remove gpu supported, will add it later

paddle/fluid/operators/sampling_id_op.cu

-/* 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. */
-
-#include <algorithm>
-#include <vector>
-#include "paddle/fluid/operators/sampling_id_op.h"
-
-namespace ops = paddle::operators;
-REGISTER_OP_CUDA_KERNEL(
-    sampling_id,
-    ops::SamplingIdKernel<paddle::platform::CUDADeviceContext, float>,
-    ops::SamplingIdKernel<paddle::platform::CUDADeviceContext, double>,
-    ops::SamplingIdKernel<paddle::platform::CUDADeviceContext, int>,
-    ops::SamplingIdKernel<paddle::platform::CUDADeviceContext, int64_t>);