Add dataset ptb

python/paddle/v2/dataset/imikolov.py

@@ -41,7 +41,7 @@ def word_count(f, word_freq=None):
     return word_freq
 
 
-def build_dict(typo_freq=50):
+def build_dict(min_word_freq=50):
     """
     Build a word dictionary from the corpus,  Keys of the dictionary are words,
     and values are zero-based IDs of these words.
@@ -59,7 +59,7 @@ def build_dict(typo_freq=50):
             # remove <unk> for now, since we will set it as last index
             del word_freq['<unk>']
 
-        word_freq = filter(lambda x: x[1] > typo_freq, word_freq.items())
+        word_freq = filter(lambda x: x[1] > min_word_freq, word_freq.items())
 
         word_freq_sorted = sorted(word_freq, key=lambda x: (-x[1], x[0]))
         words, _ = list(zip(*word_freq_sorted))

python/paddle/v2/dataset/ptb.py

@@ -0,0 +1,169 @@
+# 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.
+"""
+langauge model's simple dataset.
+
+This module will download dataset from 
+http://www.fit.vutbr.cz/~imikolov/rnnlm/ and parse training set and test set
+into paddle reader creators.
+"""
+import paddle.v2.dataset.common
+import collections
+import tarfile
+
+__all__ = ['train', 'test', 'build_dict']
+
+URL = 'http://www.fit.vutbr.cz/~imikolov/rnnlm/simple-examples.tgz'
+MD5 = '30177ea32e27c525793142b6bf2c8e2d'
+
+
+def word_count(f, word_freq=None):
+    if word_freq is None:
+        word_freq = collections.defaultdict(int)
+
+    for l in f:
+        for w in l.strip().split():
+            word_freq[w] += 1
+        word_freq['<s>'] += 1
+        word_freq['<e>'] += 1
+
+    return word_freq
+
+
+def build_dict(min_word_freq=50):
+    """
+    Build a word dictionary from the corpus,  Keys of the dictionary are words,
+    and values are zero-based IDs of these words.
+    """
+    train_filename = './simple-examples/data/ptb.train.txt'
+    test_filename = './simple-examples/data/ptb.valid.txt'
+    with tarfile.open(
+            paddle.v2.dataset.common.download(
+                paddle.v2.dataset.imikolov.URL, 'imikolov',
+                paddle.v2.dataset.imikolov.MD5)) as tf:
+        trainf = tf.extractfile(train_filename)
+        testf = tf.extractfile(test_filename)
+        word_freq = word_count(testf, word_count(trainf))
+        if '<unk>' in word_freq:
+            # remove <unk> for now, since we will set it as last index
+            del word_freq['<unk>']
+
+        word_freq = filter(lambda x: x[1] > min_word_freq, word_freq.items())
+
+        word_freq_sorted = sorted(word_freq, key=lambda x: (-x[1], x[0]))
+        words, _ = list(zip(*word_freq_sorted))
+        word_idx = dict(zip(words, xrange(len(words))))
+        word_idx['<unk>'] = len(words)
+
+    return word_idx
+
+
+def reader_creator(filename, reader_type, word_idx, n=-1):
+    def reader():
+        with tarfile.open(
+                paddle.v2.dataset.common.download(
+                    paddle.v2.dataset.imikolov.URL, 'imikolov',
+                    paddle.v2.dataset.imikolov.MD5)) as tf:
+            f = tf.extractfile(filename)
+
+            UNK = word_idx['<unk>']
+
+            for l in f:
+                if 'ngram' == reader_type:
+                    assert n > -1, 'Invalid gram length'
+                    l = ['<s>'] + l.strip().split() + ['<e>']
+                    if len(l) < n: continue
+                    l = [word_idx.get(w, UNK) for w in l]
+                    for i in range(n, len(l) + 1):
+                        yield tuple(l[i - n:i])
+                elif 'seq' == reader_type:
+                    l = l.strip().split()
+                    l = [word_idx.get(w, UNK) for w in l]
+                    src_seq = [word_idx['<s>']] + l
+                    trg_seq = l + [word_idx['<e>']]
+                    yield src_seq, trg_seq
+
+    return reader
+
+
+def ngram_train(word_idx, n):
+    """
+    ptb ngram type training set creator.
+
+    It returns a reader creator, each sample in the reader is a word ID
+    tuple.
+
+    :param word_idx: word dictionary
+    :type word_idx: dict
+    :param n: sliding window size
+    :type n: int
+    :return: Training reader creator
+    :rtype: callable
+    """
+    return reader_creator('./simple-examples/data/ptb.train.txt', 'ngram',
+                          word_idx, n)
+
+
+def ngram_test(word_idx, n):
+    """
+    ptb ngram test set creator.
+
+    It returns a reader creator, each sample in the reader is a word ID
+    tuple.
+
+    :param word_idx: word dictionary
+    :type word_idx: dict
+    :param n: sliding window size
+    :type n: int
+    :return: Test reader creator
+    :rtype: callable
+    """
+    return reader_creator('./simple-examples/data/ptb.valid.txt', 'ngram',
+                          word_idx, n)
+
+
+def seq_train(word_idx):
+    """
+    ptb sequence type training set creator.
+
+    It returns a reader creator, each sample in the reader is a word ID
+    pair.
+
+    :param word_idx: word dictionary
+    :type word_idx: dict
+    :return: Test reader creator
+    :rtype: callable
+    """
+    return reader_creator('./simple-examples/data/ptb.train.txt', 'seq',
+                          word_idx)
+
+
+def seq_test(word_idx):
+    """
+    ptb sequence type test set creator.
+
+    It returns a reader creator, each sample in the reader is a word ID
+    pair.
+
+    :param word_idx: word dictionary
+    :type word_idx: dict
+    :return: Test reader creator
+    :rtype: callable
+    """
+    return reader_creator('./simple-examples/data/ptb.valid.txt', 'seq',
+                          word_idx)
+
+
+def fetch():
+    paddle.v2.dataset.common.download(URL, "imikolov", MD5)

