提交 6b52ec51 编写于 作者: W wangkuiyi 提交者: GitHub

Merge pull request #1490 from wangkuiyi/imdb-dataset

Add IMDB dataset without need of NLTK
......@@ -32,3 +32,10 @@ def download(url, module_name, md5sum):
shutil.copyfileobj(r.raw, f)
return filename
def dict_add(a_dict, ele):
if ele in a_dict:
a_dict[ele] += 1
else:
a_dict[ele] = 1
# /usr/bin/env python
# -*- coding:utf-8 -*-
# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
IMDB dataset: http://ai.stanford.edu/%7Eamaas/data/sentiment/aclImdb_v1.tar.gz
"""
import paddle.v2.dataset.common
import tarfile
import Queue
import re
import string
import threading
__all__ = ['build_dict', 'train', 'test']
URL = 'http://ai.stanford.edu/%7Eamaas/data/sentiment/aclImdb_v1.tar.gz'
MD5 = '7c2ac02c03563afcf9b574c7e56c153a'
# Read files that match pattern. Tokenize and yield each file.
def tokenize(pattern):
with tarfile.open(paddle.v2.dataset.common.download(URL, 'imdb',
MD5)) as tarf:
# Note that we should use tarfile.next(), which does
# sequential access of member files, other than
# tarfile.extractfile, which does random access and might
# destroy hard disks.
tf = tarf.next()
while tf != None:
if bool(pattern.match(tf.name)):
# newline and punctuations removal and ad-hoc tokenization.
yield tarf.extractfile(tf).read().rstrip("\n\r").translate(
None, string.punctuation).lower().split()
tf = tarf.next()
def build_dict(pattern, cutoff):
word_freq = {}
for doc in tokenize(pattern):
for word in doc:
paddle.v2.dataset.common.dict_add(word_freq, word)
# Not sure if we should prune less-frequent words here.
word_freq = filter(lambda x: x[1] > cutoff, word_freq.items())
dictionary = sorted(word_freq, key=lambda x: (-x[1], x[0]))
words, _ = list(zip(*dictionary))
word_idx = dict(zip(words, xrange(len(words))))
word_idx['<unk>'] = len(words)
return word_idx
def reader_creator(pos_pattern, neg_pattern, word_idx, buffer_size):
UNK = word_idx['<unk>']
qs = [Queue.Queue(maxsize=buffer_size), Queue.Queue(maxsize=buffer_size)]
def load(pattern, queue):
for doc in tokenize(pattern):
queue.put(doc)
queue.put(None)
def reader():
# Creates two threads that loads positive and negative samples
# into qs.
t0 = threading.Thread(
target=load, args=(
pos_pattern,
qs[0], ))
t0.daemon = True
t0.start()
t1 = threading.Thread(
target=load, args=(
neg_pattern,
qs[1], ))
t1.daemon = True
t1.start()
# Read alternatively from qs[0] and qs[1].
i = 0
doc = qs[i].get()
while doc != None:
yield [word_idx.get(w, UNK) for w in doc], i % 2
i += 1
doc = qs[i % 2].get()
# If any queue is empty, reads from the other queue.
i += 1
doc = qs[i % 2].get()
while doc != None:
yield [word_idx.get(w, UNK) for w in doc], i % 2
doc = qs[i % 2].get()
return reader()
def train(word_idx):
return reader_creator(
re.compile("aclImdb/train/pos/.*\.txt$"),
re.compile("aclImdb/train/neg/.*\.txt$"), word_idx, 1000)
def test(word_idx):
return reader_creator(
re.compile("aclImdb/test/pos/.*\.txt$"),
re.compile("aclImdb/test/neg/.*\.txt$"), word_idx, 1000)
import paddle.v2.dataset.imdb
import unittest
import re
TRAIN_POS_PATTERN = re.compile("aclImdb/train/pos/.*\.txt$")
TRAIN_NEG_PATTERN = re.compile("aclImdb/train/neg/.*\.txt$")
TRAIN_PATTERN = re.compile("aclImdb/train/.*\.txt$")
TEST_POS_PATTERN = re.compile("aclImdb/test/pos/.*\.txt$")
TEST_NEG_PATTERN = re.compile("aclImdb/test/neg/.*\.txt$")
TEST_PATTERN = re.compile("aclImdb/test/.*\.txt$")
class TestIMDB(unittest.TestCase):
word_idx = None
def test_build_dict(self):
if self.word_idx == None:
self.word_idx = paddle.v2.dataset.imdb.build_dict(TRAIN_PATTERN,
150)
self.assertEqual(len(self.word_idx), 7036)
def check_dataset(self, dataset, expected_size):
if self.word_idx == None:
self.word_idx = paddle.v2.dataset.imdb.build_dict(TRAIN_PATTERN,
150)
sum = 0
for l in dataset(self.word_idx):
self.assertEqual(l[1], sum % 2)
sum += 1
self.assertEqual(sum, expected_size)
def test_train(self):
self.check_dataset(paddle.v2.dataset.imdb.train, 25000)
def test_test(self):
self.check_dataset(paddle.v2.dataset.imdb.test, 25000)
if __name__ == '__main__':
unittest.main()
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