byte()).unsqueeze(1)
# context level encoder
if word_encoder_hidden.size(-1) != config.hidden_dim:
word_encoder_hidden = self.linear(word_encoder_hidden)
encoder_outputs = self.encoder(word_encoder_hidden, mask_src)
# Decode
sos_token = torch.LongTensor([config.SOS_idx] * batch_size).unsqueeze(1)
if config.USE_CUDA: sos_token = sos_token.cuda()
dec_batch_shift = torch.cat((sos_token, dec_batch[:, :-1]), 1) #(batch, len, embedding)
mask_trg = dec_batch_shift.data.eq(config.PAD_idx).unsqueeze(1)
dec_emb = self.embedding(dec_batch_shift)
pre_logit, attn_dist, mean, log_var, probs = self.decoder(dec_emb, encoder_outputs, r_encoder_outputs,
(mask_src, mask_res, mask_trg))
## compute output dist
logit = self.generator(pre_logit, attn_dist, enc_batch_extend_vocab if config.pointer_gen else None, extra_zeros, attn_dist_db=None)
## loss: NNL if ptr else Cross entropy
sbow = dec_batch #[batch, seq_len]
seq_len = sbow.size(1)
loss_rec = self.criterion(logit.contiguous().view(-1, logit.size(-1)), dec_batch.contiguous().view(-1))
if config.model=="cvaetrs":
loss_aux = 0
for prob in probs:
sbow_mask = _get_attn_subsequent_mask(seq_len).transpose(1,2)
sbow.unsqueeze(2).repeat(1,1,seq_len).masked_fill_(sbow_mask,config.PAD_idx)#[batch, seq_len, seq_len]
loss_aux+= self.criterion(prob.contiguous().view(-1, prob.size(-1)), sbow.contiguous().view(-1))
kld_loss = gaussian_kld(mean["posterior"], log_var["posterior"],mean["prior"], log_var["prior"])
kld_loss = torch.mean(kld_loss)
kl_weight = min(math.tanh(6 * iter/config.full_kl_step - 3) + 1, 1)
#kl_weight = min(iter/config.full_kl_step, 1) if config.full_kl_step >0 else 1.0
loss = loss_rec + config.kl_ceiling * kl_weight*kld_loss + config.aux_ceiling*loss_aux
elbo = loss_rec + kld_loss
else:
loss = loss_rec
elbo = loss_rec
kld_loss = torch.Tensor([0])
loss_aux = torch.Tensor([0])
if(train):
loss.backward()
# clip gradient
nn.utils.clip_grad_norm_(self.parameters(), config.max_grad_norm)
self.optimizer.step()
return loss_rec.item(), math.exp(min(loss_rec.item(), 100)), kld_loss.item(), loss_aux.item(), elbo.item()
def train_n_batch(self, batchs, iter, train=True):
if(config.noam):
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
for batch in batchs:
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(batch)
dec_batch, _, _, _, _ = get_output_from_batch(batch)
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
meta = self.embedding(batch["program_label"])
if config.dataset=="empathetic":
meta = meta-meta
# Decode
sos_token = torch.LongTensor([config.SOS_idx] * enc_batch.size(0)).unsqueeze(1)
if config.USE_CUDA: sos_token = sos_token.cuda()
dec_batch_shift = torch.cat((sos_token,dec_batch[:, :-1]),1)
mask_trg = dec_batch_shift.data.eq(config.PAD_idx).unsqueeze(1)
pre_logit, attn_dist, mean, log_var, probs= self.decoder(self.embedding(dec_batch_shift)+meta.unsqueeze(1),encoder_outputs, True, (mask_src,mask_trg))
## compute output dist
logit = self.generator(pre_logit,attn_dist,enc_batch_extend_vocab if config.pointer_gen else None, extra_zeros, attn_dist_db=None)
## loss: NNL if ptr else Cross entropy
sbow = dec_batch #[batch, seq_len]
seq_len = sbow.size(1)
loss_rec = self.criterion(logit.contiguous().view(-1, logit.size(-1)), dec_batch.contiguous().view(-1))
if config.model=="cvaetrs":
loss_aux = 0
for prob in probs:
sbow_mask = _get_attn_subsequent_mask(seq_len).transpose(1,2)
sbow.unsqueeze(2).repeat(1,1,seq_len).masked_fill_(sbow_mask,config.PAD_idx)#[batch, seq_len, seq_len]
loss_aux+= self.criterion(prob.contiguous().view(-1, prob.size(-1)), sbow.contiguous().view(-1))
kld_loss = gaussian_kld(mean["posterior"], log_var["posterior"],mean["prior"], log_var["prior"])
kld_loss = torch.mean(kld_loss)
kl_weight = min(math.tanh(6 * iter/config.full_kl_step - 3) + 1, 1)
#kl_weight = min(iter/config.full_kl_step, 1) if config.full_kl_step >0 else 1.0
loss = loss_rec + config.kl_ceiling * kl_weight*kld_loss + config.aux_ceiling*loss_aux
elbo = loss_rec+kld_loss
else:
loss = loss_rec
elbo = loss_rec
kld_loss = torch.Tensor([0])
loss_aux = torch.Tensor([0])
loss.backward()
# clip gradient
nn.utils.clip_grad_norm_(self.parameters(), config.max_grad_norm)
self.optimizer.step()
return loss_rec.item(), math.exp(min(loss_rec.item(), 100)), kld_loss.item(), loss_aux.item(), elbo.item()
def decoder_greedy(self, batch, max_dec_step=50):
enc_batch, enc_padding_mask, enc_lens, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(batch)
## Encode
num_sentences, enc_seq_len = enc_batch.size()
batch_size = enc_lens.size(0)
max_len = enc_lens.data.max().item()
input_lengths = torch.sum(~enc_batch.data.eq(config.PAD_idx), dim=1)
# word level encoder
enc_emb = self.embedding(enc_batch)
word_encoder_outpus, word_encoder_hidden = self.word_encoder(enc_emb, input_lengths)
word_encoder_hidden = word_encoder_hidden.transpose(1, 0).reshape(num_sentences, -1)
# pad and pack word_encoder_hidden
start = torch.cumsum(torch.cat((enc_lens.data.new(1).zero_(), enc_lens[:-1])), 0)
word_encoder_hidden = torch.stack([pad(word_encoder_hidden.narrow(0, s, l), max_len)
for s, l in zip(start.data.tolist(), enc_lens.data.tolist())], 0)
mask_src = ~(enc_padding_mask.bool()).unsqueeze(1)
# context level encoder
if word_encoder_hidden.size(-1) != config.hidden_dim:
word_encoder_hidden = self.linear(word_encoder_hidden)
encoder_outputs = self.encoder(word_encoder_hidden, mask_src)
ys = torch.ones(batch_size, 1).fill_(config.SOS_idx).long()
if config.USE_CUDA:
ys = ys.cuda()
