Francesco Gatti
53 lines
1.6 KiB
Plaintext
53 lines
1.6 KiB
Plaintext
#include "kernels.h"
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__global__ void forward_maxpool_layer_kernel(int n, int in_h, int in_w, int in_c, int stride_x, int stride_y, int size, int pad, float *input, float *output)
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{
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int h = (in_h + pad - size) / stride_y + 1;
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int w = (in_w + pad - size) / stride_x + 1;
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int c = in_c;
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int id = (blockIdx.x + blockIdx.y*gridDim.x) * blockDim.x + threadIdx.x;
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if(id >= n) return;
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int j = id % w;
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id /= w;
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int i = id % h;
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id /= h;
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int k = id % c;
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id /= c;
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int b = id;
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int w_offset = -pad / 2;
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int h_offset = -pad / 2;
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int out_index = j + w*(i + h*(k + c*b));
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float max = -9999999;
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int max_i = -1;
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int l, m;
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for(l = 0; l < size; ++l){
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for(m = 0; m < size; ++m){
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int cur_h = h_offset + i*stride_y + l;
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int cur_w = w_offset + j*stride_x + m;
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int index = cur_w + in_w*(cur_h + in_h*(k + b*in_c));
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int valid = (cur_h >= 0 && cur_h < in_h &&
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cur_w >= 0 && cur_w < in_w);
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float val = (valid != 0) ? input[index] : -9999999;
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max_i = (val > max) ? index : max_i;
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max = (val > max) ? val : max;
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}
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}
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output[out_index] = max;
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}
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void MaxPoolingForward(dnnType* srcData, dnnType* dstData, int n, int c, int h, int w, int stride_x, int stride_y, int size, int padding, cudaStream_t stream)
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{
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int tot_size = n*c*h*w;
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int blocks = (tot_size+255)/256;
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int threads = 256;
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forward_maxpool_layer_kernel<<<blocks, threads, 0, stream>>>(tot_size, h, w, c, stride_x, stride_y, size, padding, srcData, dstData);
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}
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