我们从Python开源项目中，提取了以下12个代码示例，用于说明如何使用model.init_hidden()。
def evaluate(data_source): # Turn on evaluation mode which disables dropout. model.eval() total_loss = 0 ntokens = len(corpus.dictionary) hidden = model.init_hidden(eval_batch_size) for i in range(0, data_source.size(0) - 1, args.bptt): data, targets = get_batch(data_source, i, evaluation=True) output, hidden = model(data, hidden) output_flat = output.view(-1, ntokens) total_loss += len(data) * criterion(output_flat, targets).data hidden = repackage_hidden(hidden) return total_loss[0] / len(data_source)
def train(): # Turn on training mode which enables dropout. model.train() total_loss = 0 start_time = time.time() ntokens = len(corpus.dictionary) hidden = model.init_hidden(args.batch_size) for batch, i in enumerate(range(0, train_data.size(0) - 1, args.bptt)): data, targets = get_batch(train_data, i) # 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. hidden = repackage_hidden(hidden) model.zero_grad() output, hidden = model(data, hidden) loss = criterion(output.view(-1, ntokens), targets) loss.backward() # `clip_grad_norm` helps prevent the exploding gradient problem in RNNs / LSTMs. torch.nn.utils.clip_grad_norm(model.parameters(), args.clip) for p in model.parameters(): p.data.add_(-lr, p.grad.data) total_loss += loss.data if batch % args.log_interval == 0 and batch > 0: cur_loss = total_loss[0] / args.log_interval elapsed = time.time() - start_time print('| epoch {:3d} | {:5d}/{:5d} batches | lr {:02.2f} | ms/batch {:5.2f} | ' 'loss {:5.2f} | ppl {:8.2f}'.format( epoch, batch, len(train_data) // args.bptt, lr, elapsed * 1000 / args.log_interval, cur_loss, math.exp(cur_loss))) total_loss = 0 start_time = time.time() # Loop over epochs.
def evaluate(data_source): total_loss = 0 ntokens = len(corpus.dictionary) hidden = model.init_hidden(eval_batch_size) for i in range(0, data_source.size(0) - 1, args.bptt): data, targets = get_batch(data_source, i, evaluation=True) output, hidden = model(data, hidden) output_flat = output.view(-1, ntokens) total_loss += len(data) * criterion(output_flat, targets).data hidden = repackage_hidden(hidden) return total_loss[0] / len(data_source)
def train(): total_loss = 0 start_time = time.time() ntokens = len(corpus.dictionary) hidden = model.init_hidden(args.batch_size) for batch, i in enumerate(range(0, train_data.size(0) - 1, args.bptt)): data, targets = get_batch(train_data, i) hidden = repackage_hidden(hidden) model.zero_grad() output, hidden = model(data, hidden) loss = criterion(output.view(-1, ntokens), targets) loss.backward() clipped_lr = lr * clip_gradient(model, args.clip) for p in model.parameters(): p.data.add_(-clipped_lr, p.grad.data) total_loss += loss.data if batch % args.log_interval == 0 and batch > 0: cur_loss = total_loss[0] / args.log_interval elapsed = time.time() - start_time print('| epoch {:3d} | {:5d}/{:5d} batches | lr {:02.2f} | ms/batch {:5.2f} | ' 'loss {:5.2f} | ppl {:8.2f}'.format( epoch, batch, len(train_data) // args.bptt, lr, elapsed * 1000 / args.log_interval, cur_loss, math.exp(cur_loss))) total_loss = 0 start_time = time.time() # Loop over epochs.
