def _to_tensor(self, *args):
"""
Argument convert args to Tensor
Args:
value (float, list, numpy.ndarray, Tensor)
Returns:
Tensor of args.
"""
numpy_args = []
variable_args = []
tmp = 0.
for arg in args:
if isinstance(arg, float):
arg = [arg]
if not isinstance(arg, (list, tuple, np.ndarray, tensor.Variable)):
raise TypeError(
"Type of input args must be float, list, numpy.ndarray or Tensor, but received type {}".
format(type(arg)))
arg_np = np.array(arg)
arg_dtype = arg_np.dtype
if str(arg_dtype) != 'float32':
if str(arg_dtype) != 'float64':
# "assign" op doesn't support float64. if dtype is float64, float32 variable will be generated
# and converted to float64 later using "cast".
warnings.warn(
"data type of argument only support float32 and float64, your argument will be convert to float32."
)
arg_np = arg_np.astype('float32')
# tmp is used to support broadcast, it summarizes shapes of all the args and get the mixed shape.
tmp = tmp + arg_np
numpy_args.append(arg_np)
dtype = tmp.dtype
for arg in numpy_args:
arg_broadcasted, _ = np.broadcast_arrays(arg, tmp)
arg_variable = tensor.create_tensor(dtype=dtype)
tensor.assign(arg_broadcasted, arg_variable)
variable_args.append(arg_variable)
return tuple(variable_args)
def lr_warmup(learning_rate, warmup_steps, total_step, multiplier,
step_each_epoch):
with default_main_program()._lr_schedule_guard():
lr = tensor.create_global_var(shape=[1],
value=0.0,
dtype='float32',
persistable=True,
name='learning_rate_warmup')
global_step = _decay_step_counter()
with control_flow.Switch() as switch:
with switch.case(global_step <= warmup_steps):
decay_lr = learning_rate * (
(multiplier - 1.) * global_step / warmup_steps + 1.)
tensor.assign(decay_lr, lr)
with switch.default():
learning_rate = learning_rate * multiplier
#cur_epoch = ops.floor(global_step/step_each_epoch)
decay_lr = learning_rate * 0.5 * (ops.cos(
(global_step - warmup_steps) * math.pi / (total_step)) + 1)
tensor.assign(decay_lr, lr)
return lr
def _lf_embedder(self, tokens, token_lens=None):
"""lf embedder.
Args:
tokens (Variable): [batch_size, seq_len]
token_lens (Variable): Default is None.
Returns: TODO
Raises: NULL
"""
self._batch_size = layers.shape(self.question_encoding)[0]
## Grammar Rule Embedding
self._grammar_vocab = tensor.cast(tensor.assign(
self.grammar.gmr_vocab.astype(np.int32)),
dtype='int64')
self._grammar_emb = fluid.embedding(
input=self._grammar_vocab,
size=[self.grammar.grammar_size, self.lf_emb_size],
dtype='float32',
is_sparse=False,
param_attr=fluid.ParamAttr(name="lf_embedding",
initializer=nn_utils.uniform(
self.init_scale)))
batch_emb_lookup_grammar = layers.expand(
layers.unsqueeze(self._grammar_emb, [0]), [self._batch_size, 1, 1])
def _table_to_lf_input(ori_encoding):
"""trans ori_encoding to size of lf_embedding
"""
output = layers.fc(input=ori_encoding,
size=self.lf_emb_size,
num_flatten_dims=2,
**nn_utils.param_attr('fc_table2lf_input',
self.init_scale,
need_bias=False))
return output
batch_emb_lookup_all = tensor.concat([
batch_emb_lookup_grammar,
_table_to_lf_input(self.tname_encoding),
_table_to_lf_input(self.cname_encoding),
_table_to_lf_input(self.value_encoding)
],
axis=1)
lf_embedding = nn_utils.batch_gather_2d(batch_emb_lookup_all, tokens)
## Grammar Rule 类型 Embedding
self._grammar2name = layers.cast(layers.assign(
self.grammar.gmr2name_arr.astype(np.int32)),
dtype='int64')
lf_name = layers.reshape(layers.gather(
self._grammar2name, layers.reshape(tokens, shape=[-1])),
shape=tokens.shape)
lf_name.stop_gradient = True
lf_name_emb = fluid.embedding(
input=lf_name,
size=[self.grammar.name_size, self.lf_name_emb_size],
dtype='float32',
is_sparse=False,
param_attr=fluid.ParamAttr(name="lf_name_embedding",
initializer=nn_utils.uniform(
self.init_scale)))
output = layers.concat([lf_embedding, lf_name_emb], axis=-1)
if token_lens is not None:
mask = layers.sequence_mask(token_lens,
maxlen=layers.shape(tokens)[1],
dtype='float32')
output = layers.elementwise_mul(output, mask, axis=0)
return output
def decode_with_grammar(decoder, inits, decode_vocab, max_step_num, **kwargs):
"""A modification of paddle.fluid.layers.dynamic_decode(...).
