def attn_flow(q_enc, p_enc, p_ids_name, args):
"""Bidirectional Attention layer"""
tag = p_ids_name + "__"
drnn = layers.DynamicRNN()
with drnn.block():
h_cur = drnn.step_input(p_enc)
u_all = drnn.static_input(q_enc)
h_expd = layers.sequence_expand(x=h_cur, y=u_all)
s_t_mul = layers.elementwise_mul(x=u_all, y=h_expd, axis=0)
s_t_sum = layers.reduce_sum(input=s_t_mul, dim=1, keep_dim=True)
s_t_re = layers.reshape(s_t_sum, shape=[-1, 0])
s_t = layers.sequence_softmax(input=s_t_re)
u_expr = layers.elementwise_mul(x=u_all, y=s_t, axis=0)
u_expr = layers.sequence_pool(input=u_expr, pool_type='sum')
b_t = layers.sequence_pool(input=s_t_sum, pool_type='max')
drnn.output(u_expr, b_t)
U_expr, b = drnn()
b_norm = layers.sequence_softmax(input=b)
h_expr = layers.elementwise_mul(x=p_enc, y=b_norm, axis=0)
h_expr = layers.sequence_pool(input=h_expr, pool_type='sum')
H_expr = layers.sequence_expand(x=h_expr, y=p_enc)
H_expr = layers.lod_reset(x=H_expr, y=p_enc)
h_u = layers.elementwise_mul(x=p_enc, y=U_expr, axis=0)
h_h = layers.elementwise_mul(x=p_enc, y=H_expr, axis=0)
g = layers.concat(input=[p_enc, U_expr, h_u, h_h], axis=1)
return dropout(g, args)
def custom_dynamic_rnn(p_vec, init_state, decoder_size):
context = layers.fc(input=p_vec,
size=decoder_size,
act=None)
drnn = layers.DynamicRNN()
with drnn.block():
H_s = drnn.step_input(p_vec)
ctx = drnn.static_input(context)
c_prev = drnn.memory(init=init_state, need_reorder=True)
m_prev = drnn.memory(init=init_state, need_reorder=True)
m_prev1 = layers.fc(input=m_prev, size=decoder_size, act=None)
m_prev1 = layers.sequence_expand(x=m_prev1, y=ctx)
Fk = ctx + m_prev1
Fk = layers.fc(input=Fk, size=decoder_size, act='tanh')
logits = layers.fc(input=Fk, size=1, act=None)
scores = layers.sequence_softmax(input=logits)
attn_ctx = layers.elementwise_mul(x=ctx, y=scores, axis=0)
attn_ctx = layers.sequence_pool(input=attn_ctx, pool_type='sum')
hidden_t, cell_t = lstm_step(attn_ctx, hidden_t_prev=m_prev1, cell_t_prev=c_prev, size=decoder_size)
drnn.update_memory(ex_mem=m_prev, new_mem=hidden_t)
drnn.update_memory(ex_mem=c_prev, new_mem=cell_t)
drnn.output(scores)
beta = drnn()
return beta
def exp_sequence_expand():
# x = fluid.data(name='x', shape=[1], dtype='float32')
# y = fluid.data(name='y', shape=[1], dtype='float32', lod_level=1)
# out = layers.sequence_expand(x=x, y=y, ref_level=0)
x = fluid.data(name='x', shape=[4, 1], dtype='float32')
y = fluid.data(name='y', shape=[8, 1], dtype='float32', lod_level=1)
out = layers.sequence_expand(x=x, y=y, ref_level=0)
place = fluid.CPUPlace()
exe = fluid.Executor(place)
np_data = np.array([[1], [2], [3], [4]]).astype('float32')
x_lod_tensor = fluid.create_lod_tensor(np_data, [[2, 2]], place)
print(x_lod_tensor)
y_lod_tensor = fluid.create_random_int_lodtensor([[2, 2], [3, 3, 1, 1]], [1],
place, low=0, high=1)
y_lod_tensor2 = fluid.create_random_int_lodtensor([[2, 2], [3, 3, 1, 1]], [9, 16], place, low=0, high=1)
print(y_lod_tensor)
print(y_lod_tensor2)
# lod: [[0, 2, 4][0, 3, 6, 7, 8]]
# dim: 8, 1
# layout: NCHW
# dtype: int64_t
# data: [0 0 1 1 1 1 1 0]
out_main = exe.run(fluid.default_main_program(),
feed={'x': x_lod_tensor, 'y': y_lod_tensor},
fetch_list=[out], return_numpy=False)
print(out_main[0])
def test_sequence_expand(self):
program = Program()
with program_guard(program):
x = layers.data(name='x', shape=[10], dtype='float32')
