def dis_pre_train_step():
discriminator.train()
lab_batch = next(labeled_train_loader)
lab_token_seqs = lab_batch.content[0]
lab_seq_lengths = np.array([len(seq) for seq in lab_token_seqs])
labels = lab_batch.label
lab_token_seqs = torch.from_numpy(np.transpose(lab_token_seqs.numpy()))
labels = torch.from_numpy(np.transpose(labels.numpy()))
num_lab_sample = lab_token_seqs.shape[1]
lab_hidden = discriminator.init_hidden(num_lab_sample)
lab_output = discriminator(lab_token_seqs, lab_hidden, lab_seq_lengths)
lab_element_loss = criterion(lab_output, labels)
lab_loss = torch.mean(lab_element_loss)
# Before the backward pass, use the optimizer object to zero all of the
# gradients for the variables it will update (which are the learnable
# weights of the model). This is because by default, gradients are
# accumulated in buffers( i.e, not overwritten) whenever .backward()
# is called.
dis_optimizer.zero_grad()
lab_loss.backward()
# `clip_grad_norm` helps prevent the exploding gradient problem in RNNs / LSTMs.
torch.nn.utils.clip_grad_norm_(discriminator.parameters(), args.clip)
dis_optimizer.step()
return lab_loss
def evaluate(test=False):
# Turn on evaluate mode which disables dropout.
correct = 0
total = 0
discriminator.eval()
current_loader = valid_loader
current_length = valid_length
if test:
current_loader = test_loader
current_length = test_length
with torch.no_grad():
for i_batch in range(current_length):
sample_batched = next(current_loader)
token_seqs = sample_batched.content[0]
seq_lengths = np.array([len(seq) for seq in token_seqs])
labels = sample_batched.label
token_seqs = torch.from_numpy(np.transpose(
token_seqs.numpy())).cuda(env_settings.CUDA_DEVICE)
labels = torch.from_numpy(np.transpose(labels.numpy())).cuda(
env_settings.CUDA_DEVICE)
hidden = discriminator.init_hidden(token_seqs.shape[1])
output = discriminator(token_seqs, hidden, seq_lengths)
_, predict_class = torch.max(output, 1)
total += labels.size(0)
correct += (predict_class == labels).sum().item()
for i_metric in range(list(predict_class.size())[0]):
metrics_handler.metricsHandler.update(
(predict_class.data)[i_metric].item(),
(labels.data)[i_metric].item())
test_acc = 100 * correct / total
print(
'Accuracy of the classifier on the test data is : {:5.4f}'.format(
test_acc))
if test:
output_handler.outputFileHandler.write(
f'Test Acc: {test_acc:.2f}%\n')
output_handler.outputFileHandler.write(
f'Test recall: {metrics_handler.metricsHandler.getRecall():.3f}%\n'
)
output_handler.outputFileHandler.write(
f'Test precision: {metrics_handler.metricsHandler.getPrecision():.3f}%\n'
)
else:
output_handler.outputFileHandler.write(
f'Valid Acc: {test_acc:.2f}%\n')
output_handler.outputFileHandler.write(
f'Valid recall: {metrics_handler.metricsHandler.getRecall():.3f}%\n'
)
output_handler.outputFileHandler.write(
f'Valid precision: {metrics_handler.metricsHandler.getPrecision():.3f}%\n'
)
return correct / total
def train():
# Turn on training mode which enables dropout.
model.train()
total_loss = 0.
start_time = time.time()
for i_batch, sample_batched in enumerate(train_loader):
# the sample batched has the following information
# {token_seqs, next_token_seqs, importance_seqs, labels, seq_lengths, pad_length}
# Starting each batch, we detach the hidden state from how it was previously produced.
# If we didn't, the model would try backpropagating all the way to start of the dataset.
token_seqs = torch.from_numpy(np.transpose(
sample_batched[0])).to(device)
labels = torch.from_numpy(np.transpose(sample_batched[3])).to(device)
seq_lengths = np.transpose(sample_batched[4])
hidden = model.init_hidden(token_seqs.shape[1])
output = model(token_seqs, hidden, seq_lengths)
element_loss = criterion(output, labels)
loss = torch.mean(element_loss)
# Before the backward pass, use the optimizer object to zero all of the
# gradients for the variables it will update (which are the learnable
# weights of the model). This is because by default, gradients are
# accumulated in buffers( i.e, not overwritten) whenever .backward()
# is called.
optimizer.zero_grad()
loss.backward()
# `clip_grad_norm` helps prevent the exploding gradient problem in RNNs / LSTMs.
torch.nn.utils.clip_grad_norm_(model.parameters(), args.clip)
optimizer.step()
total_loss += loss.item()
if i_batch % args.log_interval == 0 and i_batch > 0:
cur_loss = total_loss / args.log_interval
elapsed = time.time() - start_time
print('| epoch {:3d} | {:5d}/{:5d} batches | ms/batch {:5.2f} | '
'loss {:5.4f} | ppl {:8.2f}'.format(
epoch, i_batch,
len(train_data) // args.batch_size,
elapsed * 1000 / args.log_interval, cur_loss,
math.exp(cur_loss)))
total_loss = 0
start_time = time.time()
def evaluate():
