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dropout_layer_hip.cpp
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dropout_layer_hip.cpp
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#include <vector>
#include "caffe/layers/dropout_layer.hpp"
#include "caffe/util/math_functions.hpp"
namespace caffe {
template <typename Dtype>
__global__ void DropoutForward(const int n, const Dtype* in,
const unsigned int* mask, const unsigned int threshold, const float scale,
Dtype* out) {
HIP_KERNEL_LOOP(index, n) {
out[index] = in[index] * (mask[index] > threshold) * scale;
}
}
template <typename Dtype>
void DropoutLayer<Dtype>::Forward_gpu(const vector<Blob<Dtype>*>& bottom,
const vector<Blob<Dtype>*>& top) {
const Dtype* bottom_data = bottom[0]->gpu_data();
Dtype* top_data = top[0]->mutable_gpu_data();
const int count = bottom[0]->count();
if (this->phase_ == TRAIN) {
unsigned int* mask =
static_cast<unsigned int*>(rand_vec_.mutable_gpu_data());
caffe_gpu_rng_uniform(count, mask);
// set thresholds
// NOLINT_NEXT_LINE(whitespace/operators)
hipLaunchKernelGGL(DropoutForward<Dtype>, dim3(CAFFE_GET_BLOCKS(count)), dim3(CAFFE_HIP_NUM_THREADS), 0, 0,
count, bottom_data, mask, uint_thres_, scale_, top_data);
// HIP_POST_KERNEL_CHECK;
} else {
caffe_copy(count, bottom_data, top_data);
}
}
template <typename Dtype>
__global__ void DropoutBackward(const int n, const Dtype* in_diff,
const unsigned int* mask, const unsigned int threshold, const float scale,
Dtype* out_diff) {
HIP_KERNEL_LOOP(index, n) {
out_diff[index] = in_diff[index] * scale * (mask[index] > threshold);
}
}
template <typename Dtype>
void DropoutLayer<Dtype>::Backward_gpu(const vector<Blob<Dtype>*>& top,
const vector<bool>& propagate_down,
const vector<Blob<Dtype>*>& bottom) {
if (propagate_down[0]) {
const Dtype* top_diff = top[0]->gpu_diff();
Dtype* bottom_diff = bottom[0]->mutable_gpu_diff();
if (this->phase_ == TRAIN) {
const unsigned int* mask =
static_cast<const unsigned int*>(rand_vec_.gpu_data());
const int count = bottom[0]->count();
// NOLINT_NEXT_LINE(whitespace/operators)
hipLaunchKernelGGL(DropoutBackward<Dtype>, dim3(CAFFE_GET_BLOCKS(count)),
dim3(CAFFE_HIP_NUM_THREADS), 0, 0,
count, top_diff, mask, uint_thres_, scale_, bottom_diff);
// HIP_POST_KERNEL_CHECK;
} else {
caffe_copy(top[0]->count(), top_diff, bottom_diff);
}
}
}
INSTANTIATE_LAYER_GPU_FUNCS(DropoutLayer);
} // namespace caffe