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
decoded_words = []
for i in range(max_dec_step+1):
out, attn_dist, _, _,_ = self.decoder(self.embedding(ys), encoder_outputs, None, (mask_src, None, mask_trg))
prob = self.generator(out,attn_dist,enc_batch_extend_vocab, extra_zeros, attn_dist_db=None)
_, next_word = torch.max(prob[:, -1], dim = 1)
decoded_words.append(['<EOS>' if ni.item() == config.EOS_idx else self.vocab.index2word[ni.item()] for ni in next_word.view(-1)])
if config.USE_CUDA:
ys = torch.cat([ys, next_word.unsqueeze(1)], dim=1)
ys = ys.cuda()
else:
ys = torch.cat([ys, next_word.unsqueeze(1)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>': break
else: st+= e + ' '
sent.append(st)
return sent
class Transformer(nn.Module):
def __init__(self,
vocab,
model_file_path=None,
is_eval=False,
load_optim=False):
super(Transformer, self).__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, config.pretrain_emb)
self.encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
## multiple decoders
self.decoder = Decoder(config.emb_dim,
hidden_size=config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter)
self.generator = Generator(config.hidden_dim, self.vocab_size)
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
if config.label_smoothing:
self.criterion = LabelSmoothing(size=self.vocab_size,
padding_idx=config.PAD_idx,
smoothing=0.1)
self.criterion_ppl = nn.NLLLoss(ignore_index=config.PAD_idx)
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if config.noam:
self.optimizer = NoamOpt(
config.hidden_dim, 1, 8000,
torch.optim.Adam(self.parameters(),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
if model_file_path is not None:
print("loading weights")
state = torch.load(model_file_path,
map_location=lambda storage, location: storage)
self.encoder.load_state_dict(state['encoder_state_dict'])
self.decoder.load_state_dict(state['decoder_state_dict'])
self.generator.load_state_dict(state['generator_dict'])
self.embedding.load_state_dict(state['embedding_dict'])
if load_optim:
self.optimizer.load_state_dict(state['optimizer'])
self.eval()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
def save_model(self, running_avg_ppl, iter, f1_g, f1_b, ent_g, ent_b):
state = {
'iter': iter,
'encoder_state_dict': self.encoder.state_dict(),
'decoder_state_dict': self.decoder.state_dict(),
'generator_dict': self.generator.state_dict(),
'embedding_dict': self.embedding.state_dict(),
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl
}
model_save_path = os.path.join(
self.model_dir,
'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(
iter, running_avg_ppl, f1_g, f1_b, ent_g, ent_b))
self.best_path = model_save_path
torch.save(state, model_save_path)
def train_one_batch(self, batch, iter, train=True):
enc_batch = batch["review_batch"]
enc_batch_extend_vocab = batch["review_ext_batch"]
oovs = batch["oovs"]
max_oov_length = len(
sorted(oovs, key=lambda i: len(i), reverse=True)[0])
extra_zeros = Variable(torch.zeros(
(enc_batch.size(0), max_oov_length))).to(config.device)
dec_batch = batch["tags_batch"]
dec_ext_batch = batch["tags_ext_batch"]
if config.noam:
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
## Embedding - context
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(
1) # (bsz, src_len)->(bsz, 1, src_len)
# emb_mask = self.embedding(batch["mask_context"])
# src_emb = self.embedding(enc_batch)+emb_mask
src_emb = self.embedding(enc_batch)
encoder_outputs = self.encoder(src_emb,
mask_src) # (bsz, src_len, emb_dim)
sos_token = torch.LongTensor([config.SOS_idx] *
enc_batch.size(0)).unsqueeze(1).to(
config.device) # (bsz, 1)
dec_batch_shift = torch.cat((sos_token, dec_batch[:, :-1]),
1) # (bsz, tgt_len)
mask_trg = dec_batch_shift.data.eq(config.PAD_idx).unsqueeze(1)
pre_logit, attn_dist = self.decoder(self.embedding(dec_batch_shift),
encoder_outputs,
(mask_src, mask_trg))
logit = self.generator(
pre_logit, attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros)
#logit = F.log_softmax(logit,dim=-1) #fix the name later
## loss: NNL if ptr else Cross entropy
if config.pointer_gen:
loss = self.criterion(logit.contiguous().view(-1, logit.size(-1)),
dec_ext_batch.contiguous().view(-1))
else:
loss = self.criterion(logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1))
if config.label_smoothing:
loss_ppl = self.criterion_ppl(
logit.contiguous().view(-1, logit.size(-1)),
dec_ext_batch.contiguous().view(-1)
if config.pointer_gen else dec_batch.contiguous().view(-1))
if train:
loss.backward()
self.optimizer.step()
if config.label_smoothing:
if torch.isnan(loss_ppl).sum().item() != 0 or torch.isinf(
loss_ppl).sum().item() != 0:
print("check")
pdb.set_trace()
return loss_ppl.item(), math.exp(min(loss_ppl.item(), 100)), 0, 0
else:
return loss.item(), math.exp(min(loss.item(), 100)), 0, 0
def compute_act_loss(self, module):
R_t = module.remainders
N_t = module.n_updates
p_t = R_t + N_t
avg_p_t = torch.sum(torch.sum(p_t, dim=1) / p_t.size(1)) / p_t.size(0)
loss = config.act_loss_weight * avg_p_t.item()
return loss
def decoder_greedy(self, batch, max_dec_step=30):
enc_batch = batch["review_batch"]
enc_batch_extend_vocab = batch["review_ext_batch"]
oovs = batch["oovs"]
max_oov_length = len(
sorted(oovs, key=lambda i: len(i), reverse=True)[0])
extra_zeros = Variable(torch.zeros(
(enc_batch.size(0), max_oov_length))).to(config.device)
## Encode - context
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(
1) # (bsz, src_len)->(bsz, 1, src_len)
