def forward(self, q, k, v, lengths, speaker_embed, start_index,
force_monotonic=False, prev_coeffs=None, window=None):
# add position encoding as an inductive bias
if self.has_bias: # multi-speaker model
omega_q = 2 * F.sigmoid(
F.squeeze(self.q_pos_affine(speaker_embed), axes=[-1]))
omega_k = 2 * self.omega_initial * F.sigmoid(F.squeeze(
self.k_pos_affine(speaker_embed), axes=[-1]))
else: # single-speaker case
batch_size = q.shape[0]
omega_q = F.ones((batch_size, ), dtype="float32")
omega_k = F.ones((batch_size, ), dtype="float32") * self.omega_default
q += self.position_encoding_weight * positional_encoding(q, start_index, omega_q)
k += self.position_encoding_weight * positional_encoding(k, 0, omega_k)
q, k, v = self.q_affine(q), self.k_affine(k), self.v_affine(v)
activations = F.matmul(q, k, transpose_y=True)
activations /= np.sqrt(self.attention_dim)
if self.training:
# mask the <pad> parts from the encoder
mask = F.sequence_mask(lengths, dtype="float32")
attn_bias = F.scale(1. - mask, -1000)
activations += F.unsqueeze(attn_bias, [1])
elif force_monotonic:
assert window is not None
backward_step, forward_step = window
T_enc = k.shape[1]
batch_size, T_dec, _ = q.shape
# actually T_dec = 1 here
alpha = F.fill_constant((batch_size, T_dec), value=0, dtype="int64") \
if prev_coeffs is None \
else F.argmax(prev_coeffs, axis=-1)
backward = F.sequence_mask(alpha - backward_step, maxlen=T_enc, dtype="bool")
forward = F.sequence_mask(alpha + forward_step, maxlen=T_enc, dtype="bool")
mask = F.cast(F.logical_xor(backward, forward), "float32")
# print("mask's shape:", mask.shape)
attn_bias = F.scale(1. - mask, -1000)
activations += attn_bias
# softmax
coefficients = F.softmax(activations, axis=-1)
# context vector
coefficients = F.dropout(coefficients, 1. - self.keep_prob,
dropout_implementation='upscale_in_train')
contexts = F.matmul(coefficients, v)
# context normalization
enc_lengths = F.cast(F.unsqueeze(lengths, axes=[1, 2]), "float32")
contexts *= F.sqrt(enc_lengths)
# out affine
contexts = self.out_affine(contexts)
return contexts, coefficients
def model_func(inputs, is_train=True):
# inputs = [src, src_sequence_length, trg, trg_sequence_length, label]
# src = fluid.data(name="src", shape=[None, None], dtype="int64")
# 源语言输入
src = inputs[0]
src_sequence_length = inputs[1]
src_embedding = fluid.embedding(
input=src,
size=[source_dict_size, hidden_dim],
dtype="float32",
param_attr=fluid.ParamAttr(name="src_emb_table"))
# 编码器
encoder_output, encoder_state = encoder(src_embedding, src_sequence_length)
encoder_output_proj = layers.fc(input=encoder_output,
size=decoder_size,
num_flatten_dims=2,
bias_attr=False)
src_mask = layers.sequence_mask(src_sequence_length,
maxlen=layers.shape(src)[1],
dtype="float32")
encoder_padding_mask = (src_mask - 1.0) * 1e9
# 目标语言输入，训练时有、预测生成时无该输入
trg = inputs[2] if is_train else None
# 解码器
output = decoder(encoder_output=encoder_output,
encoder_output_proj=encoder_output_proj,
encoder_state=encoder_state,
encoder_padding_mask=encoder_padding_mask,
trg=trg,
is_train=is_train)
return output
def model_func(inputs, is_train=True):
src = inputs[0]
src_sequence_length = inputs[1]
# source embedding
src_embeder = lambda x: fluid.embedding(
input=x,
size=[source_dict_size, hidden_dim],
dtype="float32",
param_attr=fluid.ParamAttr(name="src_emb_table"))
src_embedding = src_embeder(src)
# encoder
encoder_output, encoder_state = encoder(src_embedding, src_sequence_length)
encoder_output_proj = layers.fc(input=encoder_output,
size=decoder_size,
num_flatten_dims=2,
bias_attr=False)
src_mask = layers.sequence_mask(src_sequence_length,
maxlen=layers.shape(src)[1],
dtype="float32")
encoder_padding_mask = (src_mask - 1.0) * 1e9
trg = inputs[2] if is_train else None
# decoder
output = decoder(encoder_output=encoder_output,
encoder_output_proj=encoder_output_proj,
encoder_state=encoder_state,
encoder_padding_mask=encoder_padding_mask,
trg=trg,
is_train=is_train)
return output
def test_with_input_lengths(self):
mp = self.mp.clone()
sp = self.sp
rnn1 = self.rnn1
rnn2 = self.rnn2
exe = self.executor
scope = self.scope
x = np.random.randn(12, 4, 16)
if not self.time_major:
x = np.transpose(x, [1, 0, 2])
sequence_length = np.array([12, 10, 9, 8], dtype=np.int64)
y1, (h1, c1) = rnn1(x, sequence_length=sequence_length)
with paddle.fluid.unique_name.guard():
with paddle.static.program_guard(mp, sp):
x_data = paddle.data(
"input", [-1, -1, 16],
dtype=paddle.framework.get_default_dtype())
seq_len = paddle.data("seq_len", [-1], dtype="int64")
mask = sequence_mask(seq_len, dtype=paddle.get_default_dtype())
if self.time_major:
mask = paddle.transpose(mask, [1, 0])
y, (h, c) = rnn2(x_data, sequence_length=seq_len)
y = paddle.multiply(y, mask, axis=0)
feed_dict = {x_data.name: x, seq_len.name: sequence_length}
with paddle.static.scope_guard(scope):
y2, h2, c2 = exe.run(mp, feed=feed_dict, fetch_list=[y, h, c])
np.testing.assert_allclose(y1, y2, atol=1e-8, rtol=1e-5)
np.testing.assert_allclose(h1, h2, atol=1e-8, rtol=1e-5)
np.testing.assert_allclose(c1, c2, atol=1e-8, rtol=1e-5)
def forward(self, src, src_length):
# encoding
encoder_output, encoder_final_state = self.encoder(src, src_length)
# decoder initial states
decoder_initial_states = [
encoder_final_state,
self.decoder.lstm_attention.cell.get_initial_states(
batch_ref=encoder_output, shape=[self.hidden_size])
]
# attention mask to avoid paying attention on padddings
src_mask = layers.sequence_mask(
