def __init__(self, opt):
super(RelGANInstructor, self).__init__(opt)
# generator, discriminator
self.gen = RelGAN_G(cfg.mem_slots,
cfg.num_heads,
cfg.head_size,
cfg.gen_embed_dim,
cfg.gen_hidden_dim,
cfg.vocab_size,
cfg.max_seq_len,
cfg.padding_idx,
gpu=cfg.CUDA)
self.dis = RelGAN_D(cfg.dis_embed_dim,
cfg.max_seq_len,
cfg.num_rep,
cfg.vocab_size,
cfg.padding_idx,
gpu=cfg.CUDA)
self.init_model()
# Optimizer
self.gen_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_lr)
self.gen_adv_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_adv_lr)
self.dis_opt = optim.Adam(self.dis.parameters(), lr=cfg.dis_lr)
# Criterion
self.mle_criterion = nn.NLLLoss()
# DataLoader
self.gen_data = GenDataIter(
self.gen.sample(cfg.batch_size, cfg.batch_size))
def __init__(self, opt):
super(RelGANInstructor, self).__init__(opt)
# generator, discriminator
self.gen = RelGAN_G(cfg.mem_slots,
cfg.num_heads,
cfg.head_size,
cfg.gen_embed_dim,
cfg.gen_hidden_dim,
cfg.vocab_size,
cfg.max_seq_len,
cfg.padding_idx,
gpu=cfg.CUDA)
self.dis = RelGAN_D(cfg.dis_embed_dim,
cfg.max_seq_len,
cfg.num_rep,
cfg.vocab_size,
cfg.padding_idx,
gpu=cfg.CUDA)
self.init_model()
# Optimizer
self.gen_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_lr)
self.gen_adv_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_adv_lr)
self.dis_opt = optim.Adam(self.dis.parameters(), lr=cfg.dis_lr)
def __init__(self, opt):
super(RelGANInstructor, self).__init__(opt)
# generator, discriminator
self.gen = RelGAN_G(cfg.mem_slots, cfg.num_heads, cfg.head_size, cfg.gen_embed_dim, cfg.gen_hidden_dim,
cfg.vocab_size, cfg.max_seq_len, cfg.padding_idx, gpu=cfg.CUDA)
self.dis = RelGAN_D(cfg.dis_embed_dim, cfg.max_seq_len, cfg.num_rep, cfg.vocab_size, cfg.padding_idx,
gpu=cfg.CUDA)
self.init_model()
# Optimizer
self.gen_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_lr)
self.gen_adv_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_adv_lr)
self.dis_opt = optim.Adam(self.dis.parameters(), lr=cfg.dis_lr)
# Criterion
self.mle_criterion = nn.NLLLoss()
self.adv_criterion = nn.BCEWithLogitsLoss()
# DataLoader
self.gen_data = GenDataIter(self.gen.sample(cfg.batch_size, cfg.batch_size))
# Metrics
self.bleu = BLEU(test_text=tensor_to_tokens(self.gen_data.target, self.index_word_dict),
real_text=tensor_to_tokens(self.test_data.target, self.test_data.index_word_dict),
gram=[2, 3, 4, 5])
self.self_bleu = BLEU(test_text=tensor_to_tokens(self.gen_data.target, self.index_word_dict),
real_text=tensor_to_tokens(self.gen_data.target, self.index_word_dict),
gram=3)
def __init__(self, opt):
super(RelGANInstructor, self).__init__(opt)
norm = opt.norm
assert norm in ['none', 'spectral', 'gradnorm', 'gp']
# generator, discriminator
print('norm ', norm)
self.norm = norm
self.gen = RelGAN_G(cfg.mem_slots,
cfg.num_heads,
cfg.head_size,
cfg.gen_embed_dim,
cfg.gen_hidden_dim,
cfg.vocab_size,
cfg.max_seq_len,
cfg.padding_idx,
gpu=cfg.CUDA)
self.dis = RelGAN_D(cfg.dis_embed_dim,