# emb_mask = self.embedding(batch["mask_context"])
# src_emb = self.embedding(enc_batch) + emb_mask # todo eos or sentence embedding??
src_emb = self.embedding(enc_batch)
encoder_outputs = self.encoder(src_emb,
mask_src) # (bsz, src_len, emb_dim)
enc_ext_batch = enc_batch_extend_vocab
# ys = torch.ones(1, 1).fill_(config.SOS_idx).long()
ys = torch.zeros(enc_batch.size(0), 1).fill_(config.SOS_idx).long().to(
config.device) # when testing, we set bsz into 1
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
decoded_words = []
for i in range(max_dec_step + 1):
if config.project:
out, attn_dist = self.decoder(
self.embedding_proj_in(self.embedding(ys)),
self.embedding_proj_in(encoder_outputs),
(mask_src, mask_trg))
else:
out, attn_dist = self.decoder(self.embedding(ys),
encoder_outputs,
(mask_src, mask_trg))
prob = self.generator(out, attn_dist, enc_ext_batch, extra_zeros)
_, next_word = torch.max(prob[:, -1], dim=1) # bsz=1
cur_words = []
for i_batch, ni in enumerate(next_word.view(-1)):
if ni.item() == config.EOS_idx:
cur_words.append('<EOS>')
elif ni.item() in self.vocab.index2word:
cur_words.append(self.vocab.index2word[ni.item()])
else:
cur_words.append(oovs[i_batch][ni.item() -
self.vocab.n_words])
decoded_words.append(cur_words)
next_word = next_word.data[0]
if next_word.item() not in self.vocab.index2word:
next_word = torch.tensor(config.UNK_idx)
ys = torch.cat([
ys,
torch.zeros(enc_batch.size(0), 1).long().fill_(next_word).to(
config.device)
],
dim=1).to(config.device)
# if config.USE_CUDA:
# ys = torch.cat([ys, torch.zeros(enc_batch.size(0), 1).long().fill_(next_word).cuda()], dim=1)
# ys = ys.cuda()
# else:
# ys = torch.cat([ys, torch.zeros(enc_batch.size(0), 1).long().fill_(next_word)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>':
break
else:
st += e + ' '
sent.append(st)
return sent
class CvaeNAD(nn.Module):
def __init__(self,
vocab,
emo_number,
model_file_path=None,
is_eval=False,
load_optim=False):
super(CvaeNAD, self).__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, config.pretrain_emb)
self.encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
self.r_encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
if config.num_var_layers > 0:
self.decoder = VarDecoder2(config.emb_dim,
hidden_size=config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter)
else:
self.decoder = VarDecoder3(config.emb_dim,
hidden_size=config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter)
self.generator = Generator(config.hidden_dim, self.vocab_size)
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if (config.noam):
self.optimizer = NoamOpt(
config.hidden_dim, 1, 8000,
torch.optim.Adam(self.parameters(),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
if model_file_path is not None:
print("loading weights")
state = torch.load(model_file_path,
map_location=lambda storage, location: storage)
self.encoder.load_state_dict(state['encoder_state_dict'])
self.r_encoder.load_state_dict(state['r_encoder_state_dict'])
self.decoder.load_state_dict(state['decoder_state_dict'])
self.generator.load_state_dict(state['generator_dict'])
self.embedding.load_state_dict(state['embedding_dict'])
if (load_optim):
self.optimizer.load_state_dict(state['optimizer'])
self.eval()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
def save_model(self, running_avg_ppl, iter, f1_g, f1_b, ent_g, ent_b):
state = {
'iter': iter,
'encoder_state_dict': self.encoder.state_dict(),
'r_encoder_state_dict': self.r_encoder.state_dict(),
'decoder_state_dict': self.decoder.state_dict(),
'generator_dict': self.generator.state_dict(),
'embedding_dict': self.embedding.state_dict(),
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl
}
model_save_path = os.path.join(
self.model_dir,
'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(
iter, running_avg_ppl, f1_g, f1_b, ent_g, ent_b))
self.best_path = model_save_path
torch.save(state, model_save_path)
def train_one_batch(self, batch, iter, train=True):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
dec_batch, _, _, _, _ = get_output_from_batch(batch)
if (config.noam):
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
## Response encode
mask_res = batch["posterior_batch"].data.eq(
config.PAD_idx).unsqueeze(1)
posterior_mask = self.embedding(batch["posterior_mask"])
r_encoder_outputs = self.r_encoder(
self.embedding(batch["posterior_batch"]), mask_res)
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["input_mask"])
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
meta = self.embedding(batch["program_label"])
# Decode
mask_trg = dec_batch.data.eq(config.PAD_idx).unsqueeze(1)
latent_dim = meta.size()[-1]
meta = meta.repeat(1, dec_batch.size(1)).view(dec_batch.size(0),
dec_batch.size(1),
latent_dim)
pre_logit, attn_dist, mean, log_var = self.decoder(
meta, encoder_outputs, r_encoder_outputs,
(mask_src, mask_res, mask_trg))
if not train:
pre_logit, attn_dist, _, _ = self.decoder(
meta, encoder_outputs, None, (mask_src, None, mask_trg))
## compute output dist
logit = self.generator(
pre_logit,
attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros,
attn_dist_db=None)
## loss: NNL if ptr else Cross entropy
loss_rec = self.criterion(logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1))
kld_loss = gaussian_kld(mean["posterior"], log_var["posterior"],
mean["prior"], log_var["prior"])
kld_loss = torch.mean(kld_loss)
kl_weight = min(iter / config.full_kl_step,
1) if config.full_kl_step > 0 else 1.0
loss = loss_rec + config.kl_ceiling * kl_weight * kld_loss
if (train):
loss.backward()
# clip gradient
nn.utils.clip_grad_norm_(self.parameters(), config.max_grad_norm)
self.optimizer.step()
return loss_rec.item(), math.exp(min(loss_rec.item(),
100)), kld_loss.item()
def decoder_greedy(self, batch, max_dec_step=50):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["input_mask"])
meta = self.embedding(batch["program_label"])
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
mask_trg = torch.ones((enc_batch.size(0), 50))
meta_size = meta.size()
meta = meta.repeat(1, 50).view(meta_size[0], 50, meta_size[1])
out, attn_dist, _, _ = self.decoder(meta, encoder_outputs, None,
(mask_src, None, mask_trg))
prob = self.generator(out,
attn_dist,
enc_batch_extend_vocab,
extra_zeros,
