polish code

test=develop

python/paddle/fluid/data_feeder.py

@@ -71,7 +71,7 @@ class DataToLoDTensorConverter(object):
             for each_data in data:
                 self._feed_impl_(each_data, lod[1:], lod_level - 1)
 
-    def _check_shape_(self, shape):
+    def _check_shape(self, shape):
         for s1, s2 in zip(self.shape, shape):
             if s1 != s2 and s1 >= 0 and s2 >= 0:
                 raise ValueError(
@@ -82,9 +82,14 @@ class DataToLoDTensorConverter(object):
         arr = numpy.array(self.data, dtype=self.dtype)
         if self.shape:
             if len(arr.shape) != len(self.shape):
-                arr = arr.reshape(self.shape)
+                try:
+                    arr = arr.reshape(self.shape)
+                except ValueError:
+                    raise ValueError(
+                        "Reshape error. What is defined in data layer is {}, but receive {}"
+                        .format(self.shape, arr.shape))
             else:
-                self._check_shape_(arr.shape)
+                self._check_shape(arr.shape)
         t = core.LoDTensor()
         t.set(arr, self.place)
         if self.lod_level > 0:

python/paddle/fluid/tests/test_data_feeder.py

@@ -30,6 +30,12 @@ class TestDataFeeder(unittest.TestCase):
         self.assertEqual(result['image'].recursive_sequence_lengths(), [])
         self.assertEqual(result['label'].recursive_sequence_lengths(), [])
 
+        try:
+            result = feeder.feed([([0] * 783, [9]), ([1] * 783, [1])])
+            self.assertTrue(False)
+        except ValueError:
+            self.assertTrue(True)
+
     def test_lod_level_1_converter(self):
         # lod_level = 1
         # each sentence has a different number of words