src_length,
maxlen=layers.shape(src)[1],
dtype=encoder_output.dtype)
encoder_padding_mask = (src_mask - 1.0) * 1e9
encoder_padding_mask = layers.unsqueeze(encoder_padding_mask, [1])
# Tile the batch dimension with beam_size
encoder_output = BeamSearchDecoder.tile_beam_merge_with_batch(
encoder_output, self.beam_size)
encoder_padding_mask = BeamSearchDecoder.tile_beam_merge_with_batch(
encoder_padding_mask, self.beam_size)
# dynamic decoding with beam search
rs, _ = self.beam_search_decoder(
inits=decoder_initial_states,
encoder_output=encoder_output,
encoder_padding_mask=encoder_padding_mask)
return rs
def _build_decoder(self, enc_final_state, mode='train', beam_size=10):
output_layer = lambda x: layers.fc(
x,
size=self.tar_vocab_size,
num_flatten_dims=len(x.shape) - 1,
param_attr=fluid.ParamAttr(
name="output_w",
initializer=fluid.initializer.UniformInitializer(
low=-self.init_scale, high=self.init_scale)),
bias_attr=False)
dec_cell = AttentionDecoderCell(self.num_layers, self.hidden_size,
self.dropout, self.init_scale)
dec_initial_states = [
enc_final_state,
dec_cell.get_initial_states(batch_ref=self.enc_output,
shape=[self.hidden_size])
]
max_src_seq_len = layers.shape(self.src)[1]
src_mask = layers.sequence_mask(self.src_sequence_length,
maxlen=max_src_seq_len,
dtype='float32')
enc_padding_mask = (src_mask - 1.0)
if mode == 'train':
dec_output, _ = rnn(cell=dec_cell,
inputs=self.tar_emb,
initial_states=dec_initial_states,
sequence_length=None,
enc_output=self.enc_output,
enc_padding_mask=enc_padding_mask)
dec_output = output_layer(dec_output)
elif mode == 'beam_search':
output_layer = lambda x: layers.fc(
x,
size=self.tar_vocab_size,
num_flatten_dims=len(x.shape) - 1,
param_attr=fluid.ParamAttr(name="output_w"),
bias_attr=False)
beam_search_decoder = BeamSearchDecoder(
dec_cell,
self.beam_start_token,
self.beam_end_token,
beam_size,
embedding_fn=self.tar_embeder,
output_fn=output_layer)
enc_output = beam_search_decoder.tile_beam_merge_with_batch(
self.enc_output, beam_size)
enc_padding_mask = beam_search_decoder.tile_beam_merge_with_batch(
enc_padding_mask, beam_size)
outputs, _ = dynamic_decode(beam_search_decoder,
inits=dec_initial_states,
max_step_num=self.beam_max_step_num,
enc_output=enc_output,
enc_padding_mask=enc_padding_mask)
return outputs
return dec_output
def loss_func(logits, label, trg_sequence_length):
probs = layers.softmax(logits)
loss = layers.cross_entropy(input=probs, label=label)
trg_mask = layers.sequence_mask(trg_sequence_length,
maxlen=layers.shape(logits)[1],
dtype="float32")
avg_cost = layers.reduce_sum(loss * trg_mask) / layers.reduce_sum(trg_mask)
return avg_cost
def simple_rnn(rnn_input,
init_hidden,
hidden_size,
kernel_param_attr=None,
recurrent_param_attr=None,
bias_attr=None,
act='relu',
sequence_length=None,
name='simple_rnn'):
# Transpose (sequence x batch x hidden)
rnn_input = layers.transpose(rnn_input, [1, 0, 2])
# Generate Mask
mask = None
if sequence_length:
max_seq_len = layers.shape(rnn_input)[0]
mask = layers.sequence_mask(sequence_length,
maxlen=max_seq_len,
dtype='float32')
mask = layers.transpose(mask, [1, 0])
# Init
simple_rnn = SimpleRNN_unit(rnn_input, hidden_size, kernel_param_attr,
recurrent_param_attr, bias_attr, act)
rnn = PaddingRNN()
with rnn.step():
step_in = rnn.step_input(rnn_input)
if mask:
step_mask = rnn.step_input(mask)
if init_hidden:
pre_hidden = rnn.memory(init=init_hidden)
else:
pre_hidden = rnn.memory(batch_ref=rnn_input,
shape=[-1, hidden_size])
last_hidden = simple_rnn(step_in, pre_hidden)
rnn.update_memory(pre_hidden, last_hidden)
rnn.step_output(last_hidden)
step_input = last_hidden
rnn_out = rnn()
last_hidden = rnn_out[-1]
last_hidden = layers.reshape(last_hidden, shape=[1, -1, hidden_size])
rnn_output = layers.transpose(rnn_out, [1, 0, 2])
last_hidden = layers.transpose(last_hidden, [1, 0, 2])
return rnn_out, last_hidden
def learn(self, probs, label, weight=None, length=None):
loss = layers.cross_entropy(input=probs, label=label, soft_label=False)
max_seq_len = layers.shape(probs)[1]
mask = layers.sequence_mask(length, maxlen=max_seq_len, dtype="float32")
loss = loss * mask
loss = layers.reduce_mean(loss, dim=[0])
loss = layers.reduce_sum(loss)
optimizer = fluid.optimizer.Adam(self.lr)
optimizer.minimize(loss)
return loss
def loss_func(logits, label, trg_sequence_length):
probs = layers.softmax(logits)
# 使用交叉熵损失函数
loss = layers.cross_entropy(input=probs, label=label)
# 根据长度生成掩码，并依此剔除 padding 部分计算的损失
trg_mask = layers.sequence_mask(trg_sequence_length,
maxlen=layers.shape(logits)[1],
dtype="float32")
avg_cost = layers.reduce_sum(loss * trg_mask) / layers.reduce_sum(trg_mask)
return avg_cost
def predict_test_util(place, mode):
place = paddle.set_device(place)
paddle.seed(123)
np.random.seed(123)
class Net(paddle.nn.Layer):
def __init__(self):
super(Net, self).__init__()
self.rnn = getattr(paddle.nn, mode)(16,
32,
2,
direction="bidirectional",
dropout=0.1)
def forward(self, input):
return self.rnn(input)
x = paddle.randn((4, 10, 16))
x.stop_gradient = False
seq_len = paddle.to_tensor(np.array([10, 6, 8, 5]))
mask = sequence_mask(seq_len, maxlen=10, dtype=x.dtype)
mask = paddle.unsqueeze(mask, [2])
rnn = Net()
y, _ = rnn(x)
y = y * mask
loss = paddle.mean(y)
loss.backward()
optimizer = paddle.optimizer.Adam(
learning_rate=0.1, parameters=rnn.parameters())
optimizer.step()
rnn.eval()
y, _ = rnn(x)