y = layers.data(
name='y', shape=[10, 20], dtype='float32', lod_level=2)
self.assertIsNotNone(layers.sequence_expand(x=x, y=y, ref_level=1))
print(str(program))
def test_sequence_expand(self):
program = Program()
with program_guard(program):
x = layers.data(name='x', shape=[10], dtype='float32')
y = layers.data(
name='y', shape=[10, 20], dtype='float32', lod_level=2)
self.assertIsNotNone(layers.sequence_expand(x=x, y=y, ref_level=1))
print(str(program))
def static_rnn(step,
p_vec=p_vec,
init_state=None,
para_name='',
args=args):
tag = para_name + "static_rnn_"
ctx = layers.fc(
input=p_vec,
param_attr=fluid.ParamAttr(name=tag + 'context_fc_w'),
bias_attr=fluid.ParamAttr(name=tag + 'context_fc_b'),
size=hidden_size,
act=None)
beta = []
c_prev = init_state
m_prev = init_state
for i in range(step):
m_prev0 = layers.fc(
input=m_prev,
size=hidden_size,
act=None,
param_attr=fluid.ParamAttr(name=tag + 'm_prev0_fc_w'),
bias_attr=fluid.ParamAttr(name=tag + 'm_prev0_fc_b'))
m_prev1 = layers.sequence_expand(x=m_prev0, y=ctx)
Fk = ctx + m_prev1
Fk = layers.tanh(Fk)
logits = layers.fc(
input=Fk,
size=1,
act=None,
param_attr=fluid.ParamAttr(name=tag + 'logits_fc_w'),
bias_attr=fluid.ParamAttr(name=tag + 'logits_fc_b'))
scores = layers.sequence_softmax(input=logits)
attn_ctx = layers.elementwise_mul(x=p_vec, y=scores, axis=0)
attn_ctx = layers.sequence_pool(input=attn_ctx, pool_type='sum')
hidden_t, cell_t = lstm_step(
attn_ctx,
hidden_t_prev=m_prev,
cell_t_prev=c_prev,
size=hidden_size,
para_name=tag,
args=args)
m_prev = hidden_t
c_prev = cell_t
beta.append(scores)
return beta
def simple_attention(self, encoder_vec, encoder_proj, decoder_state,
decoder_size):
decoder_state_proj = layers.fc(input=decoder_state,
size=decoder_size,
bias_attr=False,
name="decoder_state_proj_fc")
decoder_state_expand = layers.sequence_expand(
x=decoder_state_proj, y=encoder_proj)
concated = layers.elementwise_add(encoder_proj, decoder_state_expand)
concated = layers.tanh(x=concated)
attention_weights = layers.fc(input=concated,
size=1,
act=None,
bias_attr=False,
name="attention_weights_fc")
attention_weights = layers.sequence_softmax(input=attention_weights)
weigths_reshape = layers.reshape(x=attention_weights, shape=[-1])
scaled = layers.elementwise_mul(
x=encoder_vec, y=weigths_reshape, axis=0)
context = layers.sequence_pool(input=scaled, pool_type='sum')
return context
def decoder_decode(context, is_sparse):
init_state = context
array_len = pd.fill_constant(shape=[1], dtype='int64', value=max_length)
counter = pd.zeros(shape=[1], dtype='int64', force_cpu=True)
# fill the first element with init_state
state_array = pd.create_array('float32')
pd.array_write(init_state, array=state_array, i=counter)
# ids, scores as memory
ids_array = pd.create_array('int64')
scores_array = pd.create_array('float32')
init_ids = pd.data(name="init_ids", shape=[1], dtype="int64", lod_level=2)
init_scores = pd.data(name="init_scores",
shape=[1],
dtype="float32",
lod_level=2)
pd.array_write(init_ids, array=ids_array, i=counter)
pd.array_write(init_scores, array=scores_array, i=counter)
cond = pd.less_than(x=counter, y=array_len)
while_op = pd.While(cond=cond)
with while_op.block():
pre_ids = pd.array_read(array=ids_array, i=counter)
pre_state = pd.array_read(array=state_array, i=counter)
pre_score = pd.array_read(array=scores_array, i=counter)
