gather op added with python unittest

paddle/operators/gather_op.cu

+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+   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. */
+
+#define EIGEN_USE_GPU
+#include "paddle/operators/gather_op.h"
+
+namespace ops = paddle::operators;
+REGISTER_OP_GPU_KERNEL(gather,
+                       ops::GatherOpKernel<paddle::platform::GPUPlace, float>);

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

+import unittest
+
+import numpy
+import paddle.v2.framework.core as core
+from paddle.v2.framework.op import Operator
+
+from op_test_util import OpTestMeta
+
+
+class TestGatherOp(unittest.TestCase):
+    __metaclass__ = OpTestMeta
+
+    def setUp(self):
+        self.type = "gather"
+        self.inputs = {
+            'X': numpy.random.random((10, 20)).astype("float32"),
+            'Index': numpy.array([1, 3, 5]).astype("int")
+        }
+        self.outputs = {'Y': self.input['X'][self.input['Index']]}
+
+
+if __name__ == "__main__":
+    unittest.main()