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This commit is contained in:
Joseph Redmon
2013-12-02 16:41:40 -08:00
parent 2db9fbef2b
commit 0d6bb5d44d
29 changed files with 836 additions and 214 deletions
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30
src/maxpool_layer.c
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@ -9,6 +9,14 @@ image get_maxpool_image(maxpool_layer layer)
return double_to_image(h,w,c,layer.output);
}
image get_maxpool_delta(maxpool_layer layer)
{
int h = (layer.h-1)/layer.stride + 1;
int w = (layer.w-1)/layer.stride + 1;
int c = layer.c;
return double_to_image(h,w,c,layer.delta);
}
maxpool_layer *make_maxpool_layer(int h, int w, int c, int stride)
{
printf("Maxpool Layer: %d x %d x %d image, %d stride\n", h,w,c,stride);
@ -39,3 +47,25 @@ void forward_maxpool_layer(const maxpool_layer layer, double *in)
}
}
void backward_maxpool_layer(const maxpool_layer layer, double *in, double *delta)
{
image input = double_to_image(layer.h, layer.w, layer.c, in);
image input_delta = double_to_image(layer.h, layer.w, layer.c, delta);
image output_delta = get_maxpool_delta(layer);
image output = get_maxpool_image(layer);
int i,j,k;
for(k = 0; k < input.c; ++k){
for(i = 0; i < input.h; ++i){
for(j = 0; j < input.w; ++j){
double val = get_pixel(input, i, j, k);
double cur = get_pixel(output, i/layer.stride, j/layer.stride, k);
double d = get_pixel(output_delta, i/layer.stride, j/layer.stride, k);
if(val == cur) {
set_pixel(input_delta, i, j, k, d);
}
else set_pixel(input_delta, i, j, k, 0);
}
}
}
}