Dynamic decoding performs :code:`decoder.step()` repeatedly until the returned
Tensor indicating finished status contains all True values or the number of
decoding step reachs to :attr:`max_step_num`.
:code:`decoder.initialize()` would be called once before the decoding loop.
If the `decoder` has implemented `finalize` method, :code:`decoder.finalize()`
would be called once after the decoding loop.
Args:
decoder(Decoder): An instance of `Decoder`.
inits(tuple): Argument passed to `decoder.initialize`.
decode_vocab(DecoderDynamicVocab): namedtuple(table table_len column column_len value value_len)
max_step_num(int): The maximum number of steps.
**kwargs: Additional keyword arguments. Arguments passed to `decoder.step`.
Returns:
tuple: A tuple( :code:`(final_outputs, final_states)` ) including the final \
outputs and states, both are Tensor or nested structure of Tensor. \
`final_outputs` has the same structure and data types as \
:code:`decoder.output_dtype` , and each Tenser in `final_outputs` \
is the stacked of all decoding steps' outputs, which might be revised \
by :code:`decoder.finalize` . `final_states` is the counterpart \
at last time step of initial states returned by :code:`decoder.initialize` , \
thus has the same structure with it and has tensors with same shapes \
and data types.
"""
step_cnt = tensor.fill_constant(shape=[1], dtype="int64", value=1)
max_step_num_tensor = tensor.fill_constant(shape=[1],
dtype="int64",
value=max_step_num - 2)
# shape = [batch_size, beam_size, ...]
initial_inputs, initial_states, initial_finished = decoder.initialize(
inits, decode_vocab)
global_inputs, global_states, global_finished = (initial_inputs,
initial_states,
initial_finished)
inputs = initial_inputs
states = initial_states
# 保存输出结果
outputs_arr_data = tensor.fill_constant_batch_size_like(
inputs.input,
shape=[-1, decoder.beam_size, max_step_num],
dtype=decoder.output_dtype.predicted_ids,
value=0)
outputs_arr_pos = tensor.fill_constant_batch_size_like(
inputs.input, shape=[-1, decoder.beam_size, 1], dtype='int64', value=0)
outputs_array = data_structure.ArrayData(
decoder.merge_batch_beams(outputs_arr_data),
decoder.merge_batch_beams(outputs_arr_pos))
sequence_lengths = tensor.cast(tensor.zeros_like(initial_finished),
"int64")
# 按语法解码的相关约束数据结构
grammar_stack_dat = tensor.fill_constant_batch_size_like(
inputs.input,
shape=[-1, decoder.beam_size, max_step_num * STACK_EXPAND_TIMES],
dtype='int64',
value=0)
grammar_stack_pos = tensor.fill_constant_batch_size_like(
inputs.input, shape=[-1, decoder.beam_size, 1], dtype='int64', value=0)
grammar_stack = data_structure.StackData(
decoder.merge_batch_beams(grammar_stack_dat),
decoder.merge_batch_beams(grammar_stack_pos))
############ 循环解码，直到全部为 finish 状态 ############
# finish 的判断：通过 global_finished/next_finished && max_step_num 判断
cond = layers.logical_not((layers.reduce_all(initial_finished)))
while_op = layers.While(cond)
with while_op.block():
# step_outputs --> OutputWrapper
# next_states --> StateWrapper
# next_inputs --> DecoderInputsWrapper
step_outputs, next_states, next_inputs = decoder.step(
inputs, states, **kwargs)
predicted_ids = step_outputs.predicted_ids
_save_predict_output(outputs_array, predicted_ids,
next_states.finished)
pred_gmr_type = decoder.grammar_type(predicted_ids)
cond_type_leaf = layers.equal(pred_gmr_type, decoder.GMR_TYPE.LEAF)
cond_type_midd = layers.equal(pred_gmr_type, decoder.GMR_TYPE.MID)
_process_type_leaf(cond_type_leaf, decoder, grammar_stack, next_inputs,
next_states.finished)
_process_type_midd(cond_type_midd, decoder, grammar_stack, next_inputs,
predicted_ids)
##next_sequence_lengths = layers.elementwise_add(sequence_lengths,
## tensor.cast(layers.logical_not(global_finished), sequence_lengths.dtype))
_check_finished(decoder, next_inputs, next_states.finished,
outputs_array)
layers.utils.map_structure(tensor.assign, next_inputs, global_inputs)
layers.utils.map_structure(tensor.assign, next_states, global_states)
tensor.assign(next_states.finished, global_finished)
##tensor.assign(next_sequence_lengths, sequence_lengths)
# 更新循环条件
layers.increment(x=step_cnt, value=1.0, in_place=True)
layers.logical_and(
layers.logical_not(layers.reduce_all(next_states.finished)),
layers.less_equal(step_cnt, max_step_num_tensor), cond)
final_outputs = outputs_array.data
final_states = global_states
final_outputs, final_states = decoder.finalize(final_outputs,
global_states,
sequence_lengths)
return final_outputs, final_states