# Turn on evaluate mode which disables dropout.
correct = 0
total = 0
model.eval()
with torch.no_grad():
for i_batch, sample_batched in enumerate(test_loader):
token_seqs = torch.from_numpy(np.transpose(
sample_batched[0])).to(device)
labels = torch.from_numpy(np.transpose(
sample_batched[3])).to(device)
seq_lengths = np.transpose(sample_batched[4])
hidden = model.init_hidden(token_seqs.shape[1])
output = model(token_seqs, hidden, seq_lengths)
_, predict_class = torch.max(output, 1)
total += labels.size(0)
correct += (predict_class == labels).sum().item()
print(
'Accuracy of the classifier on the test data is : {:5.4f}'.format(
100 * correct / total))
return correct / total
def adv_train_step(judge_only=True):
discriminator.train()
judger.train()
# {token_seqs, next_token_seqs, importance_seqs, labels, seq_lengths, pad_length}
# Sample m labeled instances from DL
lab_batch = next(labeled_train_loader)
lab_token_seqs = lab_batch.content[0]
lab_seq_lengths = np.array([len(seq) for seq in lab_token_seqs])
labels = lab_batch.label
lab_token_seqs = torch.from_numpy(np.transpose(lab_token_seqs.numpy()))
labels = torch.from_numpy(np.transpose(labels.numpy()))
num_lab_sample = lab_token_seqs.shape[1]
# Sample m labeled instances from DU and predict their corresponding label
unl_batch = next(unlabeled_train_loader)
unl_token_seqs = unl_batch.content[0]
unl_seq_lengths = [len(seq) for seq in unl_token_seqs]
unl_token_seqs = torch.from_numpy(np.transpose(unl_token_seqs.numpy()))
num_unl_sample = unl_token_seqs.shape[1]
unl_hidden = discriminator.init_hidden(num_unl_sample)
unl_output = discriminator(unl_token_seqs, unl_hidden, unl_seq_lengths)
_, fake_labels = torch.max(unl_output, 1)
if judge_only:
k = 1
else:
k = 3
for _k in range(k):
# Update the judge model
###############################################################################
lab_judge_hidden = judger.init_hidden(num_lab_sample)
one_hot_label = one_hot_embedding(labels,
args.nclass) # one hot encoder
lab_judge_prob = judger(lab_token_seqs, lab_judge_hidden,
lab_seq_lengths, one_hot_label)
lab_labeled = torch.ones(num_lab_sample)
unl_judge_hidden = judger.init_hidden(num_unl_sample)
one_hot_unl = one_hot_embedding(fake_labels,
args.nclass) # one hot encoder
unl_judge_prob = judger(unl_token_seqs, unl_judge_hidden,
unl_seq_lengths, one_hot_unl)
unl_labeled = torch.zeros(num_unl_sample)
if_labeled = torch.cat((lab_labeled, unl_labeled))
all_judge_prob = torch.cat((lab_judge_prob, unl_judge_prob))
all_judge_prob = all_judge_prob.view(-1)
judge_loss = criterion_judge(all_judge_prob, if_labeled)
judge_optimizer.zero_grad()
judge_loss.backward()
# `clip_grad_norm` helps prevent the exploding gradient problem in RNNs / LSTMs.
torch.nn.utils.clip_grad_norm_(judger.parameters(), args.clip)
judge_optimizer.step()
unl_loss_value = 0.0
lab_loss_value = 0.0
fake_labels = repackage_hidden(fake_labels)
unl_judge_prob = repackage_hidden(unl_judge_prob)
if not judge_only:
# Update the predictor
###############################################################################
lab_hidden = discriminator.init_hidden(num_lab_sample)
lab_output = discriminator(lab_token_seqs, lab_hidden,
lab_seq_lengths)
lab_element_loss = criterion(lab_output, labels)
lab_loss = torch.mean(lab_element_loss)
# calculate loss for unlabeled instances
unl_hidden = discriminator.init_hidden(num_unl_sample)
unl_output = discriminator(unl_token_seqs, unl_hidden,
unl_seq_lengths)
unl_element_loss = criterion(unl_output, fake_labels)
unl_loss = unl_element_loss.dot(
unl_judge_prob.view(-1)) / num_unl_sample
# do not include this in version 1
if _k < int(k / 2):
lab_unl_loss = lab_loss + unl_loss
else:
lab_unl_loss = unl_loss
dis_optimizer.zero_grad()
lab_unl_loss.backward()
# `clip_grad_norm` helps prevent the exploding gradient problem in RNNs / LSTMs.
torch.nn.utils.clip_grad_norm_(discriminator.parameters(),
args.clip)
dis_optimizer.step()
unl_loss_value = unl_loss.item()
lab_loss_value = lab_loss.item()
return judge_loss, unl_loss_value, lab_loss_value