cfg.max_seq_len,
cfg.num_rep,
cfg.vocab_size,
cfg.padding_idx,
gpu=cfg.CUDA,
norm=norm).cuda()
if norm == 'gradnorm':
print('use gradnorm')
self.dis = GradNorm(self.dis).cuda()
self.init_model()
# Optimizer
if norm == 'gradnorm':
self.gen_opt = optim.Adam(self.gen.parameters(),
lr=cfg.gen_lr,
betas=(0.5, 0.999))
self.gen_adv_opt = optim.Adam(self.gen.parameters(),
lr=cfg.gen_adv_lr,
betas=(0.5, 0.999))
self.dis_opt = optim.Adam(self.dis.parameters(),
lr=cfg.dis_lr,
betas=(0.5, 0.999))
else:
self.gen_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_lr)
self.gen_adv_opt = optim.Adam(self.gen.parameters(),
lr=cfg.gen_adv_lr)
self.dis_opt = optim.Adam(self.dis.parameters(), lr=cfg.dis_lr)
os.makedirs(cfg.log_filename.replace('.txt', ''), exist_ok=True)
self.logger = SummaryWriter(
cfg.log_filename.replace('.txt', '') + '_' + norm)
class RelGANInstructor(BasicInstructor):
def __init__(self, opt):
super(RelGANInstructor, self).__init__(opt)
# generator, discriminator
self.gen = RelGAN_G(cfg.mem_slots, cfg.num_heads, cfg.head_size, cfg.gen_embed_dim, cfg.gen_hidden_dim,
cfg.vocab_size, cfg.max_seq_len, cfg.padding_idx, gpu=cfg.CUDA)
self.dis = RelGAN_D(cfg.dis_embed_dim, cfg.max_seq_len, cfg.num_rep, cfg.vocab_size, cfg.padding_idx,
gpu=cfg.CUDA)
self.init_model()
# Optimizer
self.gen_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_lr)
self.gen_adv_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_adv_lr)
self.dis_opt = optim.Adam(self.dis.parameters(), lr=cfg.dis_lr)
# Criterion
self.mle_criterion = nn.NLLLoss()
# DataLoader
self.gen_data = GenDataIter(self.gen.sample(cfg.batch_size, cfg.batch_size))
def _run(self):
# =====PRE-TRAINING (GENERATOR)=====
if not cfg.gen_pretrain:
self.log.info('Starting Generator MLE Training...')
self.pretrain_generator(cfg.MLE_train_epoch)
if cfg.if_save and not cfg.if_test:
torch.save(self.gen.state_dict(), cfg.pretrained_gen_path)
print('Save pre-trained generator: {}'.format(cfg.pretrained_gen_path))
self.log.info('Initial generator: %s' % (self.cal_metrics(fmt_str=True)))
# # =====ADVERSARIAL TRAINING=====
self.log.info('Starting Adversarial Training...')
progress = tqdm(range(cfg.ADV_train_epoch))
for adv_epoch in progress:
self.sig.update()
if self.sig.adv_sig:
g_loss = self.adv_train_generator(cfg.ADV_g_step) # Generator
d_loss = self.adv_train_discriminator(cfg.ADV_d_step) # Discriminator
self.update_temperature(adv_epoch, cfg.ADV_train_epoch) # update temperature
progress.set_description(
'g_loss: %.4f, d_loss: %.4f, temperature: %.4f' % (g_loss, d_loss, self.gen.temperature))
# TEST
if adv_epoch % cfg.adv_log_step == 0:
self.log.info('[ADV] epoch %d: g_loss: %.4f, d_loss: %.4f, %s' % (
adv_epoch, g_loss, d_loss, self.cal_metrics(fmt_str=True)))
if cfg.if_save and not cfg.if_test:
self._save('ADV', adv_epoch)
else:
self.log.info('>>> Stop by adv_signal! Finishing adversarial training...')
progress.close()
break
def _test(self):
print('>>> Begin test...')
