def forward(self, episodes, updates=1, testing=False):
support_losses = []
query_losses, query_accuracies, query_precisions, query_recalls, query_f1s = [], [], [], [], []
n_episodes = len(episodes)
for episode_id, episode in enumerate(episodes):
self.initialize_output_layer(episode.n_classes)
batch_x, batch_len, batch_y = next(iter(episode.support_loader))
batch_x, batch_len, batch_y = self.vectorize(batch_x, batch_len, batch_y)
if self.proto_maml:
output_repr = self.learner(batch_x, batch_len)
init_weights, init_bias = self._initialize_with_proto_weights(output_repr, batch_y, episode.n_classes)
else:
init_weights, init_bias = 0, 0
with torch.backends.cudnn.flags(enabled=self.fomaml or testing or not isinstance(self.learner, RNNSequenceModel)), \
higher.innerloop_ctx(self.learner, self.learner_optimizer,
copy_initial_weights=False,
track_higher_grads=(not self.fomaml and not testing)) as (flearner, diffopt):
all_predictions, all_labels = [], []
self.train()
flearner.train()
flearner.zero_grad()
for i in range(updates):
output = flearner(batch_x, batch_len)
output = self.output_layer(output, init_weights, init_bias)
output = output.view(output.size()[0] * output.size()[1], -1)
batch_y = batch_y.view(-1)
loss = self.learner_loss[episode.base_task](output, batch_y)
# Update the output layer parameters
output_weight_grad, output_bias_grad = torch.autograd.grad(loss, [self.output_layer_weight, self.output_layer_bias], retain_graph=True)
self.output_layer_weight = self.output_layer_weight - self.output_lr * output_weight_grad
self.output_layer_bias = self.output_layer_bias - self.output_lr * output_bias_grad
# Update the shared parameters
diffopt.step(loss)
relevant_indices = torch.nonzero(batch_y != -1).view(-1).detach()
pred = make_prediction(output[relevant_indices].detach()).cpu()
all_predictions.extend(pred)
all_labels.extend(batch_y[relevant_indices].cpu())
support_loss = loss.item()
accuracy, precision, recall, f1_score = utils.calculate_metrics(all_predictions,
all_labels, binary=False)
logger.info('Episode {}/{}, task {} [support_set]: Loss = {:.5f}, accuracy = {:.5f}, precision = {:.5f}, '
'recall = {:.5f}, F1 score = {:.5f}'.format(episode_id + 1, n_episodes, episode.task_id,
support_loss, accuracy, precision, recall, f1_score))
query_loss = 0.0
all_predictions, all_labels = [], []
# Disable dropout
for module in flearner.modules():
if isinstance(module, nn.Dropout):
module.eval()
for n_batch, (batch_x, batch_len, batch_y) in enumerate(episode.query_loader):
batch_x, batch_len, batch_y = self.vectorize(batch_x, batch_len, batch_y)
output = flearner(batch_x, batch_len)
output = self.output_layer(output, init_weights, init_bias)
output = output.view(output.size()[0] * output.size()[1], -1)
batch_y = batch_y.view(-1)
loss = self.learner_loss[episode.base_task](output, batch_y)
if not testing:
if self.fomaml:
meta_grads = torch.autograd.grad(loss, [p for p in flearner.parameters() if p.requires_grad], retain_graph=self.proto_maml)
else:
meta_grads = torch.autograd.grad(loss, [p for p in flearner.parameters(time=0) if p.requires_grad], retain_graph=self.proto_maml)
if self.proto_maml:
proto_grads = torch.autograd.grad(loss, [p for p in self.learner.parameters() if p.requires_grad])
meta_grads = [mg + pg for (mg, pg) in zip(meta_grads, proto_grads)]
query_loss += loss.item()
relevant_indices = torch.nonzero(batch_y != -1).view(-1).detach()
pred = make_prediction(output[relevant_indices].detach()).cpu()
all_predictions.extend(pred)
all_labels.extend(batch_y[relevant_indices].cpu())
query_loss /= n_batch + 1
accuracy, precision, recall, f1_score = utils.calculate_metrics(all_predictions,
all_labels, binary=False)
logger.info('Episode {}/{}, task {} [query set]: Loss = {:.5f}, accuracy = {:.5f}, precision = {:.5f}, '
'recall = {:.5f}, F1 score = {:.5f}'.format(episode_id + 1, n_episodes, episode.task_id,
query_loss, accuracy, precision, recall, f1_score))
support_losses.append(support_loss)
query_losses.append(query_loss)
query_accuracies.append(accuracy)
query_precisions.append(precision)
query_recalls.append(recall)
query_f1s.append(f1_score)
if not testing:
for param, meta_grad in zip([p for p in self.learner.parameters() if p.requires_grad], meta_grads):
if param.grad is not None:
param.grad += meta_grad.detach()
else:
param.grad = meta_grad.detach()
# Average the accumulated gradients
if not testing:
for param in self.learner.parameters():
if param.requires_grad:
param.grad /= len(query_accuracies)
if testing:
return support_losses, query_accuracies, query_precisions, query_recalls, query_f1s
else:
return query_losses, query_accuracies, query_precisions, query_recalls, query_f1s
def forward(self, episodes, updates=1, testing=False):
query_losses, query_accuracies, query_precisions, query_recalls, query_f1s = [], [], [], [], []
n_episodes = len(episodes)
for episode_id, episode in enumerate(episodes):
batch_x, batch_len, batch_y = next(iter(episode.support_loader))