attn_dist_db=None)
_, batch_out = torch.max(prob, dim=1)
batch_out = batch_out.data.cpu().numpy()
sentences = []
for sent in batch_out:
st = ''
for w in sent:
if w == config.EOS_idx: break
else: st += self.vocab.index2word[w] + ' '
sentences.append(st)
return sentences
def decoder_greedy_po(self, batch, max_dec_step=50):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
## Response encode
mask_res = batch["posterior_batch"].data.eq(
config.PAD_idx).unsqueeze(1)
posterior_mask = self.embedding(batch["posterior_mask"])
r_encoder_outputs = self.r_encoder(
self.embedding(batch["posterior_batch"]), mask_res)
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["input_mask"])
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
meta = self.embedding(batch["program_label"])
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
mask_trg = torch.ones((enc_batch.size(0), 50))
meta_size = meta.size()
meta = meta.repeat(1, 50).view(meta_size[0], 50, meta_size[1])
out, attn_dist, mean, log_var = self.decoder(
meta, encoder_outputs, r_encoder_outputs,
(mask_src, mask_res, mask_trg))
prob = self.generator(out,
attn_dist,
enc_batch_extend_vocab,
extra_zeros,
attn_dist_db=None)
_, batch_out = torch.max(prob, dim=1)
batch_out = batch_out.data.cpu().numpy()
sentences = []
for sent in batch_out:
st = ''
for w in sent:
if w == config.EOS_idx: break
else: st += self.vocab.index2word[w] + ' '
sentences.append(st)
return sentences
class Transformer(nn.Module):
def __init__(self,
vocab,
emo_number,
model_file_path=None,
is_eval=False,
load_optim=False):
super(Transformer, self).__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, config.pretrain_emb)
self.encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
self.decoder = Decoder(config.emb_dim,
hidden_size=config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter)
self.generator = Generator(config.hidden_dim, self.vocab_size)
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if (config.noam):
self.optimizer = NoamOpt(
config.hidden_dim, 1, 8000,
torch.optim.Adam(self.parameters(),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
if model_file_path is not None:
print("loading weights")
state = torch.load(model_file_path,
map_location=lambda storage, location: storage)
self.encoder.load_state_dict(state['encoder_state_dict'])
self.decoder.load_state_dict(state['decoder_state_dict'])
self.generator.load_state_dict(state['generator_dict'])
self.embedding.load_state_dict(state['embedding_dict'])
if (load_optim):
self.optimizer.load_state_dict(state['optimizer'])
self.eval()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
def save_model(self, running_avg_ppl, iter, f1_g, f1_b, ent_g, ent_b):
state = {
'iter': iter,
'encoder_state_dict': self.encoder.state_dict(),
'decoder_state_dict': self.decoder.state_dict(),
'generator_dict': self.generator.state_dict(),
'embedding_dict': self.embedding.state_dict(),
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl
}
model_save_path = os.path.join(
self.model_dir,
'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(
iter, running_avg_ppl, f1_g, f1_b, ent_g, ent_b))
self.best_path = model_save_path
torch.save(state, model_save_path)
def train_one_batch(self, batch, iter, train=True):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
dec_batch, _, _, _, _ = get_output_from_batch(batch)
if (config.noam):
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
meta = self.embedding(batch["program_label"])
emb_mask = self.embedding(batch["input_mask"])
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
# Decode
sos_token = torch.LongTensor([config.SOS_idx] *
enc_batch.size(0)).unsqueeze(1)
if config.USE_CUDA: sos_token = sos_token.cuda()
dec_batch_shift = torch.cat((sos_token, dec_batch[:, :-1]), 1)
mask_trg = dec_batch_shift.data.eq(config.PAD_idx).unsqueeze(1)
pre_logit, attn_dist = self.decoder(
self.embedding(dec_batch_shift) + meta.unsqueeze(1),
encoder_outputs, (mask_src, mask_trg))
#+meta.unsqueeze(1)
## compute output dist
logit = self.generator(
pre_logit,
attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros,
attn_dist_db=None)
#logit = F.log_softmax(logit,dim=-1) #fix the name later
## loss: NNL if ptr else Cross entropy
loss = self.criterion(logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1))
if (train):
loss.backward()
self.optimizer.step()
return loss.item(), math.exp(min(loss.item(), 100)), 0
def compute_act_loss(self, module):
R_t = module.remainders
N_t = module.n_updates
p_t = R_t + N_t
avg_p_t = torch.sum(torch.sum(p_t, dim=1) / p_t.size(1)) / p_t.size(0)
loss = config.act_loss_weight * avg_p_t.item()
return loss
def decoder_greedy(self, batch, max_dec_step=50):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["input_mask"])
meta = self.embedding(batch["program_label"])
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
ys = torch.ones(enc_batch.shape[0], 1).fill_(config.SOS_idx).long()
if config.USE_CUDA:
ys = ys.cuda()
# print('=====================ys========================')
# print(ys)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
decoded_words = []
for i in range(max_dec_step + 1):
out, attn_dist = self.decoder(
self.embedding(ys) + meta.unsqueeze(1), encoder_outputs,
(mask_src, mask_trg))
prob = self.generator(out,
attn_dist,
enc_batch_extend_vocab,
extra_zeros,
attn_dist_db=None)
_, next_word = torch.max(prob[:, -1], dim=1)
# print('=====================next_word1========================')
# print(next_word)
decoded_words.append([
'<EOS>' if ni.item() == config.EOS_idx else
self.vocab.index2word[ni.item()] for ni in next_word.view(-1)
])
#next_word = next_word.data[0]
# print('=====================next_word2========================')
# print(next_word)
if config.USE_CUDA:
# print('=====================shape========================')
# print(ys.shape, next_word.shape)
ys = torch.cat([ys, next_word.unsqueeze(1)], dim=1)
ys = ys.cuda()
else:
ys = torch.cat([ys, next_word.unsqueeze(1)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
# print('=====================new_ys========================')
# print(ys)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>': break
else: st += e + ' '
sent.append(st)
return sent
def decoder_greedy_po(self, batch, max_dec_step=50):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["input_mask"])