python/paddle/v2/dataset/tests/ptb_test.py

@@ -0,0 +1,53 @@
+import paddle.v2.dataset.ptb
+import unittest
+
+WORD_DICT = paddle.v2.dataset.ptb.build_dict()
+
+
+class TestMikolov(unittest.TestCase):
+    def check_reader(self, reader, n):
+        for l in reader():
+            self.assertEqual(len(l), n)
+
+    def test_ngram_train(self):
+        n = 5
+        self.check_reader(paddle.v2.dataset.ptb.ngram_train(WORD_DICT, n), n)
+
+    def test_ngram_test(self):
+        n = 5
+        self.check_reader(paddle.v2.dataset.ptb.ngram_test(WORD_DICT, n), n)
+
+    def test_seq_train(self):
+        first_line = 'aer banknote berlitz calloway centrust cluett fromstein '\
+                'gitano guterman hydro-quebec ipo kia memotec mlx nahb punts '\
+                'rake regatta rubens sim snack-food ssangyong swapo wachter'
+        first_line = [
+            WORD_DICT.get(ch, WORD_DICT['<unk>'])
+            for ch in first_line.split(' ')
+        ]
+        for l in paddle.v2.dataset.ptb.seq_train(WORD_DICT)():
+            read_line = l[0][1:]
+            break
+
+        self.assertEqual(first_line, read_line)
+
+    def test_seq_test(self):
+        first_line = 'consumers may want to move their telephones a little '\
+                'closer to the tv set'
+        first_line = [
+            WORD_DICT.get(ch, WORD_DICT['<unk>'])
+            for ch in first_line.split(' ')
+        ]
+        for l in paddle.v2.dataset.ptb.seq_test(WORD_DICT)():
+            read_line = l[0][1:]
+            break
+
+        self.assertEqual(first_line, read_line)
+
+    def test_total(self):
+        _, idx = zip(*WORD_DICT.items())
+        self.assertEqual(sorted(idx)[-1], len(WORD_DICT) - 1)
+
+
+if __name__ == '__main__':
+    unittest.main()