# expand the lod of pre_state to be the same with pre_score
pre_state_expanded = pd.sequence_expand(pre_state, pre_score)
pre_ids_emb = pd.embedding(input=pre_ids,
size=[dict_size, word_dim],
dtype='float32',
is_sparse=is_sparse)
# use rnn unit to update rnn
current_state = pd.fc(input=[pre_state_expanded, pre_ids_emb],
size=decoder_size,
act='tanh')
current_state_with_lod = pd.lod_reset(x=current_state, y=pre_score)
# use score to do beam search
current_score = pd.fc(input=current_state_with_lod,
size=target_dict_dim,
act='softmax')
topk_scores, topk_indices = pd.topk(current_score, k=50)
selected_ids, selected_scores = pd.beam_search(pre_ids,
topk_indices,
topk_scores,
beam_size,
end_id=10,
level=0)
pd.increment(x=counter, value=1, in_place=True)
# update the memories
pd.array_write(current_state, array=state_array, i=counter)
pd.array_write(selected_ids, array=ids_array, i=counter)
pd.array_write(selected_scores, array=scores_array, i=counter)
pd.less_than(x=counter, y=array_len, cond=cond)
translation_ids, translation_scores = pd.beam_search_decode(
ids=ids_array, scores=scores_array)
# return init_ids, init_scores
return translation_ids, translation_scores
def decoder_decode(context, is_sparse):
init_state = context
array_len = pd.fill_constant(shape=[1], dtype='int64', value=max_length)
counter = pd.zeros(shape=[1], dtype='int64', force_cpu=True)
# fill the first element with init_state
state_array = pd.create_array('float32')
pd.array_write(init_state, array=state_array, i=counter)
# ids, scores as memory
ids_array = pd.create_array('int64')
scores_array = pd.create_array('float32')
init_ids = pd.data(name="init_ids", shape=[1], dtype="int64", lod_level=2)
init_scores = pd.data(
name="init_scores", shape=[1], dtype="float32", lod_level=2)
pd.array_write(init_ids, array=ids_array, i=counter)
pd.array_write(init_scores, array=scores_array, i=counter)
cond = pd.less_than(x=counter, y=array_len)
while_op = pd.While(cond=cond)
with while_op.block():
pre_ids = pd.array_read(array=ids_array, i=counter)
pre_state = pd.array_read(array=state_array, i=counter)
pre_score = pd.array_read(array=scores_array, i=counter)
# expand the recursive_sequence_lengths of pre_state to be the same with pre_score
pre_state_expanded = pd.sequence_expand(pre_state, pre_score)
pre_ids_emb = pd.embedding(
input=pre_ids,
size=[dict_size, word_dim],
dtype='float32',
is_sparse=is_sparse)
# use rnn unit to update rnn
current_state = pd.fc(input=[pre_state_expanded, pre_ids_emb],
size=decoder_size,
act='tanh')
current_state_with_lod = pd.lod_reset(x=current_state, y=pre_score)
# use score to do beam search
current_score = pd.fc(input=current_state_with_lod,
size=target_dict_dim,
act='softmax')
topk_scores, topk_indices = pd.topk(current_score, k=beam_size)
# calculate accumulated scores after topk to reduce computation cost
accu_scores = pd.elementwise_add(
x=pd.log(topk_scores), y=pd.reshape(
pre_score, shape=[-1]), axis=0)
selected_ids, selected_scores = pd.beam_search(
pre_ids,
pre_score,
topk_indices,
accu_scores,
beam_size,
end_id=10,
level=0)
pd.increment(x=counter, value=1, in_place=True)
# update the memories
pd.array_write(current_state, array=state_array, i=counter)
pd.array_write(selected_ids, array=ids_array, i=counter)
pd.array_write(selected_scores, array=scores_array, i=counter)