self._run()
pass
def pretrain_generator(self, epochs):
"""
Max Likelihood Pre-training for the generator
"""
for epoch in range(epochs):
self.sig.update()
if self.sig.pre_sig:
# =====Train=====
pre_loss = self.train_gen_epoch(self.gen, self.oracle_data.loader, self.mle_criterion, self.gen_opt)
# =====Test=====
if epoch % cfg.pre_log_step == 0:
self.log.info(
'[MLE-GEN] epoch %d : pre_loss = %.4f, %s' % (epoch, pre_loss, self.cal_metrics(fmt_str=True)))
if cfg.if_save and not cfg.if_test:
self._save('MLE', epoch)
else:
self.log.info('>>> Stop by pre signal, skip to adversarial training...')
break
if cfg.if_save and not cfg.if_test:
self._save('MLE', epoch)
def adv_train_generator(self, g_step):
total_loss = 0
for step in range(g_step):
real_samples = F.one_hot(self.oracle_data.random_batch()['target'], cfg.vocab_size).float()
gen_samples = self.gen.sample(cfg.batch_size, cfg.batch_size, one_hot=True)
if cfg.CUDA:
real_samples, gen_samples = real_samples.cuda(), gen_samples.cuda()
# =====Train=====
d_out_real = self.dis(real_samples)
d_out_fake = self.dis(gen_samples)
g_loss, _ = get_losses(d_out_real, d_out_fake, cfg.loss_type)
self.optimize(self.gen_adv_opt, g_loss, self.gen)
total_loss += g_loss.item()
return total_loss / g_step if g_step != 0 else 0
def adv_train_discriminator(self, d_step):
total_loss = 0
for step in range(d_step):
real_samples = F.one_hot(self.oracle_data.random_batch()['target'], cfg.vocab_size).float()
gen_samples = self.gen.sample(cfg.batch_size, cfg.batch_size, one_hot=True)
if cfg.CUDA:
real_samples, gen_samples = real_samples.cuda(), gen_samples.cuda()
# =====Train=====
d_out_real = self.dis(real_samples)
d_out_fake = self.dis(gen_samples)
_, d_loss = get_losses(d_out_real, d_out_fake, cfg.loss_type)
self.optimize(self.dis_opt, d_loss, self.dis)
total_loss += d_loss.item()
return total_loss / d_step if d_step != 0 else 0
def update_temperature(self, i, N):
self.gen.temperature = get_fixed_temperature(cfg.temperature, i, N, cfg.temp_adpt)
@staticmethod
def optimize(opt, loss, model=None, retain_graph=False):
"""Add clip_grad_norm_"""
opt.zero_grad()
loss.backward(retain_graph=retain_graph)
if model is not None:
torch.nn.utils.clip_grad_norm_(model.parameters(), cfg.clip_norm)
opt.step()
class TRGANInstructor(BasicInstructor):
def __init__(self, opt):
super(TRGANInstructor, self).__init__(opt)
# generator, discriminator
self.gen = RelGAN_G(cfg.mem_slots, cfg.num_heads, cfg.head_size, cfg.gen_embed_dim, cfg.gen_hidden_dim,
cfg.vocab_size, cfg.max_seq_len, cfg.padding_idx, gpu=cfg.CUDA)
self.dis = RelGAN_D(cfg.dis_embed_dim, cfg.max_seq_len, cfg.num_rep, cfg.vocab_size, cfg.padding_idx,
gpu=cfg.CUDA)
self.dis_D = RelGAN_D(cfg.dis_embed_dim, cfg.max_seq_len, cfg.num_rep, cfg.vocab_size, cfg.padding_idx,
gpu=cfg.CUDA)
self.init_model()
# Optimizer
self.gen_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_lr)
self.gen_adv_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_adv_lr)
self.dis_opt = optim.Adam(self.dis.parameters(), lr=cfg.dis_lr)
self.dis_D_opt = optim.Adam(self.dis_D.parameters(), lr=cfg.dis_D_lr)
def init_model(self):
if cfg.oracle_pretrain:
if not os.path.exists(cfg.oracle_state_dict_path):
create_oracle()
self.oracle.load_state_dict(torch.load(cfg.oracle_state_dict_path))
if cfg.dis_pretrain:
self.log.info(
'Load pretrained discriminator: {}'.format(cfg.pretrained_dis_path))
self.dis.load_state_dict(torch.load(cfg.pretrained_dis_path))
if cfg.gen_pretrain:
self.log.info('Load MLE pretrained generator gen: {}'.format(cfg.pretrained_gen_path))
self.gen.load_state_dict(torch.load(cfg.pretrained_gen_path, map_location='cuda:{}'.format(cfg.device)))
if cfg.CUDA:
self.oracle = self.oracle.cuda()
self.gen = self.gen.cuda()
self.dis = self.dis.cuda()
self.dis_D = self.dis_D.cuda()
def _run(self):
# ===PRE-TRAINING (GENERATOR)===
if not cfg.gen_pretrain:
self.log.info('Starting Generator MLE Training...')
