Add unit test for python wrapper.

python/paddle/v2/fluid/layers/nn.py

@@ -1985,7 +1985,8 @@ def row_conv(input, future_context_size, param_attr=None, act=None):
     In the above equation:
 
     * :math:`Out_{i}`: The i-th row of output variable with shape [1, D].
-    * :math:`\\tau`: Future context size.
+    * :math:`\\tau`: Future context size. Please note, the shape of
+            convolution kernel is [future_context_size + 1, D].
     * :math:`X_{j}`: The j-th row of input variable with shape [1, D].
     * :math:`W_{i-j}`: The (i-j)-th row of parameters with shape [1, D].
 

python/paddle/v2/fluid/tests/test_layers.py

@@ -225,6 +225,14 @@ class TestBook(unittest.TestCase):
             self.assertIsNotNone(out)
         print(str(program))
 
+    def test_row_conv(self):
+        program = Program()
+        with program_guard(program):
+            x = layers.data(name='x', shape=[16], dtype='float32', lod_level=1)
+            out = layers.row_conv(input=x, future_context_size=2)
+            self.assertIsNotNone(out)
+        print(str(program))
+
 
 if __name__ == '__main__':
     unittest.main()