# `jit.to_static` would include a train_program, eval mode might cause
# some errors currently, such as dropout grad op gets `is_test == True`.
rnn.train()
rnn = paddle.jit.to_static(
rnn, [paddle.static.InputSpec(
shape=[None, None, 16], dtype=x.dtype)])
paddle.jit.save(rnn, "./inference/%s_infer" % mode)
paddle.enable_static()
new_scope = paddle.static.Scope()
with paddle.static.scope_guard(new_scope):
exe = paddle.static.Executor(place)
[inference_program, feed_target_names,
fetch_targets] = paddle.static.load_inference_model(
"./inference/%s_infer" % mode, exe)
results = exe.run(inference_program,
feed={feed_target_names[0]: x.numpy()},
fetch_list=fetch_targets)
np.testing.assert_equal(
y.numpy(), results[0]) # eval results equal predict results
paddle.disable_static()
def spec_loss(self, decoded, input, num_frames=None):
if num_frames is None:
l1_loss = F.reduce_mean(F.abs(decoded - input))
else:
# mask the <pad> part of the decoder
num_channels = decoded.shape[-1]
l1_loss = F.abs(decoded - input)
mask = F.sequence_mask(num_frames, dtype="float32")
l1_loss *= F.unsqueeze(mask, axes=[-1])
l1_loss = F.reduce_sum(l1_loss) / F.scale(F.reduce_sum(mask), num_channels)
return l1_loss
def forward(self, outputs, labels):
predict, (trg_length, label) = outputs[0], labels
# for target padding mask
mask = layers.sequence_mask(
trg_length, maxlen=layers.shape(predict)[1], dtype=predict.dtype)
cost = layers.softmax_with_cross_entropy(
logits=predict, label=label, soft_label=False)
masked_cost = layers.elementwise_mul(cost, mask, axis=0)
batch_mean_cost = layers.reduce_mean(masked_cost, dim=[0])
seq_cost = layers.reduce_sum(batch_mean_cost)
return seq_cost
def _birnn_encoder(self, inputs, input_len, name_lens, name_pos,
name_tok_len):
"""forward
Args:
inputs (Variable): shape=[batch_size, max_seq_len, hidden_size]
input_len (Variable): shape=[batch_size]
name_lens (Variable): shape=[batch_size]
name_pos (Variable): shape=[batch_size, max_name_len, max_tokens]
name_tok_len (Variable): shape=[batch_size, max_name_len]
Returns: TODO
Raises: NULL
"""
rnn_output, rnn_final_state = self._rnn_encoder.forward(
inputs, input_len)
max_name_len = name_pos.shape[1]
name_begin = name_pos[:, :, 0]
name_repr_mask = layers.sequence_mask(name_lens,
max_name_len,
dtype=name_tok_len.dtype)
len_delta = layers.elementwise_mul(name_tok_len - 1,
name_repr_mask,
axis=0)
name_end = name_begin + len_delta
if self._bidirectional:
name_fwd_repr_gathered = nn_utils.batch_gather_2d(
rnn_output, name_end)[:, :, :self._hidden_size]
name_bwd_repr_gathered = nn_utils.batch_gather_2d(
rnn_output, name_begin)[:, :, self._hidden_size:]
name_repr_gathered = layers.concat(
input=[name_fwd_repr_gathered, name_bwd_repr_gathered],
axis=-1)
new_hidden_size = self._hidden_size * 2
else:
name_repr_gathered = layers.gather_nd(rnn_output, name_end)
new_hidden_size = self._hidden_size
name_repr_tmp = layers.reshape(
name_repr_gathered, shape=[-1, max_name_len, new_hidden_size])
name_repr_mask = layers.cast(name_repr_mask, dtype=name_repr_tmp.dtype)
name_repr = layers.elementwise_mul(name_repr_tmp,
name_repr_mask,
axis=0)
return name_repr, None
def def_seq2seq_model(num_layers, hidden_size, dropout_prob, src_vocab_size,
trg_vocab_size):
"vanilla seq2seq model"
# data
source = fluid.data(name="src", shape=[None, None], dtype="int64")
source_length = fluid.data(name="src_sequence_length",
shape=[None],
dtype="int64")
target = fluid.data(name="trg", shape=[None, None], dtype="int64")
target_length = fluid.data(name="trg_sequence_length",
shape=[None],
dtype="int64")
label = fluid.data(name="label", shape=[None, None, 1], dtype="int64")
# embedding
src_emb = fluid.embedding(source, (src_vocab_size, hidden_size))
tar_emb = fluid.embedding(target, (src_vocab_size, hidden_size))
# encoder
enc_cell = EncoderCell(num_layers, hidden_size, dropout_prob)
enc_output, enc_final_state = dynamic_rnn(cell=enc_cell,
inputs=src_emb,
sequence_length=source_length)
# decoder
dec_cell = DecoderCell(num_layers, hidden_size, dropout_prob)
dec_output, dec_final_state = dynamic_rnn(cell=dec_cell,
inputs=tar_emb,
initial_states=enc_final_state)
logits = layers.fc(dec_output,
size=trg_vocab_size,
num_flatten_dims=len(dec_output.shape) - 1,
bias_attr=False)
# loss
loss = layers.softmax_with_cross_entropy(logits=logits,
label=label,
soft_label=False)
loss = layers.unsqueeze(loss, axes=[2])
max_tar_seq_len = layers.shape(target)[1]
tar_mask = layers.sequence_mask(target_length,
maxlen=max_tar_seq_len,
dtype="float32")
loss = loss * tar_mask
loss = layers.reduce_mean(loss, dim=[0])
loss = layers.reduce_sum(loss)
# optimizer
optimizer = fluid.optimizer.Adam(0.001)
optimizer.minimize(loss)
return loss
def __call__(self, src, src_length, trg=None, trg_length=None):
# encoder
encoder_output, encoder_final_state = self.encoder(
self.src_embeder(src), src_length)
decoder_initial_states = [
encoder_final_state,
self.decoder.decoder_cell.get_initial_states(
batch_ref=encoder_output, shape=[encoder_output.shape[-1]])
]
src_mask = layers.sequence_mask(src_length,
maxlen=layers.shape(src)[1],
dtype="float32")
encoder_padding_mask = (src_mask - 1.0) * 1e9
encoder_padding_mask = layers.unsqueeze(encoder_padding_mask, [1])
# decoder
decoder_kwargs = {
"inputs": self.trg_embeder(trg),
"sequence_length": trg_length,
} if self.decoder.decoding_strategy == "train_greedy" else (
{
"embedding_fn": self.trg_embeder,
"beam_size": self.beam_size,
"start_token": self.start_token,
"end_token": self.end_token
} if self.decoder.decoding_strategy == "beam_search" else {
"embedding_fn":
self.trg_embeder,
"start_tokens":
layers.fill_constant_batch_size_like(input=encoder_output,
shape=[-1],
dtype=src.dtype,
value=self.start_token),
"end_token":
self.end_token
})
decoder_kwargs["output_layer"] = self.output_layer