self.pretrain_generator(cfg.MLE_train_epoch)
if cfg.if_save and not cfg.if_test:
torch.save(self.gen.state_dict(), cfg.pretrained_gen_path)
print('Save pre-trained generator: {}'.format(cfg.pretrained_gen_path))
# # ===ADVERSARIAL TRAINING===
self.log.info('Starting Adversarial Training...')
progress = tqdm(range(cfg.ADV_train_epoch))
for adv_epoch in progress:
self.sig.update()
if self.sig.adv_sig:
g_loss = self.adv_train_generator(cfg.ADV_g_step) # Generator
d_loss = self.adv_train_discriminator(cfg.ADV_d_step) # Discriminator
self.update_temperature(adv_epoch, cfg.ADV_train_epoch) # update temperature
progress.set_description(
'g_loss: %.4f, d_loss: %.4f, temperature: %.4f' % (g_loss, d_loss, self.gen.temperature))
# TEST
if adv_epoch % cfg.adv_log_step == 0:
self.log.info('[ADV] epoch %d: g_loss: %.4f, d_loss: %.4f, %s' % (
adv_epoch, g_loss, d_loss, self.cal_metrics(fmt_str=True)))
if cfg.if_save and not cfg.if_test:
self._save('ADV', adv_epoch)
else:
self.log.info('>>> Stop by adv_signal! Finishing adversarial training...')
progress.close()
break
def _test(self):
print('>>> Begin test...')
self._run()
pass
def pretrain_generator(self, epochs):
"""
Max Likelihood Pre-training for the generator
"""
for epoch in range(epochs):
self.sig.update()
if self.sig.pre_sig:
# ===Train===
pre_loss = self.train_gen_epoch(self.gen, self.oracle_data.loader, self.mle_criterion, self.gen_opt)
# ===Test===
if epoch % cfg.pre_log_step == 0 or epoch == epochs - 1:
self.log.info(
'[MLE-GEN] epoch %d : pre_loss = %.4f, %s' % (epoch, pre_loss, self.cal_metrics(fmt_str=True)))
if cfg.if_save and not cfg.if_test:
self._save('MLE', epoch)
else:
self.log.info('>>> Stop by pre signal, skip to adversarial training...')
break
def adv_train_generator(self, g_step):
criterion = nn.BCELoss()
total_loss = 0
with torch.no_grad():
gen_samples = self.gen.sample(cfg.batch_size, cfg.batch_size, one_hot=True)
if cfg.CUDA:
gen_samples = gen_samples.cuda()
D0 = torch.sigmoid(self.dis_D(gen_samples))
P0 = (1.-D0)/torch.clamp(D0, min = 1e-7)
for step in range(g_step):
real_samples = F.one_hot(self.oracle_data.random_batch()['target'], cfg.vocab_size).float()
gen_samples = self.gen.sample(cfg.batch_size, cfg.batch_size, one_hot=True)
real_label = torch.full((D0.shape[0],), 1.)
fake_label = torch.full((D0.shape[0],), 0.)
