fix op python tests

python/paddle/v2/framework/tests/test_exp_op.py

@@ -15,8 +15,8 @@ class TestExp(OpTest):
         self.check_output()
 
     def test_check_grad(self):
-        self.check_grad(["X"], "Y", max_relative_error=0.007)
+        self.check_grad(['X'], 'Y', max_relative_error=0.007)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main()

python/paddle/v2/framework/tests/test_relu_op.py

@@ -6,17 +6,15 @@ from op_test import OpTest
 class TestRelu(OpTest):
     def setUp(self):
         self.op_type = "relu"
-        self.inputs = {
+        self.inputs = {'X': np.random.uniform(-1, 1, [4, 4]).astype("float32")}
-            'X': np.random.uniform(-1, 1, [11, 17]).astype("float32")
-        }
         self.outputs = {'Y': np.maximum(self.inputs['X'], 0)}
 
     def test_check_output(self):
         self.check_output()
 
     def test_check_grad(self):
-        self.check_grad(["X"], "Y", max_relative_error=0.007)
+        self.check_grad(['X'], 'Y', max_relative_error=0.007)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main()

python/paddle/v2/framework/tests/test_sigmoid_op.py

@@ -15,8 +15,8 @@ class TestSigmoid(OpTest):
         self.check_output()
 
     def test_check_grad(self):
-        self.check_grad(["X"], "Y", max_relative_error=0.007)
+        self.check_grad(['X'], 'Y', max_relative_error=0.007)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main()