[GitHub] [incubator-mxnet] rondogency commented on a change in pull request #17270: Dynamic custom operator GPU support

[GitBox <gi...@apache.org>]

rondogency commented on a change in pull request #17270: Dynamic custom operator GPU support
URL: https://github.com/apache/incubator-mxnet/pull/17270#discussion_r371045630
 
 

 ##########
 File path: example/extensions/lib_custom_op/relu_lib.cu
 ##########
 @@ -0,0 +1,193 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+/*!
+ * Copyright (c) 2020 by Contributors
+ * \file relu_lib.cu
+ * \brief simple custom relu operator implemented using CUDA function
+ */
+
+#include <iostream>
+#include "lib_api.h"
+
+__global__ void relu_gpu_forward(float *out, float *in, int64_t N) {
+    int tid = blockIdx.x * blockDim.x + threadIdx.x;
+    if (tid < N)
+        out[tid] = in[tid] > 0 ? in[tid] : 0;
+}
+
+__global__ void relu_gpu_backward(float *out, float *in, int64_t N) {
+    int tid = blockIdx.x * blockDim.x + threadIdx.x;
+    if (tid < N)
+        out[tid] = in[tid] > 0 ? 1 : 0;
 
 Review comment:
   thanks for pointing out the error. I have made the fix

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