(decoder_output, decoder_final_state,
dec_seq_lengths) = self.decoder(decoder_initial_states,
encoder_output, encoder_padding_mask,
**decoder_kwargs)
if self.decoder.decoding_strategy == "beam_search": # for inference
return decoder_output
logits, samples, sample_length = (decoder_output.cell_outputs,
decoder_output.sample_ids,
dec_seq_lengths)
probs = layers.softmax(logits)
return probs, samples, sample_length
def _compute_loss(self, dec_output):
loss = layers.softmax_with_cross_entropy(logits=dec_output,
label=self.label,
soft_label=False)
loss = layers.unsqueeze(loss, axes=[2])
max_tar_seq_len = layers.shape(self.tar)[1]
tar_mask = layers.sequence_mask(self.tar_sequence_length,
maxlen=max_tar_seq_len,
dtype='float32')
loss = loss * tar_mask
loss = layers.reduce_mean(loss, dim=[0])
loss = layers.reduce_sum(loss)
return loss
def recv_func(msg):
pad_value = L.assign(input=np.array([0.0], dtype=np.float32))
output, length = L.sequence_pad(msg, pad_value, maxlen=max_neigh)
mask = L.sequence_mask(length, dtype="float32", maxlen=max_neigh)
mask = L.unsqueeze(mask, [2])
input_mask = (L.matmul(mask, mask, transpose_y=True) - 1) * -10000
for layer in range(num_layers):
output = self_attention_and_residual(output,
hidden_size,
input_mask,
name="cross_feat_%s" % layer,
maxlen=max_neigh)
return L.reduce_sum(output * mask, 1) / L.reduce_sum(mask, 1)
def _select_table(condition,
inputs,
table_enc,
table_len,
table_mask_by_col,
ptr_net,
grammar,
name=None):
"""select_table.
Args:
condition (TYPE): NULL
inputs (Variable): shape = [batch_size, max_len, hidden_size]. infer 阶段 max_len 恒为1
table_enc (TYPE): NULL
table_len (TYPE): NULL
ptr_net (TYPE): NULL
grammar (TYPE): NULL
name (str):
table_mask_by_col (Variable):
Returns: TODO
Raises: NULL
"""
condition = layers.cast(condition, dtype='float32')
table_mask_by_len = layers.sequence_mask(table_len,
maxlen=grammar.MAX_TABLE,
dtype='float32')
table_mask_by_len = layers.reshape(table_mask_by_len,
[-1, grammar.MAX_TABLE])
table_mask_by_col = layers.reshape(table_mask_by_col,
[-1, grammar.MAX_TABLE])
table_mask = layers.elementwise_mul(table_mask_by_len, table_mask_by_col)
predicts = ptr_net.forward(inputs, table_enc, table_mask)
zeros_l = tensor.fill_constant_batch_size_like(
predicts,
shape=[-1, grammar.grammar_size],
dtype='float32',
value=-INF)
zeros_r = tensor.fill_constant_batch_size_like(
predicts,
shape=[-1, grammar.MAX_COLUMN + grammar.MAX_VALUE],
dtype='float32',
value=-INF)
final_output = tensor.concat([zeros_l, predicts, zeros_r], axis=-1)
true_final_output = layers.elementwise_mul(final_output, condition, axis=0)
return true_final_output
def _select_column(condition,
inputs,
column_enc,
column_len,
ptr_net,
grammar,
column2table_mask,
name=None):
"""select_column.
Args:
condition (TYPE): NULL
inputs (Variable): shape = [batch_size, max_len, hidden_size]. infer 阶段 max_len 恒为1
column_enc (TYPE): NULL
column_len (TYPE): NULL
ptr_net (TYPE): NULL
grammar (TYPE): NULL
column2table_mask (Variable):
name (str):
Returns: TODO
Raises: NULL
"""
condition = layers.cast(condition, dtype='float32')
column_mask = layers.sequence_mask(column_len,
maxlen=grammar.MAX_COLUMN,
dtype='float32')
column_mask = layers.reshape(column_mask, [-1, grammar.MAX_COLUMN])
predicts = ptr_net.forward(inputs, column_enc, column_mask)
pred_ids = layers.argmax(predicts, axis=-1)
valid_table_mask = nn_utils.batch_gather(column2table_mask, pred_ids)
## concat zeros to vocab size
zeros_l = tensor.fill_constant_batch_size_like(
predicts,
shape=[-1, grammar.grammar_size + grammar.MAX_TABLE],
dtype='float32',
value=-INF)
zeros_r = tensor.fill_constant_batch_size_like(
predicts, shape=[-1, grammar.MAX_VALUE], dtype='float32', value=-INF)
final_output = tensor.concat([zeros_l, predicts, zeros_r], axis=-1)
true_final_output = layers.elementwise_mul(final_output, condition, axis=0)
true_valid_table_mask = layers.elementwise_mul(valid_table_mask,
condition,
axis=0)
return true_final_output, true_valid_table_mask
def _compute_loss(self, dec_output):
loss = layers.softmax_with_cross_entropy(logits=dec_output,
label=self.label,
soft_label=False)
loss = layers.reshape(loss, shape=[self.batch_size, -1])
max_tar_seq_len = layers.shape(self.tar)[1]
tar_mask = layers.sequence_mask(self.tar_sequence_length,
maxlen=max_tar_seq_len,
dtype='float32')
loss = loss * tar_mask
loss = layers.reduce_mean(loss, dim=[0])
loss = layers.reduce_sum(loss)
loss.permissions = True
return loss
def test_with_input_lengths(self):
rnn1 = self.rnn1
rnn2 = self.rnn2
x = np.random.randn(12, 4, 16)
if not self.time_major:
x = np.transpose(x, [1, 0, 2])
sequence_length = np.array([12, 10, 9, 8], dtype=np.int64)
y1, h1 = rnn1(x, sequence_length=sequence_length)
seq_len = paddle.to_variable(sequence_length)
mask = sequence_mask(seq_len, dtype=paddle.get_default_dtype())
if self.time_major:
mask = paddle.transpose(mask, [1, 0])
y2, h2 = rnn2(paddle.to_variable(x), sequence_length=seq_len)
y2 = paddle.multiply(y2, mask, axis=0)
np.testing.assert_allclose(y1, y2.numpy(), atol=1e-8, rtol=1e-5)
np.testing.assert_allclose(h1, h2.numpy(), atol=1e-8, rtol=1e-5)
def _compute_loss(self, mean, logvars, dec_output):
kl_loss = self._kl_dvg(mean, logvars)
rec_loss = layers.softmax_with_cross_entropy(logits=dec_output,
label=self.label,
soft_label=False)
rec_loss = layers.reshape(rec_loss, shape=[self.batch_size, -1])
max_tar_seq_len = layers.shape(self.tar)[1]
tar_mask = layers.sequence_mask(self.tar_sequence_length,
maxlen=max_tar_seq_len,
dtype='float32')
rec_loss = rec_loss * tar_mask
rec_loss = layers.reduce_mean(rec_loss, dim=[0])
rec_loss = layers.reduce_sum(rec_loss)
loss = kl_loss * self.kl_weight + rec_loss
return loss, kl_loss, rec_loss
def _select_value(condition,
inputs,
value_enc,
value_len,
ptr_net,
grammar,
name=None):
"""select_value.