meta = self.embedding(batch["program_label"])
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
ys = torch.ones(enc_batch.shape[0], 1).fill_(config.SOS_idx).long()
if config.USE_CUDA:
ys = ys.cuda()
# print('=====================ys========================')
# print(ys)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
decoded_words = []
for i in range(max_dec_step + 1):
out, attn_dist = self.decoder(
self.embedding(ys) + meta.unsqueeze(1), encoder_outputs,
(mask_src, mask_trg))
prob = self.generator(out,
attn_dist,
enc_batch_extend_vocab,
extra_zeros,
attn_dist_db=None)
_, next_word = torch.max(prob[:, -1], dim=1)
# print('=====================next_word1========================')
# print(next_word)
decoded_words.append([
'<EOS>' if ni.item() == config.EOS_idx else
self.vocab.index2word[ni.item()] for ni in next_word.view(-1)
])
#next_word = next_word.data[0]
# print('=====================next_word2========================')
# print(next_word)
if config.USE_CUDA:
# print('=====================shape========================')
# print(ys.shape, next_word.shape)
ys = torch.cat([ys, next_word.unsqueeze(1)], dim=1)
ys = ys.cuda()
else:
ys = torch.cat([ys, next_word.unsqueeze(1)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
# print('=====================new_ys========================')
# print(ys)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>': break
else: st += e + ' '
sent.append(st)
return sent
class Train_MIME(nn.Module):
'''
for emotion attention, simply pass the randomly sampled emotion as the Q in a decoder block of transformer
'''
def __init__(self,
vocab,
decoder_number,
model_file_path=None,
is_eval=False,
load_optim=False):
super().__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, config.pretrain_emb)
self.encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
self.decoder_number = decoder_number
self.decoder = DecoderContextV(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter)
self.vae_sampler = VAESampling(config.hidden_dim,
config.hidden_dim,
out_dim=300)
# outputs m
self.emotion_input_encoder_1 = EmotionInputEncoder(
config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal,
emo_input=config.emo_input)
# outputs m~
self.emotion_input_encoder_2 = EmotionInputEncoder(
config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal,
emo_input=config.emo_input)
if config.emo_combine == "att":
self.cdecoder = ComplexResDecoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
elif config.emo_combine == "gate":
self.cdecoder = ComplexResGate(config.emb_dim)
self.s_weight = nn.Linear(config.hidden_dim,
config.emb_dim,
bias=False)
self.decoder_key = nn.Linear(config.hidden_dim,
decoder_number,
bias=False)
# v^T tanh(W E[i] + H c + b)
method3 = True
if method3:
self.e_weight = nn.Linear(config.emb_dim,
config.emb_dim,
bias=True)
self.v = torch.rand(config.emb_dim, requires_grad=True)
if config.USE_CUDA: self.v = self.v.cuda()
self.generator = Generator(config.hidden_dim, self.vocab_size)
self.emoji_embedding = nn.Embedding(32, config.emb_dim)
if config.init_emo_emb: self.init_emoji_embedding_with_glove()
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
if (config.label_smoothing):
self.criterion = LabelSmoothing(size=self.vocab_size,
padding_idx=config.PAD_idx,
smoothing=0.1)
self.criterion_ppl = nn.NLLLoss(ignore_index=config.PAD_idx)
if config.softmax:
self.attention_activation = nn.Softmax(dim=1)
else:
self.attention_activation = nn.Sigmoid() # nn.Softmax()
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if (config.noam):
self.optimizer = NoamOpt(
config.hidden_dim, 1, 8000,
torch.optim.Adam(self.parameters(),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
if model_file_path is not None:
print("loading weights")
state = torch.load(model_file_path,
map_location=lambda storage, location: storage)
self.load_state_dict(state['model'])
if (load_optim):
self.optimizer.load_state_dict(state['optimizer'])
self.eval()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
# Added positive emotions
self.positive_emotions = [
11, 16, 6, 8, 3, 1, 28, 13, 31, 17, 24, 0, 27
]
self.negative_emotions = [
9, 4, 2, 22, 14, 30, 29, 25, 15, 10, 23, 19, 18, 21, 7, 20, 5, 26,
12
]
def init_emoji_embedding_with_glove(self):
self.emotions = [
'surprised', 'excited', 'annoyed', 'proud', 'angry', 'sad',
'grateful', 'lonely', 'impressed', 'afraid', 'disgusted',
'confident', 'terrified', 'hopeful', 'anxious', 'disappointed',
'joyful', 'prepared', 'guilty', 'furious', 'nostalgic', 'jealous',
'anticipating', 'embarrassed', 'content', 'devastated',
'sentimental', 'caring', 'trusting', 'ashamed', 'apprehensive',
'faithful'
]
self.emotion_index = [self.vocab.word2index[i] for i in self.emotions]
self.emoji_embedding_init = self.embedding(
torch.Tensor(self.emotion_index).long())
self.emoji_embedding.weight.data = self.emoji_embedding_init
self.emoji_embedding.weight.requires_grad = True
def save_model(self, running_avg_ppl, iter, f1_g, f1_b, ent_g, ent_b,
ent_t):
state = {
'iter': iter,
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl,
'model': self.state_dict()
}
model_save_path = os.path.join(
self.model_dir,
'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(
iter, running_avg_ppl, f1_g, f1_b, ent_g, ent_b, ent_t))
self.best_path = model_save_path
torch.save(state, model_save_path)
def random_sampling(self, e):
p = np.random.choice(self.positive_emotions)
n = np.random.choice(self.negative_emotions)
if e in self.positive_emotions:
mimic = p
mimic_t = n
else:
mimic = n
mimic_t = p
return mimic, mimic_t
def train_one_batch(self, batch, iter, train=True):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
dec_batch, _, _, _, _ = get_output_from_batch(batch)
if (config.noam):
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
if config.dataset == "empathetic":
emb_mask = self.embedding(batch["mask_input"])
encoder_outputs = self.encoder(
self.embedding(enc_batch) + emb_mask, mask_src)
else:
encoder_outputs = self.encoder(self.embedding(enc_batch), mask_src)
q_h = torch.mean(encoder_outputs,
dim=1) if config.mean_query else encoder_outputs[:, 0]
# q_h = torch.max(encoder_outputs, dim=1)
emotions_mimic, emotions_non_mimic, mu_positive_prior, logvar_positive_prior, mu_negative_prior, logvar_negative_prior = \
