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#include <algorithm> | |
#include <vector> | |
#include "caffe/layers/relu_layer.hpp" | |
namespace caffe { | |
template <typename Dtype> | |
__global__ void ReLUForward(const int n, const Dtype* in, Dtype* out, | |
Dtype negative_slope, Dtype threshold) { | |
CUDA_KERNEL_LOOP(index, n) { | |
out[index] = (in[index] > threshold) ? (in[index] - threshold) : ((in[index] - threshold) * negative_slope); | |
} | |
} | |
template <typename Dtype> | |
void ReLULayer<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(); | |
Dtype negative_slope = this->layer_param_.relu_param().negative_slope(); | |
Dtype threshold = this->layer_param_.relu_param().threshold(); | |
// NOLINT_NEXT_LINE(whitespace/operators) | |
ReLUForward<Dtype><<<CAFFE_GET_BLOCKS(count), CAFFE_CUDA_NUM_THREADS>>>( | |
count, bottom_data, top_data, negative_slope, threshold); | |
CUDA_POST_KERNEL_CHECK; | |
// << " count: " << count << " bottom_data: " | |
// << (unsigned long)bottom_data | |
// << " top_data: " << (unsigned long)top_data | |
// << " blocks: " << CAFFE_GET_BLOCKS(count) | |
// << " threads: " << CAFFE_CUDA_NUM_THREADS; | |
} | |
template <typename Dtype> | |
__global__ void ReLUBackward(const int n, const Dtype* in_diff, | |
const Dtype* in_data, Dtype* out_diff, Dtype negative_slope, Dtype threshold) { | |
CUDA_KERNEL_LOOP(index, n) { | |
out_diff[index] = in_diff[index] * ((in_data[index] > threshold) | |
+ (in_data[index] <= threshold) * negative_slope); | |
} | |
} | |
template <typename Dtype> | |
void ReLULayer<Dtype>::Backward_gpu(const vector<Blob<Dtype>*>& top, | |
const vector<bool>& propagate_down, | |
const vector<Blob<Dtype>*>& bottom) { | |
if (propagate_down[0]) { | |
const Dtype* bottom_data = bottom[0]->gpu_data(); | |
const Dtype* top_diff = top[0]->gpu_diff(); | |
Dtype* bottom_diff = bottom[0]->mutable_gpu_diff(); | |
const int count = bottom[0]->count(); | |
Dtype negative_slope = this->layer_param_.relu_param().negative_slope(); | |
Dtype threshold = this->layer_param_.relu_param().threshold(); | |
// NOLINT_NEXT_LINE(whitespace/operators) | |
ReLUBackward<Dtype><<<CAFFE_GET_BLOCKS(count), CAFFE_CUDA_NUM_THREADS>>>( | |
count, top_diff, bottom_data, bottom_diff, negative_slope, threshold); | |
CUDA_POST_KERNEL_CHECK; | |
} | |
} | |
INSTANTIATE_LAYER_GPU_FUNCS(ReLULayer); | |
} // namespace caffe |
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