Args:
condition (TYPE): NULL
inputs (TYPE): NULL
value_enc (TYPE): NULL
value_len (TYPE): NULL
ptr_net (TYPE): NULL
grammar (TYPE): NULL
Returns: TODO
Raises: NULL
"""
condition = layers.cast(condition, dtype='float32')
value_mask = layers.sequence_mask(value_len,
maxlen=grammar.MAX_VALUE,
dtype='float32')
value_mask = layers.reshape(value_mask, [-1, grammar.MAX_VALUE])
predicts = ptr_net.forward(inputs, value_enc, value_mask)
## concat zeros to vocab size
zeros_l = tensor.fill_constant_batch_size_like(
predicts,
shape=[
-1, grammar.grammar_size + grammar.MAX_TABLE + grammar.MAX_COLUMN
],
dtype='float32',
value=-INF)
final_output = tensor.concat([zeros_l, predicts], axis=-1)
true_final_output = layers.elementwise_mul(final_output, condition, axis=0)
return true_final_output
def test_with_input_lengths(self):
rnn1 = self.rnn1
rnn2 = self.rnn2
x = np.random.randn(12, 4, 16)
if not self.time_major:
x = np.transpose(x, [1, 0, 2])
sequence_length = np.array([12, 10, 9, 8], dtype=np.int64)
y1, (fw_h1, bw_h1) = rnn1(x, sequence_length=sequence_length)
seq_len = paddle.to_tensor(sequence_length)
mask = sequence_mask(seq_len, dtype=paddle.get_default_dtype())
if self.time_major:
mask = paddle.transpose(mask, [1, 0])
y2, (fw_h2, bw_h2) = rnn2(paddle.to_tensor(x), sequence_length=seq_len)
mask = paddle.unsqueeze(mask, -1)
y2 = paddle.multiply(y2, mask)
np.testing.assert_allclose(y1, y2.numpy(), atol=1e-8, rtol=1e-5)
np.testing.assert_allclose(fw_h1, fw_h2.numpy(), atol=1e-8, rtol=1e-5)
np.testing.assert_allclose(bw_h1, bw_h2.numpy(), atol=1e-8, rtol=1e-5)
def forward(self, src, src_length, trg):
# encoder
encoder_output, encoder_final_state = self.encoder(src, src_length)
# decoder initial states: use input_feed and the structure is
# [[h,c] * num_layers, input_feed], consistent with DecoderCell.states
decoder_initial_states = [
encoder_final_state,
self.decoder.lstm_attention.cell.get_initial_states(
batch_ref=encoder_output, shape=[self.hidden_size])
]
# attention mask to avoid paying attention on padddings
src_mask = layers.sequence_mask(src_length,
maxlen=layers.shape(src)[1],
dtype=encoder_output.dtype)
encoder_padding_mask = (src_mask - 1.0) * 1e9
encoder_padding_mask = layers.unsqueeze(encoder_padding_mask, [1])
# decoder with attentioon
predict = self.decoder(trg, decoder_initial_states, encoder_output,
encoder_padding_mask)
return predict
def gen_mask(valid_lengths, max_len, dtype="float32"):
"""
Generate a mask tensor from valid lengths. note that it return a *reverse*
mask. Indices within valid lengths correspond to 0, and those within
padding area correspond to 1.
Assume that valid_lengths = [2,5,7], and max_len = 7, the generated mask is
[[0, 0, 1, 1, 1, 1, 1],
[0, 0, 0, 0, 0, 1, 1],
[0, 0, 0, 0, 0, 0, 0]].
Args:
valid_lengths (Variable): shape(B, ), dtype: int64. A rank-1 Tensor containing the valid lengths (timesteps) of each example, where B means beatch_size.
max_len (int): The length (number of time steps) of the mask.
dtype (str, optional): A string that specifies the data type of the returned mask. Defaults to 'float32'.
Returns:
mask (Variable): shape(B, max_len), dtype float32, a mask computed from valid lengths.
"""
mask = F.sequence_mask(valid_lengths, maxlen=max_len, dtype=dtype)
mask = 1 - mask
return mask
def _simple_sum_encoder(self, inputs, input_len, name_lens, name_pos,
name_tok_len):
"""forward
Args:
inputs (Variable): shape=[batch_size, max_seq_len, hidden_size]
input_len (Variable): shape=[batch_size]
name_lens (Variable): shape=[batch_size]
name_pos (Variable): shape=[batch_size, max_name_len, max_tokens]
name_tok_len (Variable): shape=[batch_size, max_name_len]
Returns: TODO
Raises: NULL
"""
max_name_len = name_pos.shape[1]
max_name_tok_len = name_pos.shape[2]
hidden_size = inputs.shape[2]
name_pos_1d = layers.reshape(
name_pos, shape=[-1, max_name_len * max_name_tok_len])
name_enc = nn_utils.batch_gather_2d(inputs, name_pos_1d)
name_enc = layers.reshape(
name_enc, shape=[-1, max_name_len, max_name_tok_len, hidden_size])
# shape = [batch_size, name_len, token_len, hidden_size]
name_tok_mask = layers.sequence_mask(name_tok_len,
maxlen=max_name_tok_len,
dtype=name_enc.dtype)
name_enc_masked = layers.elementwise_mul(name_enc,
name_tok_mask,
axis=0)
# shape = [batch_size, name_len, hidden_size]
output = layers.reduce_sum(name_enc_masked, dim=2)
return output, None
def basic_lstm(input,
init_hidden,
init_cell,
hidden_size,
num_layers=1,
sequence_length=None,
dropout_prob=0.0,
bidirectional=False,
batch_first=True,
param_attr=None,
bias_attr=None,
gate_activation=None,
activation=None,
forget_bias=1.0,
dtype='float32',
name='basic_lstm'):
"""
LSTM implementation using basic operators, supports multiple layers and bidirectional LSTM.