self.vae_sampler(q_h, batch['program_label'], self.emoji_embedding)
# KLLoss = -0.5 * (torch.sum(1 + logvar_n - mu_n.pow(2) - logvar_n.exp()) + torch.sum(1 + logvar_p - mu_p.pow(2) - logvar_p.exp()))
m_out = self.emotion_input_encoder_1(emotions_mimic.unsqueeze(1),
encoder_outputs, mask_src)
m_tilde_out = self.emotion_input_encoder_2(
emotions_non_mimic.unsqueeze(1), encoder_outputs, mask_src)
if train:
emotions_mimic, emotions_non_mimic, mu_positive_posterior, logvar_positive_posterior, mu_negative_posterior, logvar_negative_posterior = \
self.vae_sampler.forward_train(q_h, batch['program_label'], self.emoji_embedding, M_out=m_out.mean(dim=1), M_tilde_out=m_tilde_out.mean(dim=1))
KLLoss_positive = self.vae_sampler.kl_div(
mu_positive_posterior, logvar_positive_posterior,
mu_positive_prior, logvar_positive_prior)
KLLoss_negative = self.vae_sampler.kl_div(
mu_negative_posterior, logvar_negative_posterior,
mu_negative_prior, logvar_negative_prior)
KLLoss = KLLoss_positive + KLLoss_negative
else:
KLLoss_positive = self.vae_sampler.kl_div(mu_positive_prior,
logvar_positive_prior)
KLLoss_negative = self.vae_sampler.kl_div(mu_negative_prior,
logvar_negative_prior)
KLLoss = KLLoss_positive + KLLoss_negative
if config.emo_combine == "att":
v = self.cdecoder(encoder_outputs, m_out, m_tilde_out, mask_src)
elif config.emo_combine == "gate":
v = self.cdecoder(m_out, m_tilde_out)
x = self.s_weight(q_h)
# method2: E (W@c)
logit_prob = torch.matmul(x, self.emoji_embedding.weight.transpose(
0, 1)) # shape (b_size, 32)
# Decode
sos_token = torch.LongTensor([config.SOS_idx] *
enc_batch.size(0)).unsqueeze(1)
if config.USE_CUDA: sos_token = sos_token.cuda()
dec_batch_shift = torch.cat((sos_token, dec_batch[:, :-1]), 1)
mask_trg = dec_batch_shift.data.eq(config.PAD_idx).unsqueeze(1)
pre_logit, attn_dist = self.decoder(self.embedding(dec_batch_shift), v,
v, (mask_src, mask_trg))
## compute output dist
logit = self.generator(
pre_logit,
attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros,
attn_dist_db=None)
if (train and config.schedule > 10):
if (random.uniform(0, 1) <=
(0.0001 +
(1 - 0.0001) * math.exp(-1. * iter / config.schedule))):
config.oracle = True
else:
config.oracle = False
if config.softmax:
program_label = torch.LongTensor(batch['program_label'])
if config.USE_CUDA: program_label = program_label.cuda()
if config.emo_combine == 'gate':
L1_loss = nn.CrossEntropyLoss()(logit_prob, program_label)
loss = self.criterion(
logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1)) + KLLoss + L1_loss
else:
L1_loss = nn.CrossEntropyLoss()(
logit_prob, torch.LongTensor(batch['program_label'])
if not config.USE_CUDA else torch.LongTensor(
batch['program_label']).cuda())
loss = self.criterion(
logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1)) + KLLoss + L1_loss
loss_bce_program = nn.CrossEntropyLoss()(logit_prob,
program_label).item()
else:
loss = self.criterion(
logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1)) + nn.BCEWithLogitsLoss()(
logit_prob, torch.FloatTensor(
batch['target_program']).cuda())
loss_bce_program = nn.BCEWithLogitsLoss()(
logit_prob,
torch.FloatTensor(batch['target_program']).cuda()).item()
pred_program = np.argmax(logit_prob.detach().cpu().numpy(), axis=1)
program_acc = accuracy_score(batch["program_label"], pred_program)
if (config.label_smoothing):
loss_ppl = self.criterion_ppl(
logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1)).item()
if (train):
loss.backward()
self.optimizer.step()
if (config.label_smoothing):
return loss_ppl, math.exp(min(loss_ppl,
100)), loss_bce_program, program_acc
else:
return loss.item(), math.exp(min(
loss.item(), 100)), loss_bce_program, program_acc
def compute_act_loss(self, module):
R_t = module.remainders
N_t = module.n_updates
p_t = R_t + N_t
avg_p_t = torch.sum(torch.sum(p_t, dim=1) / p_t.size(1)) / p_t.size(0)
loss = config.act_loss_weight * avg_p_t.item()
return loss
def decoder_greedy(self,
batch,
max_dec_step=30,
emotion_classifier='built_in'):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
emotions = batch['program_label']
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["mask_input"])
encoder_outputs = self.encoder(
self.embedding(enc_batch) + emb_mask, mask_src)
q_h = torch.mean(encoder_outputs,
dim=1) if config.mean_query else encoder_outputs[:, 0]
# method 2
x = self.s_weight(q_h)
logit_prob = torch.matmul(x,
self.emoji_embedding.weight.transpose(0, 1))
emo_pred = torch.argmax(logit_prob, dim=-1)
if emotion_classifier == "vader":
context_emo = [
self.positive_emotions[0]
if d['compound'] > 0 else self.negative_emotions[0]
for d in batch['context_emotion_scores']
]
context_emo = torch.Tensor(context_emo)
if config.USE_CUDA:
context_emo = context_emo.cuda()
emotions_mimic, emotions_non_mimic, mu_p, logvar_p, mu_n, logvar_n = self.vae_sampler(
q_h, context_emo, self.emoji_embedding)
elif emotion_classifier == None:
emotions_mimic, emotions_non_mimic, mu_p, logvar_p, mu_n, logvar_n = self.vae_sampler(
q_h, batch['program_label'], self.emoji_embedding)
elif emotion_classifier == "built_in":
emotions_mimic, emotions_non_mimic, mu_p, logvar_p, mu_n, logvar_n = self.vae_sampler(
q_h, emo_pred, self.emoji_embedding)
m_out = self.emotion_input_encoder_1(emotions_mimic.unsqueeze(1),
encoder_outputs, mask_src)
m_tilde_out = self.emotion_input_encoder_2(
emotions_non_mimic.unsqueeze(1), encoder_outputs, mask_src)
if config.emo_combine == "att":
v = self.cdecoder(encoder_outputs, m_out, m_tilde_out, mask_src)
# v = self.cdecoder(encoder_outputs, m_out, m_tilde_out, mask_src_chosen)
elif config.emo_combine == "gate":
v = self.cdecoder(m_out, m_tilde_out)
elif config.emo_combine == 'vader':
m_weight = context_emo_scores.unsqueeze(-1).unsqueeze(-1)
m_tilde_weight = 1 - m_weight
v = m_weight * m_weight + m_tilde_weight * m_tilde_out
ys = torch.ones(1, 1).fill_(config.SOS_idx).long()
if config.USE_CUDA:
ys = ys.cuda()
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
decoded_words = []
for i in range(max_dec_step + 1):
if (config.project):
out, attn_dist = self.decoder(
self.embedding_proj_in(self.embedding(ys)),
self.embedding_proj_in(encoder_outputs),
self.embedding_proj_in(v), (mask_src, mask_trg),