# update the break condition: up to the max length or all candidates of
# source sentences have ended.
length_cond = pd.less_than(x=counter, y=array_len)
finish_cond = pd.logical_not(pd.is_empty(x=selected_ids))
pd.logical_and(x=length_cond, y=finish_cond, out=cond)
translation_ids, translation_scores = pd.beam_search_decode(
ids=ids_array, scores=scores_array, beam_size=beam_size, end_id=10)
# return init_ids, init_scores
return translation_ids, translation_scores
def beam_search():
max_len = layers.fill_constant(
shape=[1], dtype=start_tokens.dtype, value=max_out_len)
step_idx = layers.fill_constant(
shape=[1], dtype=start_tokens.dtype, value=0)
cond = layers.less_than(x=step_idx, y=max_len)
while_op = layers.While(cond)
# array states will be stored for each step.
ids = layers.array_write(start_tokens, step_idx)
scores = layers.array_write(init_scores, step_idx)
# cell states will be overwrited at each step.
# caches contains states of history steps to reduce redundant
# computation in decoder.
caches = [{
"k": layers.fill_constant_batch_size_like(
input=start_tokens,
shape=[-1, 0, d_model],
dtype=enc_output.dtype,
value=0),
"v": layers.fill_constant_batch_size_like(
input=start_tokens,
shape=[-1, 0, d_model],
dtype=enc_output.dtype,
value=0)
} for i in range(n_layer)]
with while_op.block():
pre_ids = layers.array_read(array=ids, i=step_idx)
pre_scores = layers.array_read(array=scores, i=step_idx)
# sequence_expand can gather sequences according to lod thus can be
# used in beam search to sift states corresponding to selected ids.
pre_src_attn_bias = layers.sequence_expand(
x=trg_src_attn_bias, y=pre_scores)
pre_enc_output = layers.sequence_expand(x=enc_output, y=pre_scores)
pre_caches = [{
"k": layers.sequence_expand(
x=cache["k"], y=pre_scores),
"v": layers.sequence_expand(
x=cache["v"], y=pre_scores),
} for cache in caches]
pre_pos = layers.elementwise_mul(
x=layers.fill_constant_batch_size_like(
input=pre_enc_output, # cann't use pre_ids here since it has lod
value=1,
shape=[-1, 1],
dtype=pre_ids.dtype),
y=layers.increment(
x=step_idx, value=1.0, in_place=False),
axis=0)
logits = wrap_decoder(
trg_vocab_size,
max_in_len,
n_layer,
n_head,
d_key,
d_value,
d_model,
d_inner_hid,
dropout_rate,
weight_sharing,
dec_inputs=(
pre_ids, pre_pos, None, pre_src_attn_bias, trg_data_shape,
slf_attn_pre_softmax_shape, slf_attn_post_softmax_shape,
src_attn_pre_softmax_shape, src_attn_post_softmax_shape),
enc_output=pre_enc_output,
caches=pre_caches)
topk_scores, topk_indices = layers.topk(
input=layers.softmax(logits), k=beam_size)
accu_scores = layers.elementwise_add(
x=layers.log(topk_scores),
y=layers.reshape(
pre_scores, shape=[-1]),
axis=0)
# beam_search op uses lod to distinguish branches.
topk_indices = layers.lod_reset(topk_indices, pre_ids)
selected_ids, selected_scores = layers.beam_search(
pre_ids=pre_ids,
pre_scores=pre_scores,
ids=topk_indices,
scores=accu_scores,
beam_size=beam_size,
end_id=eos_idx)
layers.increment(x=step_idx, value=1.0, in_place=True)
# update states
layers.array_write(selected_ids, i=step_idx, array=ids)
layers.array_write(selected_scores, i=step_idx, array=scores)
layers.assign(pre_src_attn_bias, trg_src_attn_bias)
layers.assign(pre_enc_output, enc_output)
for i in range(n_layer):
layers.assign(pre_caches[i]["k"], caches[i]["k"])
layers.assign(pre_caches[i]["v"], caches[i]["v"])
layers.assign(
layers.elementwise_add(
x=slf_attn_pre_softmax_shape,
y=attn_pre_softmax_shape_delta),
slf_attn_pre_softmax_shape)