batch_x, batch_len, batch_y = self.vectorize(batch_x, batch_len, batch_y)
self.train()
support_repr, support_label = [], []
batch_x_repr = self.learner(batch_x, batch_len)
support_repr.append(batch_x_repr)
support_label.append(batch_y)
prototypes = self._build_prototypes(support_repr, support_label, episode.n_classes)
# Run on query
query_loss = 0.0
all_predictions, all_labels = [], []
for module in self.learner.modules():
if isinstance(module, nn.Dropout):
module.eval()
for n_batch, (batch_x, batch_len, batch_y) in enumerate(episode.query_loader):
batch_x, batch_len, batch_y = self.vectorize(batch_x, batch_len, batch_y)
batch_x_repr = self.learner(batch_x, batch_len)
output = self._normalized_distances(prototypes, batch_x_repr)
output = output.view(output.size()[0] * output.size()[1], -1)
batch_y = batch_y.view(-1)
loss = self.loss_fn[episode.base_task](output, batch_y)
query_loss += loss.item()
if not testing:
self.optimizer.zero_grad()
loss.backward(retain_graph=True)
self.optimizer.step()
self.lr_scheduler.step()
relevant_indices = torch.nonzero(batch_y != -1).view(-1).detach()
all_predictions.extend(make_prediction(output[relevant_indices]).cpu())
all_labels.extend(batch_y[relevant_indices].cpu())
query_loss /= n_batch + 1
# Calculate metrics
accuracy, precision, recall, f1_score = utils.calculate_metrics(all_predictions,
all_labels, binary=False)
logger.info('Episode {}/{}, task {} [query set]: Loss = {:.5f}, accuracy = {:.5f}, precision = {:.5f}, '
'recall = {:.5f}, F1 score = {:.5f}'.format(episode_id + 1, n_episodes, episode.task_id,
query_loss, accuracy, precision, recall, f1_score))
query_losses.append(query_loss)
query_accuracies.append(accuracy)
query_precisions.append(precision)
query_recalls.append(recall)
query_f1s.append(f1_score)
return query_losses, query_accuracies, query_precisions, query_recalls, query_f1s
def forward(self, episodes, updates=1, testing=False):
support_losses = []
query_losses, query_accuracies, query_precisions, query_recalls, query_f1s = [], [], [], [], []
n_episodes = len(episodes)
for episode_id, episode in enumerate(episodes):
self.initialize_output_layer(episode.n_classes)
params = [p for p in self.parameters() if p.requires_grad] + \
[p for p in self.output_layer.parameters() if p.requires_grad]
optimizer = optim.Adam(params,
lr=self.learner_lr,
weight_decay=self.weight_decay)
batch_x, batch_len, batch_y = next(iter(episode.support_loader))
batch_x, batch_len, batch_y = self.vectorize(
batch_x, batch_len, batch_y)
self.train()
all_predictions, all_labels = [], []
output = self.learner(batch_x, batch_len)
output = self.output_layer(output)
output = output.view(output.size()[0] * output.size()[1], -1)
batch_y = batch_y.view(-1)
loss = self.learner_loss[episode.base_task](output, batch_y)
optimizer.zero_grad()
loss.backward()
optimizer.step()
relevant_indices = torch.nonzero(batch_y != -1).view(-1).detach()
pred = make_prediction(output[relevant_indices].detach()).cpu()
all_predictions.extend(pred)
all_labels.extend(batch_y[relevant_indices].cpu())
support_loss = loss.item()
accuracy, precision, recall, f1_score = utils.calculate_metrics(
all_predictions, all_labels, binary=False)
logger.info(
'Episode {}/{}, task {} [support_set]: Loss = {:.5f}, accuracy = {:.5f}, precision = {:.5f}, '
'recall = {:.5f}, F1 score = {:.5f}'.format(
episode_id + 1, n_episodes, episode.task_id, support_loss,
accuracy, precision, recall, f1_score))
query_loss = 0.0
all_predictions, all_labels = [], []
if testing:
self.eval()
for n_batch, (batch_x, batch_len,
batch_y) in enumerate(episode.query_loader):
batch_x, batch_len, batch_y = self.vectorize(
batch_x, batch_len, batch_y)
output = self.learner(batch_x, batch_len)
output = self.output_layer(output)
output = output.view(output.size()[0] * output.size()[1], -1)
batch_y = batch_y.view(-1)
loss = self.learner_loss[episode.base_task](output, batch_y)
if not testing:
optimizer.zero_grad()
loss.backward()
optimizer.step()
query_loss += loss.item()
relevant_indices = torch.nonzero(
batch_y != -1).view(-1).detach()
pred = make_prediction(output[relevant_indices].detach()).cpu()
all_predictions.extend(pred)
all_labels.extend(batch_y[relevant_indices].cpu())
query_loss /= n_batch + 1
accuracy, precision, recall, f1_score = utils.calculate_metrics(
all_predictions, all_labels, binary=False)
logger.info(
'Episode {}/{}, task {} [query set]: Loss = {:.5f}, accuracy = {:.5f}, precision = {:.5f}, '
'recall = {:.5f}, F1 score = {:.5f}'.format(
episode_id + 1, n_episodes, episode.task_id, query_loss,
accuracy, precision, recall, f1_score))
support_losses.append(support_loss)
query_losses.append(query_loss)
query_accuracies.append(accuracy)
query_precisions.append(precision)
query_recalls.append(recall)
query_f1s.append(f1_score)
if testing:
return support_losses, query_accuracies, query_precisions, query_recalls, query_f1s
else:
return query_losses, query_accuracies, query_precisions, query_recalls, query_f1s