attention_parameters)
else:
out, attn_dist = self.decoder(self.embedding(ys), v, v,
(mask_src, mask_trg))
logit = self.generator(out,
attn_dist,
enc_batch_extend_vocab,
extra_zeros,
attn_dist_db=None)
_, next_word = torch.max(logit[:, -1], dim=1)
decoded_words.append([
'<EOS>' if ni.item() == config.EOS_idx else
self.vocab.index2word[ni.item()] for ni in next_word.view(-1)
])
next_word = next_word.data[0]
if config.USE_CUDA:
ys = torch.cat(
[ys, torch.ones(1, 1).long().fill_(next_word).cuda()],
dim=1)
ys = ys.cuda()
else:
ys = torch.cat(
[ys, torch.ones(1, 1).long().fill_(next_word)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>':
break
else:
st += e + ' '
sent.append(st)
return sent, batch['context_emotion_scores'][0]['compound'], int(
emo_pred[0].data.cpu())
def decoder_topk(self,
batch,
max_dec_step=30,
emotion_classifier='built_in'):
enc_batch, _, _, enc_batch_extend_vocab, extra_zeros, _, _ = get_input_from_batch(
batch)
emotions = batch['program_label']
context_emo = [
self.positive_emotions[0]
if d['compound'] > 0 else self.negative_emotions[0]
for d in batch['context_emotion_scores']
]
context_emo = torch.Tensor(context_emo)
if config.USE_CUDA:
context_emo = context_emo.cuda()
## Encode
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(1)
emb_mask = self.embedding(batch["mask_input"])
encoder_outputs = self.encoder(
self.embedding(enc_batch) + emb_mask, mask_src)
q_h = torch.mean(encoder_outputs,
dim=1) if config.mean_query else encoder_outputs[:, 0]
x = self.s_weight(q_h)
# method 2
logit_prob = torch.matmul(x,
self.emoji_embedding.weight.transpose(0, 1))
if emotion_classifier == "vader":
context_emo = [
self.positive_emotions[0]
if d['compound'] > 0 else self.negative_emotions[0]
for d in batch['context_emotion_scores']
]
context_emo = torch.Tensor(context_emo)
if config.USE_CUDA:
context_emo = context_emo.cuda()
emotions_mimic, emotions_non_mimic, mu_p, logvar_p, mu_n, logvar_n = self.vae_sampler(
q_h, context_emo, self.emoji_embedding)
elif emotion_classifier == None:
emotions_mimic, emotions_non_mimic, mu_p, logvar_p, mu_n, logvar_n = self.vae_sampler(
q_h, batch['program_label'], self.emoji_embedding)
elif emotion_classifier == "built_in":
emo_pred = torch.argmax(logit_prob, dim=-1)
emotions_mimic, emotions_non_mimic, mu_p, logvar_p, mu_n, logvar_n = self.vae_sampler(
q_h, emo_pred, self.emoji_embedding)
m_out = self.emotion_input_encoder_1(emotions_mimic.unsqueeze(1),
encoder_outputs, mask_src)
m_tilde_out = self.emotion_input_encoder_2(
emotions_non_mimic.unsqueeze(1), encoder_outputs, mask_src)
if config.emo_combine == "att":
v = self.cdecoder(encoder_outputs, m_out, m_tilde_out, mask_src)
elif config.emo_combine == "gate":
v = self.cdecoder(m_out, m_tilde_out)
elif config.emo_combine == 'vader':
m_weight = context_emo_scores.unsqueeze(-1).unsqueeze(-1)
m_tilde_weight = 1 - m_weight
v = m_weight * m_weight + m_tilde_weight * m_tilde_out
ys = torch.ones(1, 1).fill_(config.SOS_idx).long()
if config.USE_CUDA:
ys = ys.cuda()
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
decoded_words = []
for i in range(max_dec_step + 1):
if (config.project):
out, attn_dist = self.decoder(
self.embedding_proj_in(self.embedding(ys)),
self.embedding_proj_in(encoder_outputs),
(mask_src, mask_trg), attention_parameters)
else:
out, attn_dist = self.decoder(self.embedding(ys), v, v,
(mask_src, mask_trg))
logit = self.generator(out,
attn_dist,
enc_batch_extend_vocab,
extra_zeros,
attn_dist_db=None)
filtered_logit = top_k_top_p_filtering(logit[:, -1],
top_k=3,
top_p=0,
filter_value=-float('Inf'))
# Sample from the filtered distribution
next_word = torch.multinomial(F.softmax(filtered_logit, dim=-1),
1).squeeze()
decoded_words.append([
'<EOS>' if ni.item() == config.EOS_idx else
self.vocab.index2word[ni.item()] for ni in next_word.view(-1)
])
next_word = next_word.data.item()
if config.USE_CUDA:
ys = torch.cat(
[ys, torch.ones(1, 1).long().fill_(next_word).cuda()],
dim=1)
ys = ys.cuda()
else:
ys = torch.cat(
[ys, torch.ones(1, 1).long().fill_(next_word)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>':
break
else:
st += e + ' '
sent.append(st)
return sent
class woRCR(nn.Module):
def __init__(self,
vocab,
model_file_path=None,
is_eval=False,
load_optim=False):
super(woRCR, self).__init__()
self.vocab = vocab
self.vocab_size = vocab.n_words
self.embedding = share_embedding(self.vocab, config.pretrain_emb)
self.encoder = Encoder(config.emb_dim,
config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter,
universal=config.universal)
self.sse = SSE(vocab, config.emb_dim, config.dropout,
config.rnn_hidden_dim)
self.rcr = RCR()
self.decoder = Decoder(config.emb_dim,
hidden_size=config.hidden_dim,
num_layers=config.hop,
num_heads=config.heads,
total_key_depth=config.depth,
total_value_depth=config.depth,
filter_size=config.filter)
self.generator = Generator(config.hidden_dim, self.vocab_size)
if config.weight_sharing:
# Share the weight matrix between target word embedding & the final logit dense layer
self.generator.proj.weight = self.embedding.lut.weight
self.criterion = nn.NLLLoss(ignore_index=config.PAD_idx)
if config.label_smoothing:
self.criterion = LabelSmoothing(size=self.vocab_size,
padding_idx=config.PAD_idx,
smoothing=0.1)
self.criterion_ppl = nn.NLLLoss(ignore_index=config.PAD_idx)
self.optimizer = torch.optim.Adam(self.parameters(), lr=config.lr)
if config.noam:
self.optimizer = NoamOpt(
config.hidden_dim, 1, 8000,
torch.optim.Adam(self.parameters(),
lr=0,
betas=(0.9, 0.98),
eps=1e-9))
if model_file_path is not None:
print("loading weights")
state = torch.load(model_file_path,
map_location=lambda storage, location: storage)
self.encoder.load_state_dict(state['encoder_state_dict'])
self.decoder.load_state_dict(state['decoder_state_dict'])
self.generator.load_state_dict(state['generator_dict'])
self.embedding.load_state_dict(state['embedding_dict'])
if load_optim:
self.optimizer.load_state_dict(state['optimizer'])
self.eval()
self.model_dir = config.save_path
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
self.best_path = ""
def save_model(self, running_avg_ppl, iter, f1_g, f1_b, ent_g, ent_b):
state = {
'iter': iter,
'encoder_state_dict': self.encoder.state_dict(),
'decoder_state_dict': self.decoder.state_dict(),