layers.assign(
layers.elementwise_add(
x=slf_attn_post_softmax_shape,
y=attn_post_softmax_shape_delta),
slf_attn_post_softmax_shape)
length_cond = layers.less_than(x=step_idx, y=max_len)
finish_cond = layers.logical_not(layers.is_empty(x=selected_ids))
layers.logical_and(x=length_cond, y=finish_cond, out=cond)
finished_ids, finished_scores = layers.beam_search_decode(
ids, scores, beam_size=beam_size, end_id=eos_idx)
return finished_ids, finished_scores
def gru_attention_infer(self, decoder_boot, max_length, char_num,
word_vector_dim, encoded_vector, encoded_proj,
decoder_size):
init_state = decoder_boot
beam_size = 1
array_len = layers.fill_constant(
shape=[1], dtype='int64', value=max_length)
counter = layers.zeros(shape=[1], dtype='int64', force_cpu=True)
# fill the first element with init_state
state_array = layers.create_array('float32')
layers.array_write(init_state, array=state_array, i=counter)
# ids, scores as memory
ids_array = layers.create_array('int64')
scores_array = layers.create_array('float32')
rois_shape = layers.shape(init_state)
batch_size = layers.slice(
rois_shape, axes=[0], starts=[0], ends=[1]) + 1
lod_level = layers.range(
start=0, end=batch_size, step=1, dtype=batch_size.dtype)
init_ids = layers.fill_constant_batch_size_like(
input=init_state, shape=[-1, 1], value=0, dtype='int64')
init_ids = layers.lod_reset(init_ids, lod_level)
init_ids = layers.lod_append(init_ids, lod_level)
init_scores = layers.fill_constant_batch_size_like(
input=init_state, shape=[-1, 1], value=1, dtype='float32')
init_scores = layers.lod_reset(init_scores, init_ids)
layers.array_write(init_ids, array=ids_array, i=counter)
layers.array_write(init_scores, array=scores_array, i=counter)
full_ids = fluid.layers.fill_constant_batch_size_like(
input=init_state, shape=[-1, 1], dtype='int64', value=1)
cond = layers.less_than(x=counter, y=array_len)
while_op = layers.While(cond=cond)
with while_op.block():
pre_ids = layers.array_read(array=ids_array, i=counter)
pre_state = layers.array_read(array=state_array, i=counter)
pre_score = layers.array_read(array=scores_array, i=counter)
pre_ids_emb = layers.embedding(
input=pre_ids,
size=[char_num, word_vector_dim],
dtype='float32')
context = self.simple_attention(encoded_vector, encoded_proj,
pre_state, decoder_size)
# expand the recursive_sequence_lengths of pre_state
# to be the same with pre_score
pre_state_expanded = layers.sequence_expand(pre_state, pre_score)
context_expanded = layers.sequence_expand(context, pre_score)
fc_1 = layers.fc(input=context_expanded,
size=decoder_size * 3,
bias_attr=False,
name="rnn_fc1")
fc_2 = layers.fc(input=pre_ids_emb,
size=decoder_size * 3,
bias_attr=False,
name="rnn_fc2")
decoder_inputs = fc_1 + fc_2
current_state, _, _ = layers.gru_unit(
input=decoder_inputs,
hidden=pre_state_expanded,
size=decoder_size * 3)
current_state_with_lod = layers.lod_reset(
x=current_state, y=pre_score)
# use score to do beam search
current_score = layers.fc(input=current_state_with_lod,
size=char_num,
bias_attr=True,
act='softmax',
name="rnn_out_fc")
topk_scores, topk_indices = layers.topk(current_score, k=beam_size)
new_ids = fluid.layers.concat([full_ids, topk_indices], axis=1)
fluid.layers.assign(new_ids, full_ids)
layers.increment(x=counter, value=1, in_place=True)
# update the memories
layers.array_write(current_state, array=state_array, i=counter)
layers.array_write(topk_indices, array=ids_array, i=counter)
layers.array_write(topk_scores, array=scores_array, i=counter)