if cfg.CUDA:
real_samples, gen_samples, real_label, fake_label = real_samples.cuda(), gen_samples.cuda(), real_label.cuda(), fake_label.cuda()
# print(self.dis_D(real_samples).shape, real_label.shape)
errDD_real = criterion(torch.sigmoid(self.dis_D(real_samples)), real_label)
errDD_fake = criterion(torch.sigmoid(self.dis_D(gen_samples.detach())), fake_label)
self.optimize(self.dis_D_opt, errDD_real+errDD_fake, self.dis_D)
gen_samples = self.gen.sample(cfg.batch_size, cfg.batch_size, one_hot=True).cuda()
real_samples = F.one_hot(self.oracle_data.random_batch()['target'], cfg.vocab_size).float().cuda()
D1 = torch.sigmoid(self.dis_D(gen_samples))
P1 = (1.-D1)
ratio = (P1/torch.clamp(D1*P0, min = 1e-7))
ratio_clipped = torch.clamp(ratio, 1.0 - cfg.clip_param, 1.0 + cfg.clip_param)
# ===Train===
d_out_real = self.dis(real_samples)
d_out_fake = self.dis(gen_samples)
surr1 = ratio * d_out_fake
surr2 = ratio_clipped * d_out_fake
target = torch.where(d_out_fake>0, torch.min(surr1, surr2), torch.max(surr1, surr2))
g_loss, _ = get_losses(d_out_real, target, cfg.loss_type)
# g_loss = -d_out_fake.mean()
self.optimize(self.gen_adv_opt, g_loss, self.gen)
total_loss += g_loss.item()
return total_loss / g_step if g_step != 0 else 0
def calc_gradient_penalty(self, real_data, fake_data):
BATCH_SIZE = real_data.shape[0]
alpha = torch.rand(BATCH_SIZE, 1)
alpha = alpha.expand(BATCH_SIZE, real_data.nelement()//BATCH_SIZE).contiguous().view(real_data.shape)
alpha = alpha.cuda()
interpolates = alpha * real_data + ((1 - alpha) * fake_data)
interpolates = interpolates.cuda()
interpolates = autograd.Variable(interpolates, requires_grad=True)
# disc_interpolates = netD(interpolates)
disc_interpolates = self.dis(interpolates)
gradients = autograd.grad(outputs=disc_interpolates, inputs=interpolates,
grad_outputs=torch.ones(disc_interpolates.size()).cuda(),
create_graph=True, retain_graph=True, only_inputs=True)[0]
gradients = gradients.contiguous().view(gradients.size(0), -1)
gradient_penalty = ((gradients.norm(2, dim=1) - 1) ** 2).mean()
return gradient_penalty
def adv_train_discriminator(self, d_step):
total_loss = 0
for step in range(d_step):
real_samples = F.one_hot(self.oracle_data.random_batch()['target'], cfg.vocab_size).float()
gen_samples = self.gen.sample(cfg.batch_size, cfg.batch_size, one_hot=True)
if cfg.CUDA:
real_samples, gen_samples = real_samples.cuda(), gen_samples.cuda()
# ===Train===
d_out_real = self.dis(real_samples)
d_out_fake = self.dis(gen_samples)
_, d_loss = get_losses(d_out_real, d_out_fake, cfg.loss_type)
if cfg.GP:
gradient_penalty = self.calc_gradient_penalty(real_samples.data, gen_samples.data)
d_loss = d_loss+cfg.LAMBDA*gradient_penalty
# print(d_loss.shape)
self.optimize(self.dis_opt, d_loss, self.dis)
total_loss += d_loss.item()
return total_loss / d_step if d_step != 0 else 0
def update_temperature(self, i, N):
self.gen.temperature = get_fixed_temperature(cfg.temperature, i, N, cfg.temp_adpt)
@staticmethod
def optimize(opt, loss, model=None, retain_graph=False):
"""Add clip_grad_norm_"""
opt.zero_grad()
loss.backward(retain_graph=retain_graph)
if model is not None:
torch.nn.utils.clip_grad_norm_(model.parameters(), cfg.clip_norm)
opt.step()
class RelGANInstructor(BasicInstructor):
def __init__(self, opt):
super(RelGANInstructor, self).__init__(opt)