def evaluate(data_source, batch_size=10): # Turn on evaluation mode which disables dropout. if args.model == 'QRNN': model.reset() model.eval() total_loss = 0 ntokens = len(corpus.dictionary) hidden = model.init_hidden(batch_size) for i in range(0, data_source.size(0) - 1, args.bptt): data, targets = get_batch(data_source, i, args, evaluation=True) output, hidden = model(data, hidden) output_flat = output.view(-1, ntokens) total_loss += len(data) * criterion(output_flat, targets).data hidden = repackage_hidden(hidden) return total_loss[0] / len(data_source)
def evaluate(data_source, batch_size=10): # Turn on evaluation mode which disables dropout. model.eval() if args.model == 'QRNN': model.reset() total_loss = 0 ntokens = len(corpus.dictionary) hidden = model.init_hidden(batch_size) for i in range(0, data_source.size(0) - 1, args.bptt): data, targets = get_batch(data_source, i, args, evaluation=True) output, hidden = model(data, hidden) output_flat = output.view(-1, ntokens) total_loss += len(data) * criterion(output_flat, targets).data hidden = repackage_hidden(hidden) return total_loss[0] / len(data_source)
def train(): # Turn on training mode which enables dropout. if args.model == 'QRNN': model.reset() total_loss = 0 start_time = time.time() ntokens = len(corpus.dictionary) hidden = model.init_hidden(args.batch_size) batch, i = 0, 0 while i < train_data.size(0) - 1 - 1: bptt = args.bptt if np.random.random() < 0.95 else args.bptt / 2. # Prevent excessively small or negative sequence lengths seq_len = max(5, int(np.random.normal(bptt, 5))) # There's a very small chance that it could select a very long sequence length resulting in OOM seq_len = min(seq_len, args.bptt + 10) lr2 = optimizer.param_groups[0]['lr'] optimizer.param_groups[0]['lr'] = lr2 * seq_len / args.bptt model.train() data, targets = get_batch(train_data, i, args, seq_len=seq_len) # 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. hidden = repackage_hidden(hidden) optimizer.zero_grad() output, hidden, rnn_hs, dropped_rnn_hs = model(data, hidden, return_h=True) raw_loss = criterion(output.view(-1, ntokens), targets) loss = raw_loss # Activiation Regularization loss = loss + sum(args.alpha * dropped_rnn_h.pow(2).mean() for dropped_rnn_h in dropped_rnn_hs[-1:]) # Temporal Activation Regularization (slowness) loss = loss + sum(args.beta * (rnn_h[1:] - rnn_h[:-1]).pow(2).mean() for rnn_h in rnn_hs[-1:]) 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 += raw_loss.data optimizer.param_groups[0]['lr'] = lr2 if batch % args.log_interval == 0 and batch > 0: cur_loss = total_loss[0] / args.log_interval elapsed = time.time() - start_time print('| epoch {:3d} | {:5d}/{:5d} batches | lr {:02.2f} | ms/batch {:5.2f} | ' 'loss {:5.2f} | ppl {:8.2f}'.format( epoch, batch, len(train_data) // args.bptt, optimizer.param_groups[0]['lr'], elapsed * 1000 / args.log_interval, cur_loss, math.exp(cur_loss))) total_loss = 0 start_time = time.time() ### batch += 1 i += seq_len # Load the best saved model.