# update the break condition:
# up to the max length or all candidates of
# source sentences have ended.
length_cond = layers.less_than(x=counter, y=array_len)
finish_cond = layers.logical_not(layers.is_empty(x=topk_indices))
layers.logical_and(x=length_cond, y=finish_cond, out=cond)
return full_ids
def attn_flow(q_enc, p_enc, p_ids_name):
tag = p_ids_name + "::"
drnn = layers.DynamicRNN()
with drnn.block():
h_cur = drnn.step_input(p_enc)
u_all = drnn.static_input(q_enc)
h_expd = layers.sequence_expand(x=h_cur, y=u_all)
s_t_ = layers.elementwise_mul(x=u_all, y=h_expd, axis=0)
s_t1 = layers.reduce_sum(input=s_t_, dim=1)
s_t = layers.sequence_softmax(input=s_t1)
u_expr = layers.elementwise_mul(x=u_all, y=s_t, axis=0)
u_expr = layers.sequence_pool(input=u_expr, pool_type='sum')
if args.debug == True:
'''
layers.Print(h_expd, message='h_expd')
layers.Print(h_cur, message='h_cur')
layers.Print(u_all, message='u_all')
layers.Print(s_t, message='s_t')
layers.Print(s_t_, message='s_t_')
layers.Print(u_expr, message='u_expr')
'''
drnn.output(u_expr)
U_expr = drnn()
#'''
drnn2 = layers.DynamicRNN()
with drnn2.block():
h_cur = drnn2.step_input(p_enc)
u_all = drnn2.static_input(q_enc)
h_expd = layers.sequence_expand(x=h_cur, y=u_all)
s_t_ = layers.elementwise_mul(x=u_all, y=h_expd, axis=0)
s_t2 = layers.reduce_sum(input=s_t_, dim=1, keep_dim=True)
b_t = layers.sequence_pool(input=s_t2, pool_type='max')
if args.debug == True:
'''
layers.Print(s_t2, message='s_t2')
layers.Print(b_t, message='b_t')
'''
drnn2.output(b_t)
b = drnn2()
b_norm = layers.sequence_softmax(input=b)
h_expr = layers.elementwise_mul(x=p_enc, y=b_norm, axis=0)
h_expr = layers.sequence_pool(input=h_expr, pool_type='sum')
H_expr = layers.sequence_expand(x=h_expr, y=p_enc)
H_expr = layers.lod_reset(x=H_expr, y=p_enc)
h_u = layers.elementwise_mul(x=H_expr, y=U_expr, axis=0)
h_h = layers.elementwise_mul(x=H_expr, y=p_enc, axis=0)
g = layers.concat(input=[H_expr, U_expr, h_u, h_h], axis = 1)
#fusion
m = bi_lstm_encoder(input_seq=g, gate_size=embedding_dim)
if args.debug == True:
layers.Print(U_expr, message=tag + 'U_expr')
layers.Print(H_expr, message=tag + 'H_expr')
layers.Print(b, message=tag + 'b')
layers.Print(b_norm, message=tag + 'b_norm')
layers.Print(g, message=tag +'g')
layers.Print(m, message=tag + 'm')
layers.Print(h_h, message=tag + 'h_h')
layers.Print(q_enc, message=tag + 'q_enc')
layers.Print(p_enc, message=tag + 'p_enc')
return m, g
def point_network_decoder(p_vec, q_vec, decoder_size):
random_attn = layers.gaussian_random(shape=[1, decoder_size])
random_attn = layers.sequence_expand(x=random_attn, y=q_vec)
random_attn = layers.fc(input=random_attn, size=decoder_size, act=None)
U = layers.fc(input=q_vec,
size=decoder_size,
act=None) + random_attn
U = layers.tanh(U)
logits = layers.fc(input=U,
size=1,
act=None)
scores = layers.sequence_softmax(input=logits)
pooled_vec = layers.elementwise_mul(x=q_vec, y=scores, axis=0)
pooled_vec = layers.sequence_pool(input=pooled_vec, pool_type='sum')
init_state = layers.fc(input=pooled_vec,
size=decoder_size,
act=None)
def custom_dynamic_rnn(p_vec, init_state, decoder_size):
context = layers.fc(input=p_vec,
size=decoder_size,
act=None)
drnn = layers.DynamicRNN()
with drnn.block():
H_s = drnn.step_input(p_vec)
ctx = drnn.static_input(context)
c_prev = drnn.memory(init=init_state, need_reorder=True)
m_prev = drnn.memory(init=init_state, need_reorder=True)
m_prev1 = layers.fc(input=m_prev, size=decoder_size, act=None)
m_prev1 = layers.sequence_expand(x=m_prev1, y=ctx)
Fk = ctx + m_prev1
Fk = layers.fc(input=Fk, size=decoder_size, act='tanh')
logits = layers.fc(input=Fk, size=1, act=None)
scores = layers.sequence_softmax(input=logits)