norm = opt.norm
assert norm in ['none', 'spectral', 'gradnorm', 'gp']
# generator, discriminator
print('norm ', norm)
self.norm = norm
self.gen = RelGAN_G(cfg.mem_slots,
cfg.num_heads,
cfg.head_size,
cfg.gen_embed_dim,
cfg.gen_hidden_dim,
cfg.vocab_size,
cfg.max_seq_len,
cfg.padding_idx,
gpu=cfg.CUDA)
self.dis = RelGAN_D(cfg.dis_embed_dim,
cfg.max_seq_len,
cfg.num_rep,
cfg.vocab_size,
cfg.padding_idx,
gpu=cfg.CUDA,
norm=norm).cuda()
if norm == 'gradnorm':
print('use gradnorm')
self.dis = GradNorm(self.dis).cuda()
self.init_model()
# Optimizer
if norm == 'gradnorm':
self.gen_opt = optim.Adam(self.gen.parameters(),
lr=cfg.gen_lr,
betas=(0.5, 0.999))
self.gen_adv_opt = optim.Adam(self.gen.parameters(),
lr=cfg.gen_adv_lr,
betas=(0.5, 0.999))
self.dis_opt = optim.Adam(self.dis.parameters(),
lr=cfg.dis_lr,
betas=(0.5, 0.999))
else:
self.gen_opt = optim.Adam(self.gen.parameters(), lr=cfg.gen_lr)
self.gen_adv_opt = optim.Adam(self.gen.parameters(),
lr=cfg.gen_adv_lr)
self.dis_opt = optim.Adam(self.dis.parameters(), lr=cfg.dis_lr)
os.makedirs(cfg.log_filename.replace('.txt', ''), exist_ok=True)
self.logger = SummaryWriter(
cfg.log_filename.replace('.txt', '') + '_' + norm)
def _run(self):
# ===PRE-TRAINING (GENERATOR)===
if os.path.exists(cfg.pretrained_gen_path):
checkpoint = torch.load(cfg.pretrained_gen_path)
generation_weights = self.gen.state_dict()
match = True
for key, value in checkpoint.items():
if key not in generation_weights:
match = False
elif generation_weights[key].shape != checkpoint[key].shape:
match = False
if match:
self.gen.load_state_dict(checkpoint)
print('Load pre-trained generator: {}'.format(
cfg.pretrained_gen_path))
elif not cfg.gen_pretrain:
self.log.info('Starting Generator MLE Training...')
self.pretrain_generator(cfg.MLE_train_epoch)
if cfg.if_save and not cfg.if_test:
torch.save(self.gen.state_dict(), cfg.pretrained_gen_path)
print('Save pre-trained generator: {}'.format(
cfg.pretrained_gen_path))
# # ===ADVERSARIAL TRAINING===
self.log.info('Starting Adversarial Training...')
progress = tqdm(range(cfg.ADV_train_epoch), dynamic_ncols=True)
for adv_epoch in progress:
self.sig.update()
if self.sig.adv_sig:
start = time()
g_loss = self.adv_train_generator(cfg.ADV_g_step) # Generator
d_loss = self.adv_train_discriminator(
cfg.ADV_d_step) # Discriminator
self.update_temperature(
adv_epoch, cfg.ADV_train_epoch) # update temperature
progress.set_description(
'g_loss: %.4f, d_loss: %.4f, temperature: %.4f' %
(g_loss, d_loss, self.gen.temperature))
if adv_epoch % 10 == 0:
self.logger.add_scalar('train/d_loss', float(d_loss),
adv_epoch)
self.logger.add_scalar('train/g_loss', float(g_loss),
adv_epoch)
self.logger.add_scalar('train/temperature',
self.gen.temperature, adv_epoch)
# TEST
if adv_epoch % cfg.adv_log_step == 0:
metrics = self.cal_metrics(fmt_str=False)
for key, value in metrics.items():
if isinstance(value, list):
for idx, v in enumerate(value):
self.logger.add_scalar(
'train/' + key + '/' + str(idx), v,
adv_epoch)
else:
self.logger.add_scalar('train/' + key, value,
adv_epoch)
self.logger.flush()
self.log.info(
'[ADV] epoch %d: g_loss: %.4f, d_loss: %.4f' %
(adv_epoch, g_loss, d_loss))
if cfg.if_save and not cfg.if_test:
self._save('GEN', adv_epoch)
else:
self.log.info(
'>>> Stop by adv_signal! Finishing adversarial training...'