.. math::
i_t &= \sigma(W_{ix}x_{t} + W_{ih}h_{t-1} + b_i)
f_t &= \sigma(W_{fx}x_{t} + W_{fh}h_{t-1} + b_f + forget_bias )
o_t &= \sigma(W_{ox}x_{t} + W_{oh}h_{t-1} + b_o)
\\tilde{c_t} &= tanh(W_{cx}x_t + W_{ch}h_{t-1} + b_c)
c_t &= f_t \odot c_{t-1} + i_t \odot \\tilde{c_t}
h_t &= o_t \odot tanh(c_t)
Args:
input (Variable): lstm input tensor,
if batch_first = False, shape should be ( seq_len x batch_size x input_size )
if batch_first = True, shape should be ( batch_size x seq_len x hidden_size )
init_hidden(Variable|None): The initial hidden state of the LSTM
This is a tensor with shape ( num_layers x batch_size x hidden_size)
if is_bidirec = True, shape should be ( num_layers*2 x batch_size x hidden_size)
and can be reshaped to a tensor with shape ( num_layers x 2 x batch_size x hidden_size) to use.
If it's None, it will be set to all 0.
init_cell(Variable|None): The initial hidden state of the LSTM
This is a tensor with shape ( num_layers x batch_size x hidden_size)
if is_bidirec = True, shape should be ( num_layers*2 x batch_size x hidden_size)
and can be reshaped to a tensor with shape ( num_layers x 2 x batch_size x hidden_size) to use.
If it's None, it will be set to all 0.
hidden_size (int): Hidden size of the LSTM
num_layers (int): The total number of layers of the LSTM
sequence_length (Variabe|None): A tensor (shape [batch_size]) stores each real length of each instance,
This tensor will be convert to a mask to mask the padding ids
If it's None means NO padding ids
dropout_prob(float|0.0): Dropout prob, dropout ONLY work after rnn output of each layers,
NOT between time steps
bidirectional (bool|False): If it is bidirectional
batch_first (bool|True): The shape format of the input and output tensors. If true,
the shape format should be :attr:`[batch_size, seq_len, hidden_size]`. If false,
the shape format should be :attr:`[seq_len, batch_size, hidden_size]`. By default
this function accepts input and emits output in batch-major form to be consistent
with most of data format, though a bit less efficient because of extra transposes.
param_attr(ParamAttr|None): The parameter attribute for the learnable
weight matrix. Note:
If it is set to None or one attribute of ParamAttr, lstm_unit will
create ParamAttr as param_attr. If the Initializer of the param_attr
is not set, the parameter is initialized with Xavier. Default: None.
bias_attr (ParamAttr|None): The parameter attribute for the bias
of LSTM unit.
If it is set to None or one attribute of ParamAttr, lstm_unit will
create ParamAttr as bias_attr. If the Initializer of the bias_attr
is not set, the bias is initialized zero. Default: None.
gate_activation (function|None): The activation function for gates (actGate).
Default: 'fluid.layers.sigmoid'
activation (function|None): The activation function for cell (actNode).
Default: 'fluid.layers.tanh'
forget_bias (float|1.0) : Forget bias used to compute the forget gate
dtype(string): Data type used in this unit
name(string): Name used to identify parameters and biases
Returns:
rnn_out(Tensor), last_hidden(Tensor), last_cell(Tensor)
- rnn_out is the result of LSTM hidden, shape is (seq_len x batch_size x hidden_size) \
if is_bidirec set to True, it's shape will be ( seq_len x batch_sze x hidden_size*2)
- last_hidden is the hidden state of the last step of LSTM \
with shape ( num_layers x batch_size x hidden_size ) \
if is_bidirec set to True, it's shape will be ( num_layers*2 x batch_size x hidden_size),
and can be reshaped to a tensor ( num_layers x 2 x batch_size x hidden_size) to use.
- last_cell is the hidden state of the last step of LSTM \
with shape ( num_layers x batch_size x hidden_size ) \
if is_bidirec set to True, it's shape will be ( num_layers*2 x batch_size x hidden_size),
and can be reshaped to a tensor ( num_layers x 2 x batch_size x hidden_size) to use.
Examples:
.. code-block:: python
import paddle.fluid.layers as layers
from paddle.fluid.contrib.layers import basic_lstm
batch_size = 20
input_size = 128
hidden_size = 256
num_layers = 2
dropout = 0.5
bidirectional = True
batch_first = False
input = layers.data( name = "input", shape = [-1, batch_size, input_size], dtype='float32')
pre_hidden = layers.data( name = "pre_hidden", shape=[-1, hidden_size], dtype='float32')
pre_cell = layers.data( name = "pre_cell", shape=[-1, hidden_size], dtype='float32')
sequence_length = layers.data( name="sequence_length", shape=[-1], dtype='int32')
rnn_out, last_hidden, last_cell = basic_lstm( input, pre_hidden, pre_cell, \
hidden_size, num_layers = num_layers, \
sequence_length = sequence_length, dropout_prob=dropout, bidirectional = bidirectional, \
batch_first = batch_first)
"""
fw_unit_list = []
for i in range(num_layers):
new_name = name + "_layers_" + str(i)
if param_attr is not None and param_attr.name is not None:
layer_param_attr = copy.deepcopy(param_attr)
layer_param_attr.name += "_fw_w_" + str(i)
else:
layer_param_attr = param_attr
if bias_attr is not None and bias_attr.name is not None:
layer_bias_attr = copy.deepcopy(bias_attr)
layer_bias_attr.name += "_fw_b_" + str(i)
else:
layer_bias_attr = bias_attr
fw_unit_list.append(
BasicLSTMUnit(new_name,
hidden_size,
param_attr=layer_param_attr,
bias_attr=layer_bias_attr,
gate_activation=gate_activation,
activation=activation,
forget_bias=forget_bias,
dtype=dtype))
if bidirectional:
bw_unit_list = []
for i in range(num_layers):
new_name = name + "_reverse_layers_" + str(i)
if param_attr is not None and param_attr.name is not None:
layer_param_attr = copy.deepcopy(param_attr)
layer_param_attr.name += "_bw_w_" + str(i)
else:
layer_param_attr = param_attr
if bias_attr is not None and bias_attr.name is not None:
layer_bias_attr = copy.deepcopy(bias_attr)
layer_bias_attr.name += "_bw_b_" + str(i)
else:
layer_bias_attr = param_attr
bw_unit_list.append(
BasicLSTMUnit(new_name,
hidden_size,
param_attr=layer_param_attr,
bias_attr=layer_bias_attr,
