add download api for dataset

Author: Yancey0623

python/paddle/v2/dataset/cifar.py

@@ -75,3 +75,8 @@ def test10():
     return reader_creator(
         paddle.v2.dataset.common.download(CIFAR10_URL, 'cifar', CIFAR10_MD5),
         'test_batch')
+
+
+def download():
+    paddle.v2.dataset.common.download(CIFAR10_URL, 'cifar', CIFAR10_MD5)
+    paddle.v2.dataset.common.download(CIFAR100_URL, 'cifar', CIFAR100_MD5)

python/paddle/v2/dataset/conll05.py

@@ -196,3 +196,11 @@ def test():
         words_name='conll05st-release/test.wsj/words/test.wsj.words.gz',
         props_name='conll05st-release/test.wsj/props/test.wsj.props.gz')
     return reader_creator(reader, word_dict, verb_dict, label_dict)
+
+
+def download():
+    paddle.v2.dataset.common.download(WORDDICT_URL, 'conll05st', WORDDICT_MD5)
+    paddle.v2.dataset.common.download(VERBDICT_URL, 'conll05st', VERBDICT_MD5)
+    paddle.v2.dataset.common.download(TRGDICT_URL, 'conll05st', TRGDICT_MD5)
+    paddle.v2.dataset.common.download(EMB_URL, 'conll05st', EMB_MD5)
+    paddle.v2.dataset.common.download(DATA_URL, 'conll05st', DATA_MD5)

python/paddle/v2/dataset/imdb.py

@@ -123,3 +123,7 @@ def test(word_idx):
 def word_dict():
     return build_dict(
         re.compile("aclImdb/((train)|(test))/((pos)|(neg))/.*\.txt$"), 150)
+
+
+def download():
+    paddle.v2.dataset.common.download(URL, 'imdb', MD5)

python/paddle/v2/dataset/imikolov.py

@@ -89,3 +89,7 @@ def train(word_idx, n):
 
 def test(word_idx, n):
     return reader_creator('./simple-examples/data/ptb.valid.txt', word_idx, n)
+
+
+def download():
+    paddle.v2.dataset.common.download(URL, "imikolov", MD5)

python/paddle/v2/dataset/mnist.py

@@ -106,3 +106,8 @@ def test():
                                           TEST_IMAGE_MD5),
         paddle.v2.dataset.common.download(TEST_LABEL_URL, 'mnist',
                                           TEST_LABEL_MD5), 100)
+
+
+def download():
+    paddle.v2.dataset.common.download(TRAIN_IMAGE_URL, 'mnist', TRAIN_IMAGE_MD5)
+    paddle.v2.dataset.common.download(TRAIN_LABEL_URL, 'mnist', TRAIN_LABEL_MD5)

python/paddle/v2/dataset/movielens.py

@@ -30,6 +30,9 @@
 
 age_table = [1, 18, 25, 35, 45, 50, 56]
 
+URL = 'http://files.grouplens.org/datasets/movielens/ml-1m.zip'
+MD5 = 'c4d9eecfca2ab87c1945afe126590906'
+
 
 class MovieInfo(object):
     def __init__(self, index, categories, title):
@@ -77,10 +80,7 @@ def __repr__(self):
 
 
 def __initialize_meta_info__():
-    fn = download(
-        url='http://files.grouplens.org/datasets/movielens/ml-1m.zip',
-        module_name='movielens',
-        md5sum='c4d9eecfca2ab87c1945afe126590906')
+    fn = download(URL, "movielens", MD5)
     global MOVIE_INFO
     if MOVIE_INFO is None:
         pattern = re.compile(r'^(.*)\((\d+)\)$')
@@ -205,5 +205,9 @@ def unittest():
     print train_count, test_count
 
 
+def download():
+    paddle.v2.dataset.common.download(URL, "movielens", MD5)
+
+
 if __name__ == '__main__':
     unittest()

python/paddle/v2/dataset/sentiment.py

@@ -125,3 +125,7 @@ def test():
     """
     data_set = load_sentiment_data()
     return reader_creator(data_set[NUM_TRAINING_INSTANCES:])
+
+
+def download():
+    nltk.download('movie_reviews', download_dir=common.DATA_HOME)

python/paddle/v2/dataset/uci_housing.py

@@ -89,3 +89,7 @@ def reader():
             yield d[:-1], d[-1:]
 
     return reader
+
+
+def download():
+    paddle.v2.dataset.common.download(URL, 'uci_housing', MD5)

python/paddle/v2/dataset/wmt14.py

@@ -103,3 +103,7 @@ def test(dict_size):
     return reader_creator(
         paddle.v2.dataset.common.download(URL_TRAIN, 'wmt14', MD5_TRAIN),
         'test/test', dict_size)
+
+
+def download():
+    paddle.v2.dataset.common.download(URL_TRAIN, 'wmt14', MD5_TRAIN)