)
progress.close()
break
def _test(self):
print('>>> Begin test...')
self._run()
pass
def pretrain_generator(self, epochs):
"""
Max Likelihood Pre-training for the generator
"""
for epoch in range(epochs):
self.sig.update()
if self.sig.pre_sig:
# ===Train===
pre_loss = self.train_gen_epoch(self.gen,
self.train_data.loader,
self.mle_criterion,
self.gen_opt)
# ===Test===
if (epoch % cfg.pre_log_step == 0
or epoch == epochs - 1) and epoch > 0:
metrics = self.cal_metrics(fmt_str=False)
for key, value in metrics.items():
if isinstance(value, list):
for idx, v in enumerate(value):
self.logger.add_scalar(
'pretrain/' + key + '/' + str(idx), v,
epoch)
else:
self.logger.add_scalar('pretrain/' + key, value,
epoch)
self.logger.add_scalar('pretrain/loss', pre_loss, epoch)
self.logger.flush()
self.log.info('[MLE-GEN] epoch %d : pre_loss = %.4f' %
(epoch, pre_loss))
if cfg.if_save and not cfg.if_test:
self._save('MLE', epoch)
else:
self.log.info(
'>>> Stop by pre signal, skip to adversarial training...')
break
def adv_train_generator(self, g_step):
total_loss = 0
for step in range(g_step):
real_samples = self.train_data.random_batch()['target']
gen_samples = self.gen.sample(cfg.batch_size,
cfg.batch_size,
one_hot=True)
if cfg.CUDA:
real_samples, gen_samples = real_samples.cuda(
), gen_samples.cuda()
real_samples = F.one_hot(real_samples, cfg.vocab_size).float()
# ===Train===
d_out_real = self.dis(real_samples)
d_out_fake = self.dis(gen_samples)
g_loss, _ = get_losses(d_out_real, d_out_fake, cfg.loss_type)
self.optimize(self.gen_adv_opt, g_loss, self.gen)
total_loss += g_loss.item()
return total_loss / g_step if g_step != 0 else 0
def adv_train_discriminator(self, d_step):
total_loss = 0
for step in range(d_step):
real_samples = self.train_data.random_batch()['target']
gen_samples = self.gen.sample(cfg.batch_size,
cfg.batch_size,
one_hot=True)
if cfg.CUDA:
real_samples, gen_samples = real_samples.cuda(
), gen_samples.cuda()
real_samples = F.one_hot(real_samples, cfg.vocab_size).float()
# ===Train===
d_out_real = self.dis(real_samples)
d_out_fake = self.dis(gen_samples)
_, d_loss = get_losses(d_out_real, d_out_fake, cfg.loss_type)
if self.norm == 'gp':
gp_loss = cacl_gradient_penalty(self.dis, real_samples,
gen_samples)
d_loss += gp_loss * 10
self.optimize(self.dis_opt, d_loss, self.dis)
total_loss += d_loss.item()
return total_loss / d_step if d_step != 0 else 0
def update_temperature(self, i, N):
self.gen.temperature = get_fixed_temperature(cfg.temperature, i, N,
cfg.temp_adpt)
@staticmethod
def optimize(opt, loss, model=None, retain_graph=False):
opt.zero_grad()
loss.backward(retain_graph=retain_graph)
if model is not None:
torch.nn.utils.clip_grad_norm_(model.parameters(), cfg.clip_norm)
opt.step()
