diff --git a/python/paddle/trainer/PyDataProvider2.py b/python/paddle/trainer/PyDataProvider2.py
index bd24c68b6fe88eab03c814f8cac70db3880316f4..afde7453a15fc0cc0196efac807dcc407869ec54 100644
--- a/python/paddle/trainer/PyDataProvider2.py
+++ b/python/paddle/trainer/PyDataProvider2.py
@@ -65,14 +65,18 @@ def sparse_value_slot(dim, seq_type=SequenceType.NO_SEQUENCE):
     return InputType(dim, seq_type, DataType.SparseValue)
 
 
-def index_slot(dim, seq_type=SequenceType.NO_SEQUENCE):
-    return InputType(dim, seq_type, DataType.Index)
+def index_slot(ele_range, seq_type=SequenceType.NO_SEQUENCE):
+    """Data type of integer.
+    :param ele_range: range of this integer.
+    """
+    return InputType(ele_range, seq_type, DataType.Index)
 
 
 dense_vector = dense_slot
 sparse_binary_vector = sparse_non_value_slot
 sparse_vector = sparse_value_slot
 integer_value = index_slot
+integer_value.__doc__ = index_slot.__doc__
 
 
 def dense_vector_sequence(dim):
@@ -99,8 +103,11 @@ def sparse_vector_sub_sequence(dim):
     return sparse_vector(dim, seq_type=SequenceType.SUB_SEQUENCE)
 
 
-def integer_value_sequence(dim):
-    return integer_value(dim, seq_type=SequenceType.SEQUENCE)
+def integer_value_sequence(ele_range):
+    """Data type of a sequence of integer.
+    :param ele_range: range of each element.
+    """
+    return integer_value(ele_range, seq_type=SequenceType.SEQUENCE)
 
 
 def integer_value_sub_sequence(dim):
@@ -108,6 +115,7 @@ def integer_value_sub_sequence(dim):
 
 
 integer_sequence = integer_value_sequence
+integer_sequence.__doc__ = integer_value_sequence.__doc__
 
 
 class SingleSlotWrapper(object):
diff --git a/python/paddle/v2/tests/test_data_feeder.py b/python/paddle/v2/tests/test_data_feeder.py
index ab2bc5df76cd839b5b0184e9559f0c2e03baf38b..1b1f5aef8b811b320d382d558afb3532932b3ebf 100644
--- a/python/paddle/v2/tests/test_data_feeder.py
+++ b/python/paddle/v2/tests/test_data_feeder.py
@@ -110,14 +110,14 @@ class DataFeederTest(unittest.TestCase):
             self.assertAlmostEqual(value.all(), w[i].all())
 
     def test_integer(self):
-        dim = 100
+        ele_range = 100
         batch_size = 32
         index = []
         for i in xrange(batch_size):
             each_sample = []
-            each_sample.append(np.random.randint(dim))
+            each_sample.append(np.random.randint(ele_range))
             index.append(each_sample)
-        feeder = DataFeeder([('input', data_type.integer_value(dim))],
+        feeder = DataFeeder([('input', data_type.integer_value(ele_range))],
                             {'input': 0})
         arg = feeder(index)
         output = arg.getSlotIds(0).copyToNumpyArray()
@@ -125,7 +125,7 @@ class DataFeederTest(unittest.TestCase):
         self.assertEqual(output.all(), index.flatten().all())
 
     def test_integer_sequence(self):
-        dim = 10000
+        ele_range = 10000
         batch_size = 32
         start = [0]
         data = []
@@ -133,11 +133,12 @@ class DataFeederTest(unittest.TestCase):
             each_sample = []
             each_sample.append(
                 self.sparse_binary_reader(
-                    dim, 30, non_empty=True))
+                    ele_range, 30, non_empty=True))
             data.append(each_sample)
             start.append(len(each_sample[0]) + start[-1])
-        feeder = DataFeeder([('input', data_type.integer_value_sequence(dim))],
-                            {'input': 0})
+        feeder = DataFeeder(
+            [('input', data_type.integer_value_sequence(ele_range))],
+            {'input': 0})
         arg = feeder(data)
         output_data = arg.getSlotIds(0).copyToNumpyArray()
         output_start = arg.getSlotSequenceStartPositions(0).copyToNumpyArray()