gate_activation=gate_activation,
activation=activation,
forget_bias=forget_bias,
dtype=dtype))
if batch_first:
input = layers.transpose(input, [1, 0, 2])
mask = None
if sequence_length:
max_seq_len = layers.shape(input)[0]
mask = layers.sequence_mask(sequence_length,
maxlen=max_seq_len,
dtype='float32')
mask = layers.transpose(mask, [1, 0])
direc_num = 1
if bidirectional:
direc_num = 2
# convert to [num_layers, 2, batch_size, hidden_size]
if init_hidden:
init_hidden = layers.reshape(
init_hidden, shape=[num_layers, direc_num, -1, hidden_size])
init_cell = layers.reshape(
init_cell, shape=[num_layers, direc_num, -1, hidden_size])
# forward direction
def get_single_direction_output(rnn_input,
unit_list,
mask=None,
direc_index=0):
rnn = StaticRNN()
with rnn.step():
step_input = rnn.step_input(rnn_input)
if mask:
step_mask = rnn.step_input(mask)
for i in range(num_layers):
if init_hidden:
pre_hidden = rnn.memory(init=init_hidden[i, direc_index])
pre_cell = rnn.memory(init=init_cell[i, direc_index])
else:
pre_hidden = rnn.memory(batch_ref=rnn_input,
shape=[-1, hidden_size])
pre_cell = rnn.memory(batch_ref=rnn_input,
shape=[-1, hidden_size])
new_hidden, new_cell = unit_list[i](step_input, pre_hidden,
pre_cell)
if mask:
new_hidden = layers.elementwise_mul(
new_hidden, step_mask,
axis=0) - layers.elementwise_mul(pre_hidden,
(step_mask - 1),
axis=0)
new_cell = layers.elementwise_mul(
new_cell, step_mask, axis=0) - layers.elementwise_mul(
pre_cell, (step_mask - 1), axis=0)
rnn.update_memory(pre_hidden, new_hidden)
rnn.update_memory(pre_cell, new_cell)
rnn.step_output(new_hidden)
rnn.step_output(new_cell)
step_input = new_hidden
if dropout_prob != None and dropout_prob > 0.0:
step_input = layers.dropout(
step_input,
dropout_prob=dropout_prob,
dropout_implementation='upscale_in_train')
rnn.step_output(step_input)
rnn_out = rnn()
last_hidden_array = []
last_cell_array = []
rnn_output = rnn_out[-1]
for i in range(num_layers):
last_hidden = rnn_out[i * 2]
last_hidden = last_hidden[-1]
last_hidden_array.append(last_hidden)
last_cell = rnn_out[i * 2 + 1]
last_cell = last_cell[-1]
last_cell_array.append(last_cell)
last_hidden_output = layers.concat(last_hidden_array, axis=0)
last_hidden_output = layers.reshape(
last_hidden_output, shape=[num_layers, -1, hidden_size])
last_cell_output = layers.concat(last_cell_array, axis=0)
last_cell_output = layers.reshape(last_cell_output,
shape=[num_layers, -1, hidden_size])
return rnn_output, last_hidden_output, last_cell_output
# seq_len, batch_size, hidden_size
fw_rnn_out, fw_last_hidden, fw_last_cell = get_single_direction_output(
input, fw_unit_list, mask, direc_index=0)
if bidirectional:
bw_input = layers.reverse(input, axis=[0])
bw_mask = None
if mask:
bw_mask = layers.reverse(mask, axis=[0])
bw_rnn_out, bw_last_hidden, bw_last_cell = get_single_direction_output(
bw_input, bw_unit_list, bw_mask, direc_index=1)
bw_rnn_out = layers.reverse(bw_rnn_out, axis=[0])
rnn_out = layers.concat([fw_rnn_out, bw_rnn_out], axis=2)
last_hidden = layers.concat([fw_last_hidden, bw_last_hidden], axis=1)
last_hidden = layers.reshape(
last_hidden, shape=[num_layers * direc_num, -1, hidden_size])
last_cell = layers.concat([fw_last_cell, bw_last_cell], axis=1)
last_cell = layers.reshape(
last_cell, shape=[num_layers * direc_num, -1, hidden_size])
if batch_first:
rnn_out = layers.transpose(rnn_out, [1, 0, 2])
return rnn_out, last_hidden, last_cell
else:
rnn_out = fw_rnn_out
last_hidden = fw_last_hidden
last_cell = fw_last_cell
if batch_first:
rnn_out = layers.transpose(rnn_out, [1, 0, 2])
return rnn_out, last_hidden, last_cell
def basic_gru(input,
init_hidden,
hidden_size,
num_layers=1,
sequence_length=None,
dropout_prob=0.0,
bidirectional=False,
batch_first=True,
param_attr=None,
bias_attr=None,
gate_activation=None,
activation=None,
dtype='float32',
name='basic_gru'):
"""
GRU implementation using basic operator, supports multiple layers and bidirectional gru.
.. math::
u_t & = actGate(W_ux xu_{t} + W_uh h_{t-1} + b_u)
r_t & = actGate(W_rx xr_{t} + W_rh h_{t-1} + b_r)
m_t & = actNode(W_cx xm_t + W_ch dot(r_t, h_{t-1}) + b_m)
h_t & = dot(u_t, h_{t-1}) + dot((1-u_t), m_t)
Args:
input (Variable): GRU input tensor,
if batch_first = False, shape should be ( seq_len x batch_size x input_size )
if batch_first = True, shape should be ( batch_size x seq_len x hidden_size )
init_hidden(Variable|None): The initial hidden state of the GRU
This is a tensor with shape ( num_layers x batch_size x hidden_size)
if is_bidirec = True, shape should be ( num_layers*2 x batch_size x hidden_size)
and can be reshaped to tensor with ( num_layers x 2 x batch_size x hidden_size) to use.
If it's None, it will be set to all 0.
hidden_size (int): Hidden size of the GRU
num_layers (int): The total number of layers of the GRU
sequence_length (Variabe|None): A Tensor (shape [batch_size]) stores each real length of each instance,
This tensor will be convert to a mask to mask the padding ids
If it's None means NO padding ids
dropout_prob(float|0.0): Dropout prob, dropout ONLY works after rnn output of each layers,
NOT between time steps
bidirectional (bool|False): If it is bidirectional
batch_first (bool|True): The shape format of the input and output tensors. If true,
the shape format should be :attr:`[batch_size, seq_len, hidden_size]`. If false,
the shape format should be :attr:`[seq_len, batch_size, hidden_size]`. By default
this function accepts input and emits output in batch-major form to be consistent
with most of data format, though a bit less efficient because of extra transposes.
param_attr(ParamAttr|None): The parameter attribute for the learnable
weight matrix. Note:
If it is set to None or one attribute of ParamAttr, gru_unit will
create ParamAttr as param_attr. If the Initializer of the param_attr
is not set, the parameter is initialized with Xavier. Default: None.
bias_attr (ParamAttr|None): The parameter attribute for the bias
of GRU unit.