def train(): # Turn on training mode which enables dropout. if args.model == 'QRNN': model.reset() total_loss = 0 start_time = time.time() ntokens = len(corpus.dictionary) hidden = model.init_hidden(args.batch_size) batch, i = 0, 0 while i < train_data.size(0) - 1 - 1: bptt = args.bptt if np.random.random() < 0.95 else args.bptt / 2. # Prevent excessively small or negative sequence lengths seq_len = max(5, int(np.random.normal(bptt, 5))) # There's a very small chance that it could select a very long sequence length resulting in OOM # seq_len = min(seq_len, args.bptt + 10) lr2 = optimizer.param_groups[0]['lr'] optimizer.param_groups[0]['lr'] = lr2 * seq_len / args.bptt model.train() data, targets = get_batch(train_data, i, args, seq_len=seq_len) # 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. hidden = repackage_hidden(hidden) optimizer.zero_grad() output, hidden, rnn_hs, dropped_rnn_hs = model(data, hidden, return_h=True) raw_loss = criterion(output.view(-1, ntokens), targets) loss = raw_loss # Activiation Regularization loss = loss + sum(args.alpha * dropped_rnn_h.pow(2).mean() for dropped_rnn_h in dropped_rnn_hs[-1:]) # Temporal Activation Regularization (slowness) loss = loss + sum(args.beta * (rnn_h[1:] - rnn_h[:-1]).pow(2).mean() for rnn_h in rnn_hs[-1:]) 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 += raw_loss.data optimizer.param_groups[0]['lr'] = lr2 if batch % args.log_interval == 0 and batch > 0: cur_loss = total_loss[0] / args.log_interval elapsed = time.time() - start_time print('| epoch {:3d} | {:5d}/{:5d} batches | lr {:02.2f} | ms/batch {:5.2f} | ' 'loss {:5.2f} | ppl {:8.2f}'.format( epoch, batch, len(train_data) // args.bptt, optimizer.param_groups[0]['lr'], elapsed * 1000 / args.log_interval, cur_loss, math.exp(cur_loss))) total_loss = 0 start_time = time.time() ### batch += 1 i += seq_len # Loop over epochs.
def evaluate(data_source, batch_size=10, window=args.window): # Turn on evaluation mode which disables dropout. if args.model == 'QRNN': model.reset() model.eval() total_loss = 0 ntokens = len(corpus.dictionary) hidden = model.init_hidden(batch_size) next_word_history = None pointer_history = None for i in range(0, data_source.size(0) - 1, args.bptt): if i > 0: print(i, len(data_source), math.exp(total_loss / i)) data, targets = get_batch(data_source, i, evaluation=True, args=args) output, hidden, rnn_outs, _ = model(data, hidden, return_h=True) rnn_out = rnn_outs[-1].squeeze() output_flat = output.view(-1, ntokens) ### # Fill pointer history start_idx = len(next_word_history) if next_word_history is not None else 0 next_word_history = torch.cat([one_hot(t.data[0], ntokens) for t in targets]) if next_word_history is None else torch.cat([next_word_history, torch.cat([one_hot(t.data[0], ntokens) for t in targets])]) #print(next_word_history) pointer_history = Variable(rnn_out.data) if pointer_history is None else torch.cat([pointer_history, Variable(rnn_out.data)], dim=0) #print(pointer_history) ### # Built-in cross entropy # total_loss += len(data) * criterion(output_flat, targets).data[0] ### # Manual cross entropy # softmax_output_flat = torch.nn.functional.softmax(output_flat) # soft = torch.gather(softmax_output_flat, dim=1, index=targets.view(-1, 1)) # entropy = -torch.log(soft) # total_loss += len(data) * entropy.mean().data[0] ### # Pointer manual cross entropy loss = 0 softmax_output_flat = torch.nn.functional.softmax(output_flat) for idx, vocab_loss in enumerate(softmax_output_flat): p = vocab_loss if start_idx + idx > window: valid_next_word = next_word_history[start_idx + idx - window:start_idx + idx] valid_pointer_history = pointer_history[start_idx + idx - window:start_idx + idx] logits = torch.mv(valid_pointer_history, rnn_out[idx]) theta = args.theta ptr_attn = torch.nn.functional.softmax(theta * logits).view(-1, 1) ptr_dist = (ptr_attn.expand_as(valid_next_word) * valid_next_word).sum(0).squeeze() lambdah = args.lambdasm p = lambdah * ptr_dist + (1 - lambdah) * vocab_loss ### target_loss = p[targets[idx].data] loss += (-torch.log(target_loss)).data[0] total_loss += loss / batch_size ### hidden = repackage_hidden(hidden) next_word_history = next_word_history[-window:] pointer_history = pointer_history[-window:] return total_loss / len(data_source) # Load the best saved model.
