Fix bugs

Author: JiayiFeng

python/paddle/fluid/layers/io.py

@@ -21,7 +21,7 @@
 
 __all__ = [
     'data', 'BlockGuardServ', 'ListenAndServ', 'Send', 'open_recordio_file',
-    'open_files', 'read_file', 'shuffle', 'double_buffer'
+    'open_files', 'read_file', 'shuffle', 'batch', 'double_buffer'
 ]
 
 
@@ -469,6 +469,11 @@ def shuffle(reader, buffer_size):
         'create_shuffle_reader', reader, {'buffer_size': int(buffer_size)})
 
 
+def batch(reader, batch_size):
+    return __create_unshared_decorated_reader__(
+        'create_batch_reader', reader, {'batch_size': int(batch_size)})
+
+
 def double_buffer(reader, place=None):
     attrs = dict()
     if place is not None:

python/paddle/fluid/tests/unittests/test_multi_pass_reader.py

@@ -43,9 +43,8 @@ def test_main(self):
                 filename='./mnist.recordio',
                 shapes=[(-1, 784), (-1, 1)],
                 lod_levels=[0, 0],
-                dtypes=['float32', 'int64'])
-            data_file = fluid.layers.io.multi_pass(
-                reader=data_file, pass_num=self.pass_num)
+                dtypes=['float32', 'int64'],
+                pass_num=self.pass_num)
             img, label = fluid.layers.read_file(data_file)
 
             if fluid.core.is_compiled_with_cuda():
@@ -65,5 +64,4 @@ def test_main(self):
                     break
                 batch_count += 1
                 self.assertLessEqual(img_val.shape[0], self.batch_size)
-            data_file.reset()
             self.assertEqual(batch_count, self.num_batch * self.pass_num)