attn_ctx = layers.elementwise_mul(x=ctx, y=scores, axis=0)
attn_ctx = layers.sequence_pool(input=attn_ctx, pool_type='sum')
hidden_t, cell_t = lstm_step(attn_ctx, hidden_t_prev=m_prev1, cell_t_prev=c_prev, size=decoder_size)
drnn.update_memory(ex_mem=m_prev, new_mem=hidden_t)
drnn.update_memory(ex_mem=c_prev, new_mem=cell_t)
drnn.output(scores)
beta = drnn()
return beta
fw_outputs = custom_dynamic_rnn(p_vec, init_state, decoder_size)
bw_outputs = custom_dynamic_rnn(p_vec, init_state, decoder_size)
def sequence_slice(x, index):
#offset = layers.fill_constant(shape=[1, args.batch_size], value=index, dtype='float32')
#length = layers.fill_constant(shape=[1, args.batch_size], value=1, dtype='float32')
#return layers.sequence_slice(x, offset, length)
idx = layers.fill_constant(shape=[1], value=1, dtype='int32')
idx.stop_gradient = True
from paddle.fluid.layers.control_flow import lod_rank_table
from paddle.fluid.layers.control_flow import lod_tensor_to_array
from paddle.fluid.layers.control_flow import array_read
from paddle.fluid.layers.control_flow import array_to_lod_tensor
table = lod_rank_table(x, level=0)
table.stop_gradient = True
array = lod_tensor_to_array(x, table)
slice_array = array_read(array=array, i=idx)
return array_to_lod_tensor(slice_array, table)
start_prob = layers.elementwise_mul(x=sequence_slice(fw_outputs, 0), y=sequence_slice(bw_outputs, 1), axis=0) / 2
end_prob = layers.elementwise_mul(x=sequence_slice(fw_outputs, 1), y=sequence_slice(bw_outputs, 0), axis=0) / 2
return start_prob, end_prob
def decode(context, is_sparse):
init_state = context
array_len = pd.fill_constant(shape=[1], dtype='int64', value=max_length)
counter = pd.zeros(shape=[1], dtype='int64', force_cpu=True)
# fill the first element with init_state
state_array = pd.create_array('float32')
pd.array_write(init_state, array=state_array, i=counter)
# ids, scores as memory
ids_array = pd.create_array('int64')
scores_array = pd.create_array('float32')
init_ids = pd.data(name="init_ids", shape=[1], dtype="int64", lod_level=2)
init_scores = pd.data(
name="init_scores", shape=[1], dtype="float32", lod_level=2)
pd.array_write(init_ids, array=ids_array, i=counter)
pd.array_write(init_scores, array=scores_array, i=counter)
cond = pd.less_than(x=counter, y=array_len)
while_op = pd.While(cond=cond)
with while_op.block():
pre_ids = pd.array_read(array=ids_array, i=counter)
pre_state = pd.array_read(array=state_array, i=counter)
pre_score = pd.array_read(array=scores_array, i=counter)
# expand the lod of pre_state to be the same with pre_score
pre_state_expanded = pd.sequence_expand(pre_state, pre_score)
pre_ids_emb = pd.embedding(
input=pre_ids,
size=[dict_size, word_dim],
dtype='float32',
is_sparse=is_sparse)
# use rnn unit to update rnn
current_state = pd.fc(input=[pre_state_expanded, pre_ids_emb],
size=decoder_size,
act='tanh')
current_state_with_lod = pd.lod_reset(x=current_state, y=pre_score)
# use score to do beam search
current_score = pd.fc(input=current_state_with_lod,
size=target_dict_dim,
act='softmax')
topk_scores, topk_indices = pd.topk(current_score, k=topk_size)
selected_ids, selected_scores = pd.beam_search(
pre_ids, topk_indices, topk_scores, beam_size, end_id=10, level=0)
pd.increment(x=counter, value=1, in_place=True)
# update the memories
pd.array_write(current_state, array=state_array, i=counter)
pd.array_write(selected_ids, array=ids_array, i=counter)
pd.array_write(selected_scores, array=scores_array, i=counter)
pd.less_than(x=counter, y=array_len, cond=cond)
translation_ids, translation_scores = pd.beam_search_decode(
ids=ids_array, scores=scores_array)
# return init_ids, init_scores
return translation_ids, translation_scores
