Unittest for fluid.backward.calc_gradient()

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

+import unittest
+
+import paddle.v2.fluid as fluid
+import paddle.v2.fluid.layers as layers
+import paddle.v2.fluid.framework as framework
+import paddle.v2.fluid.optimizer as optimizer
+from paddle.v2.fluid.backward import calc_gradient
+
+
+class TestCalcGradient(unittest.TestCase):
+    def test_calc_gradient(self):
+        x = layers.create_parameter(dtype="float32", shape=[5, 10])
+        y = layers.create_parameter(dtype="float32", shape=[10, 8])
+        mul_out = layers.mul(x=x, y=y)
+        mean_out = layers.mean(x=mul_out)
+        a = calc_gradient(mean_out, mul_out)
+        b = calc_gradient(mean_out, x)
+        place = fluid.CPUPlace()
+        exe = fluid.Executor(place)
+        exe.run(fluid.default_startup_program())
+        exe.run(fluid.default_main_program(), feed={}, fetch_list=[a, b])
+
+
+if __name__ == "__main__":
+    unittest.main()