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192 lines
7.0 KiB
192 lines
7.0 KiB
# edit-mode: -*- python -*-
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# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import sys
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import os
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from paddle.trainer_config_helpers import *
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def seq_to_seq_data(data_dir,
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is_generating,
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dict_size=30000,
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train_list='train.list',
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test_list='test.list',
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gen_list='gen.list',
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gen_result='gen_result'):
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"""
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Predefined seqToseq train data provider for application
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is_generating: whether this config is used for generating
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dict_size: word count of dictionary
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train_list: a text file containing a list of training data
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test_list: a text file containing a list of testing data
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gen_list: a text file containing a list of generating data
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gen_result: a text file containing generating result
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"""
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src_lang_dict = os.path.join(data_dir, 'src.dict')
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trg_lang_dict = os.path.join(data_dir, 'trg.dict')
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if is_generating:
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train_list = None
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test_list = os.path.join(data_dir, gen_list)
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else:
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train_list = os.path.join(data_dir, train_list)
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test_list = os.path.join(data_dir, test_list)
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define_py_data_sources2(
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train_list,
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test_list,
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module="dataprovider",
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obj="process",
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args={
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"src_dict_path": src_lang_dict,
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"trg_dict_path": trg_lang_dict,
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"is_generating": is_generating
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})
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return {
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"src_dict_path": src_lang_dict,
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"trg_dict_path": trg_lang_dict,
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"gen_result": gen_result
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}
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def gru_encoder_decoder(data_conf,
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is_generating,
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word_vector_dim=512,
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encoder_size=512,
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decoder_size=512,
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beam_size=3,
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max_length=250):
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"""
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A wrapper for an attention version of GRU Encoder-Decoder network
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is_generating: whether this config is used for generating
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encoder_size: dimension of hidden unit in GRU Encoder network
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decoder_size: dimension of hidden unit in GRU Decoder network
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word_vector_dim: dimension of word vector
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beam_size: expand width in beam search
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max_length: a stop condition of sequence generation
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"""
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for k, v in data_conf.iteritems():
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globals()[k] = v
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source_dict_dim = len(open(src_dict_path, "r").readlines())
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target_dict_dim = len(open(trg_dict_path, "r").readlines())
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gen_trans_file = gen_result
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src_word_id = data_layer(name='source_language_word', size=source_dict_dim)
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src_embedding = embedding_layer(
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input=src_word_id,
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size=word_vector_dim,
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param_attr=ParamAttr(name='_source_language_embedding'))
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src_forward = simple_gru(input=src_embedding, size=encoder_size)
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src_backward = simple_gru(
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input=src_embedding, size=encoder_size, reverse=True)
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encoded_vector = concat_layer(input=[src_forward, src_backward])
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with mixed_layer(size=decoder_size) as encoded_proj:
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encoded_proj += full_matrix_projection(input=encoded_vector)
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backward_first = first_seq(input=src_backward)
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with mixed_layer(
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size=decoder_size,
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act=TanhActivation(), ) as decoder_boot:
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decoder_boot += full_matrix_projection(input=backward_first)
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def gru_decoder_with_attention(enc_vec, enc_proj, current_word):
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decoder_mem = memory(
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name='gru_decoder', size=decoder_size, boot_layer=decoder_boot)
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context = simple_attention(
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encoded_sequence=enc_vec,
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encoded_proj=enc_proj,
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decoder_state=decoder_mem, )
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with mixed_layer(size=decoder_size * 3) as decoder_inputs:
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decoder_inputs += full_matrix_projection(input=context)
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decoder_inputs += full_matrix_projection(input=current_word)
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gru_step = gru_step_layer(
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name='gru_decoder',
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input=decoder_inputs,
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output_mem=decoder_mem,
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size=decoder_size)
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with mixed_layer(
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size=target_dict_dim, bias_attr=True,
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act=SoftmaxActivation()) as out:
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out += full_matrix_projection(input=gru_step)
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return out
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decoder_group_name = "decoder_group"
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group_inputs = [
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StaticInput(
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input=encoded_vector, is_seq=True), StaticInput(
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input=encoded_proj, is_seq=True)
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]
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if not is_generating:
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trg_embedding = embedding_layer(
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input=data_layer(
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name='target_language_word', size=target_dict_dim),
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size=word_vector_dim,
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param_attr=ParamAttr(name='_target_language_embedding'))
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group_inputs.append(trg_embedding)
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# For decoder equipped with attention mechanism, in training,
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# target embeding (the groudtruth) is the data input,
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# while encoded source sequence is accessed to as an unbounded memory.
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# Here, the StaticInput defines a read-only memory
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# for the recurrent_group.
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decoder = recurrent_group(
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name=decoder_group_name,
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step=gru_decoder_with_attention,
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input=group_inputs)
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lbl = data_layer(name='target_language_next_word', size=target_dict_dim)
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cost = classification_cost(input=decoder, label=lbl)
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outputs(cost)
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else:
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# In generation, the decoder predicts a next target word based on
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# the encoded source sequence and the last generated target word.
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# The encoded source sequence (encoder's output) must be specified by
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# StaticInput, which is a read-only memory.
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# Embedding of the last generated word is automatically gotten by
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# GeneratedInputs, which is initialized by a start mark, such as <s>,
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# and must be included in generation.
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trg_embedding = GeneratedInput(
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size=target_dict_dim,
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embedding_name='_target_language_embedding',
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embedding_size=word_vector_dim)
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group_inputs.append(trg_embedding)
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beam_gen = beam_search(
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name=decoder_group_name,
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step=gru_decoder_with_attention,
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input=group_inputs,
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bos_id=0,
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eos_id=1,
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beam_size=beam_size,
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max_length=max_length)
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seqtext_printer_evaluator(
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input=beam_gen,
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id_input=data_layer(
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name="sent_id", size=1),
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dict_file=trg_dict_path,
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result_file=gen_trans_file)
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outputs(beam_gen)
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