add squared mat sub unit test

test=develop

python/paddle/fluid/tests/unittests/test_fusion_squared_mat_sub_op.py

+#   Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+
+import unittest
+import numpy as np
+from op_test import OpTest
+
+
+class TestFusionSquaredMatSubOp(OpTest):
+    def setUp(self):
+        self.op_type = 'fusion_squared_mat_sub'
+        self.m = 11
+        self.n = 12
+        self.k = 4
+        self.scalar = 0.5
+        self.set_conf()
+        matx = np.random.random((self.m, self.k)).astype("float32")
+        maty = np.random.random((self.k, self.n)).astype("float32")
+
+        self.inputs = {'X': matx, 'Y': maty}
+        self.outputs = {
+            'Out':
+            (np.dot(matx**2, maty**2) - np.dot(matx, maty)**2) * self.scalar
+        }
+        self.attrs = {'scalar': self.scalar, }
+
+    def set_conf(self):
+        pass
+
+    def test_check_output(self):
+        self.check_output()
+
+
+class TestFusionSquaredMatSubOpCase1(TestFusionSquaredMatSubOp):
+    def set_conf(self):
+        self.scalar = -0.3
+
+
+if __name__ == '__main__':
+    unittest.main()