'generator_dict': self.generator.state_dict(),
'embedding_dict': self.embedding.state_dict(),
'optimizer': self.optimizer.state_dict(),
'current_loss': running_avg_ppl
}
model_save_path = os.path.join(
self.model_dir,
'model_{}_{:.4f}_{:.4f}_{:.4f}_{:.4f}_{:.4f}'.format(
iter, running_avg_ppl, f1_g, f1_b, ent_g, ent_b))
self.best_path = model_save_path
torch.save(state, model_save_path)
def train_one_batch(self, batch, iter, train=True):
enc_batch = batch["review_batch"]
enc_batch_extend_vocab = batch["review_ext_batch"]
src_batch = batch[
'reviews_batch'] # reviews sequence (bsz, r_num, r_len)
src_mask = batch[
'reviews_mask'] # indicate which review is fake(for padding). (bsz, r_num)
src_length = batch['reviews_length'] # (bsz, r_num)
enc_length_batch = batch[
'reviews_length_list'] # 2-dim list, 0: len=bsz, 1: lens of reviews and pads
src_labels = batch['reviews_label'] # (bsz, r_num)
oovs = batch["oovs"]
max_oov_length = len(
sorted(oovs, key=lambda i: len(i), reverse=True)[0])
extra_zeros = Variable(torch.zeros(
(enc_batch.size(0), max_oov_length))).to(config.device)
dec_batch = batch["tags_batch"]
dec_ext_batch = batch["tags_ext_batch"]
tid_batch = batch[
'tags_idx_batch'] # tag indexes sequence (bsz, tgt_len)
if config.noam:
self.optimizer.optimizer.zero_grad()
else:
self.optimizer.zero_grad()
# 1. Sentence-level Salience Estimation (SSE)
cla_loss, sa_scores, sa_acc = self.sse.salience_estimate(
src_batch, src_mask, src_length,
src_labels) # sa_scores: (bsz, r_num)
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(
1) # (bsz, src_len)->(bsz, 1, src_len)
# emb_mask = self.embedding(batch["mask_context"])
# src_emb = self.embedding(enc_batch)+emb_mask
src_emb = self.embedding(enc_batch)
encoder_outputs = self.encoder(src_emb,
mask_src) # (bsz, src_len, emb_dim)
sos_token = torch.LongTensor([config.SOS_idx] *
enc_batch.size(0)).unsqueeze(1).to(
config.device) # (bsz, 1)
dec_batch_shift = torch.cat((sos_token, dec_batch[:, :-1]),
1) # (bsz, tgt_len)
mask_trg = dec_batch_shift.data.eq(config.PAD_idx).unsqueeze(1)
pre_logit, attn_dist, aln_loss = self.decoder(
inputs=self.embedding(dec_batch_shift),
inputs_rank=tid_batch,
encoder_output=encoder_outputs,
mask=(mask_src, mask_trg))
logit = self.generator(
pre_logit, attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros)
if config.pointer_gen:
loss = self.criterion(logit.contiguous().view(-1, logit.size(-1)),
dec_ext_batch.contiguous().view(-1))
else:
loss = self.criterion(logit.contiguous().view(-1, logit.size(-1)),
dec_batch.contiguous().view(-1))
if config.label_smoothing:
loss_ppl = self.criterion_ppl(
logit.contiguous().view(-1, logit.size(-1)),
dec_ext_batch.contiguous().view(-1)
if config.pointer_gen else dec_batch.contiguous().view(-1))
loss = loss + cla_loss
if torch.isnan(loss).sum().item() != 0 or torch.isinf(
loss).sum().item() != 0:
print("check")
pdb.set_trace()
if train:
loss.backward()
self.optimizer.step()
if config.label_smoothing:
loss_ppl = loss_ppl.item()
cla_loss = cla_loss.item()
return loss_ppl, math.exp(min(loss_ppl, 100)), cla_loss, sa_acc
else:
return loss.item(), math.exp(min(loss.item(),
100)), cla_loss, sa_acc
def decoder_greedy(self, batch, max_dec_step=30):
enc_batch = batch["review_batch"]
enc_batch_extend_vocab = batch["review_ext_batch"]
src_batch = batch[
'reviews_batch'] # reviews sequence (bsz, r_num, r_len)
src_mask = batch[
'reviews_mask'] # indicate which review is fake(for padding). (bsz, r_num)
src_length = batch['reviews_length'] # (bsz, r_num)
enc_length_batch = batch[
'reviews_length_list'] # 2-dim list, 0: len=bsz, 1: lens of reviews and pads
src_labels = batch['reviews_label'] # (bsz, r_num)
oovs = batch["oovs"]
max_oov_length = len(
sorted(oovs, key=lambda i: len(i), reverse=True)[0])
extra_zeros = Variable(torch.zeros(
(enc_batch.size(0), max_oov_length))).to(config.device)
mask_src = enc_batch.data.eq(config.PAD_idx).unsqueeze(
1) # (bsz, src_len)->(bsz, 1, src_len)
# emb_mask = self.embedding(batch["mask_context"])
# src_emb = self.embedding(enc_batch) + emb_mask # todo eos or sentence embedding??
src_emb = self.embedding(enc_batch)
encoder_outputs = self.encoder(src_emb,
mask_src) # (bsz, src_len, emb_dim)
ys = torch.zeros(enc_batch.size(0), 1).fill_(config.SOS_idx).long().to(
config.device) # when testing, we set bsz into 1
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
ys_rank = torch.ones(enc_batch.size(0), 1).long().to(config.device)
last_rank = torch.ones(enc_batch.size(0), 1).long().to(config.device)
decoded_words = []
for i in range(max_dec_step + 1):
if config.project:
out, attn_dist, aln_loss = self.decoder(
inputs=self.embedding_proj_in(self.embedding(ys)),
inputs_rank=ys_rank,
encoder_output=self.embedding_proj_in(encoder_outputs),
mask=(mask_src, mask_trg))
else:
out, attn_dist, aln_loss = self.decoder(
inputs=self.embedding(ys),
inputs_rank=ys_rank,
encoder_output=encoder_outputs,
mask=(mask_src, mask_trg))
prob = self.generator(
out, attn_dist,
enc_batch_extend_vocab if config.pointer_gen else None,
extra_zeros)
_, next_word = torch.max(prob[:, -1], dim=1) # bsz=1
cur_words = []
for i_batch, ni in enumerate(next_word.view(-1)):
if ni.item() == config.EOS_idx:
cur_words.append('<EOS>')
last_rank[i_batch] = 0
elif ni.item() in self.vocab.index2word:
cur_words.append(self.vocab.index2word[ni.item()])
if ni.item() == config.SOS_idx:
last_rank[i_batch] += 1
else:
cur_words.append(oovs[i_batch][ni.item() -
self.vocab.n_words])
decoded_words.append(cur_words)
next_word = next_word.data[0]
if next_word.item() not in self.vocab.index2word:
next_word = torch.tensor(config.UNK_idx)
ys = torch.cat([
ys,
torch.zeros(enc_batch.size(0), 1).long().fill_(next_word).to(
config.device)
],
dim=1).to(config.device)
ys_rank = torch.cat([ys_rank, last_rank], dim=1).to(config.device)
# if config.USE_CUDA:
# ys = torch.cat([ys, torch.zeros(enc_batch.size(0), 1).long().fill_(next_word).cuda()], dim=1)
# ys = ys.cuda()
# else:
# ys = torch.cat([ys, torch.zeros(enc_batch.size(0), 1).long().fill_(next_word)], dim=1)
mask_trg = ys.data.eq(config.PAD_idx).unsqueeze(1)
sent = []
for _, row in enumerate(np.transpose(decoded_words)):
st = ''
for e in row:
if e == '<EOS>':
break
else:
st += e + ' '
sent.append(st)
return sent