If it is set to None or one attribute of ParamAttr, gru_unit will
create ParamAttr as bias_attr. If the Initializer of the bias_attr
is not set, the bias is initialized zero. Default: None.
gate_activation (function|None): The activation function for gates (actGate).
Default: 'fluid.layers.sigmoid'
activation (function|None): The activation function for cell (actNode).
Default: 'fluid.layers.tanh'
dtype(string): data type used in this unit
name(string): name used to identify parameters and biases
Returns:
rnn_out(Tensor),last_hidden(Tensor)
- rnn_out is result of GRU hidden, with shape (seq_len x batch_size x hidden_size) \
if is_bidirec set to True, shape will be ( seq_len x batch_sze x hidden_size*2)
- last_hidden is the hidden state of the last step of GRU \
shape is ( num_layers x batch_size x hidden_size ) \
if is_bidirec set to True, shape will be ( num_layers*2 x batch_size x hidden_size),
can be reshaped to a tensor with shape( num_layers x 2 x batch_size x hidden_size)
Examples:
.. code-block:: python
import paddle.fluid.layers as layers
from paddle.fluid.contrib.layers import basic_gru
batch_size = 20
input_size = 128
hidden_size = 256
num_layers = 2
dropout = 0.5
bidirectional = True
batch_first = False
input = layers.data( name = "input", shape = [-1, batch_size, input_size], dtype='float32')
pre_hidden = layers.data( name = "pre_hidden", shape=[-1, hidden_size], dtype='float32')
sequence_length = layers.data( name="sequence_length", shape=[-1], dtype='int32')
rnn_out, last_hidden = basic_gru( input, pre_hidden, hidden_size, num_layers = num_layers, \
sequence_length = sequence_length, dropout_prob=dropout, bidirectional = bidirectional, \
batch_first = batch_first)
"""
fw_unit_list = []
for i in range(num_layers):
new_name = name + "_layers_" + str(i)
if param_attr is not None and param_attr.name is not None:
layer_param_attr = copy.deepcopy(param_attr)
layer_param_attr.name += "_fw_w_" + str(i)
else:
layer_param_attr = param_attr
if bias_attr is not None and bias_attr.name is not None:
layer_bias_attr = copy.deepcopy(bias_attr)
layer_bias_attr.name += "_fw_b_" + str(i)
else:
layer_bias_attr = bias_attr
fw_unit_list.append(
BasicGRUUnit(new_name, hidden_size, layer_param_attr,
layer_bias_attr, gate_activation, activation, dtype))
if bidirectional:
bw_unit_list = []
for i in range(num_layers):
new_name = name + "_reverse_layers_" + str(i)
if param_attr is not None and param_attr.name is not None:
layer_param_attr = copy.deepcopy(param_attr)
layer_param_attr.name += "_bw_w_" + str(i)
else:
layer_param_attr = param_attr
if bias_attr is not None and bias_attr.name is not None:
layer_bias_attr = copy.deepcopy(bias_attr)
layer_bias_attr.name += "_bw_b_" + str(i)
else:
layer_bias_attr = bias_attr
bw_unit_list.append(
BasicGRUUnit(new_name, hidden_size, layer_param_attr,
layer_bias_attr, gate_activation, activation,
dtype))
if batch_first:
input = layers.transpose(input, [1, 0, 2])
mask = None
if sequence_length:
max_seq_len = layers.shape(input)[0]
mask = layers.sequence_mask(sequence_length,
maxlen=max_seq_len,
dtype='float32')
mask = layers.transpose(mask, [1, 0])
direc_num = 1
if bidirectional:
direc_num = 2
if init_hidden:
init_hidden = layers.reshape(
init_hidden, shape=[num_layers, direc_num, -1, hidden_size])
def get_single_direction_output(rnn_input,
unit_list,
mask=None,
direc_index=0):
rnn = StaticRNN()
with rnn.step():
step_input = rnn.step_input(rnn_input)
if mask:
step_mask = rnn.step_input(mask)
for i in range(num_layers):
if init_hidden:
pre_hidden = rnn.memory(init=init_hidden[i, direc_index])
else:
pre_hidden = rnn.memory(batch_ref=rnn_input,
shape=[-1, hidden_size],
ref_batch_dim_idx=1)
new_hidden = unit_list[i](step_input, pre_hidden)
if mask:
new_hidden = layers.elementwise_mul(
new_hidden, step_mask,
axis=0) - layers.elementwise_mul(pre_hidden,
(step_mask - 1),
axis=0)
rnn.update_memory(pre_hidden, new_hidden)
rnn.step_output(new_hidden)
step_input = new_hidden
if dropout_prob != None and dropout_prob > 0.0:
step_input = layers.dropout(
step_input,
dropout_prob=dropout_prob,
)
rnn.step_output(step_input)
rnn_out = rnn()
last_hidden_array = []
rnn_output = rnn_out[-1]
for i in range(num_layers):
last_hidden = rnn_out[i]
last_hidden = last_hidden[-1]
last_hidden_array.append(last_hidden)
last_hidden_output = layers.concat(last_hidden_array, axis=0)
last_hidden_output = layers.reshape(
last_hidden_output, shape=[num_layers, -1, hidden_size])
return rnn_output, last_hidden_output
# seq_len, batch_size, hidden_size
fw_rnn_out, fw_last_hidden = get_single_direction_output(input,
fw_unit_list,
mask,
direc_index=0)
if bidirectional:
bw_input = layers.reverse(input, axis=[0])
bw_mask = None
if mask:
bw_mask = layers.reverse(mask, axis=[0])
bw_rnn_out, bw_last_hidden = get_single_direction_output(bw_input,
bw_unit_list,
bw_mask,
direc_index=1)
bw_rnn_out = layers.reverse(bw_rnn_out, axis=[0])
rnn_out = layers.concat([fw_rnn_out, bw_rnn_out], axis=2)
last_hidden = layers.concat([fw_last_hidden, bw_last_hidden], axis=1)
last_hidden = layers.reshape(
last_hidden, shape=[num_layers * direc_num, -1, hidden_size])
if batch_first:
rnn_out = layers.transpose(rnn_out, [1, 0, 2])
return rnn_out, last_hidden
else:
rnn_out = fw_rnn_out
last_hidden = fw_last_hidden
if batch_first:
rnn_out = layers.transpose(rnn_out, [1, 0, 2])
return rnn_out, last_hidden
