qiaolongfei
8 years ago
parent
3780679203
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96a2e44aa3
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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 os
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from paddle.utils.preprocess_util import save_list, DatasetCreater
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class SeqToSeqDatasetCreater(DatasetCreater):
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"""
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A class to process data for sequence to sequence application.
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"""
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def __init__(self, data_path, output_path):
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"""
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data_path: the path to store the train data, test data and gen data
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output_path: the path to store the processed dataset
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"""
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DatasetCreater.__init__(self, data_path)
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self.gen_dir_name = 'gen'
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self.gen_list_name = 'gen.list'
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self.output_path = output_path
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def concat_file(self, file_path, file1, file2, output_path, output):
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"""
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Concat file1 and file2 to be one output file
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The i-th line of output = i-th line of file1 + '\t' + i-th line of file2
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file_path: the path to store file1 and file2
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output_path: the path to store output file
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"""
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file1 = os.path.join(file_path, file1)
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file2 = os.path.join(file_path, file2)
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output = os.path.join(output_path, output)
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if not os.path.exists(output):
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os.system('paste ' + file1 + ' ' + file2 + ' > ' + output)
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def cat_file(self, dir_path, suffix, output_path, output):
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"""
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Cat all the files in dir_path with suffix to be one output file
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dir_path: the base directory to store input file
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suffix: suffix of file name
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output_path: the path to store output file
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"""
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cmd = 'cat '
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file_list = os.listdir(dir_path)
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file_list.sort()
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for file in file_list:
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if file.endswith(suffix):
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cmd += os.path.join(dir_path, file) + ' '
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output = os.path.join(output_path, output)
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if not os.path.exists(output):
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os.system(cmd + '> ' + output)
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def build_dict(self, file_path, dict_path, dict_size=-1):
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"""
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Create the dictionary for the file, Note that
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1. Valid characters include all printable characters
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2. There is distinction between uppercase and lowercase letters
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3. There is 3 special token:
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<s>: the start of a sequence
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<e>: the end of a sequence
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<unk>: a word not included in dictionary
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file_path: the path to store file
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dict_path: the path to store dictionary
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dict_size: word count of dictionary
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if is -1, dictionary will contains all the words in file
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"""
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if not os.path.exists(dict_path):
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dictory = dict()
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with open(file_path, "r") as fdata:
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for line in fdata:
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line = line.split('\t')
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for line_split in line:
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words = line_split.strip().split()
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for word in words:
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if word not in dictory:
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dictory[word] = 1
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else:
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dictory[word] += 1
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output = open(dict_path, "w+")
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output.write('<s>\n<e>\n<unk>\n')
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count = 3
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for key, value in sorted(
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dictory.items(), key=lambda d: d[1], reverse=True):
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output.write(key + "\n")
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count += 1
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if count == dict_size:
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break
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self.dict_size = count
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def create_dataset(self,
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dict_size=-1,
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mergeDict=False,
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suffixes=['.src', '.trg']):
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"""
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Create seqToseq dataset
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"""
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# dataset_list and dir_list has one-to-one relationship
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train_dataset = os.path.join(self.data_path, self.train_dir_name)
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test_dataset = os.path.join(self.data_path, self.test_dir_name)
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gen_dataset = os.path.join(self.data_path, self.gen_dir_name)
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dataset_list = [train_dataset, test_dataset, gen_dataset]
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train_dir = os.path.join(self.output_path, self.train_dir_name)
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test_dir = os.path.join(self.output_path, self.test_dir_name)
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gen_dir = os.path.join(self.output_path, self.gen_dir_name)
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dir_list = [train_dir, test_dir, gen_dir]
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# create directory
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for dir in dir_list:
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if not os.path.exists(dir):
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os.makedirs(dir)
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# checkout dataset should be parallel corpora
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suffix_len = len(suffixes[0])
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for dataset in dataset_list:
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file_list = os.listdir(dataset)
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if len(file_list) % 2 == 1:
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raise RuntimeError("dataset should be parallel corpora")
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file_list.sort()
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for i in range(0, len(file_list), 2):
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if file_list[i][:-suffix_len] != file_list[i + 1][:-suffix_len]:
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raise RuntimeError(
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"source and target file name should be equal")
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# cat all the files with the same suffix in dataset
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for suffix in suffixes:
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for dataset in dataset_list:
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outname = os.path.basename(dataset) + suffix
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self.cat_file(dataset, suffix, dataset, outname)
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# concat parallel corpora and create file.list
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print 'concat parallel corpora for dataset'
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id = 0
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list = ['train.list', 'test.list', 'gen.list']
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for dataset in dataset_list:
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outname = os.path.basename(dataset)
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self.concat_file(dataset, outname + suffixes[0],
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outname + suffixes[1], dir_list[id], outname)
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save_list([os.path.join(dir_list[id], outname)],
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os.path.join(self.output_path, list[id]))
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id += 1
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# build dictionary for train data
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dict = ['src.dict', 'trg.dict']
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dict_path = [
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os.path.join(self.output_path, dict[0]),
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os.path.join(self.output_path, dict[1])
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]
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if mergeDict:
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outname = os.path.join(train_dir, train_dataset.split('/')[-1])
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print 'build src dictionary for train data'
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self.build_dict(outname, dict_path[0], dict_size)
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print 'build trg dictionary for train data'
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os.system('cp ' + dict_path[0] + ' ' + dict_path[1])
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else:
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outname = os.path.join(train_dataset, self.train_dir_name)
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for id in range(0, 2):
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suffix = suffixes[id]
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print 'build ' + suffix[1:] + ' dictionary for train data'
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self.build_dict(outname + suffix, dict_path[id], dict_size)
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print 'dictionary size is', self.dict_size
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