samskalicky commented on a change in pull request #17762: Custom Operator
Random Number Generator Support
URL: https://github.com/apache/incubator-mxnet/pull/17762#discussion_r399043126
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File path: example/extensions/lib_custom_op/relu_lib.cu
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@@ -180,6 +182,75 @@ REGISTER_OP(my_state_relu)
.setCreateOpState(createOpStateCPU, "cpu")
.setCreateOpState(createOpStateGPU, "gpu");
+
+
+/* ------------------------ Below is noisy relu operator example
---------------------*/
+
+#include <curand_kernel.h>
+#include <random>
+
+#define NumRandomPerThread 64 // mxnet recommended random numbers generated
per thread
+
+__global__ void noisy_relu_gpu_forward(float *out, float *in, int64_t N, void
*states, int step) {
+ int tid = blockIdx.x * blockDim.x + threadIdx.x;
+ curandStatePhilox4_32_10_t* global_states =
(curandStatePhilox4_32_10_t*)states;
+ curandStatePhilox4_32_10_t thread_state = global_states[tid];
+
+ int start = tid * step;
+ int end = start + step;
+ for (int i=start; i<end && i<N; ++i) {
+ float noise = curand_normal(&thread_state);
+ out[i] = in[i] + noise > 0 ? in[i] + noise : 0;
Review comment:
can you add some comments to explain how/why you're calculating this for
noisy relu?
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