From ace5aeb0f59fdceb99e607af9780added20da37c Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Fri, 24 Jan 2014 22:51:17 +0000
Subject: [PATCH] MNIST connected network showing off matrices
---
src/maxpool_layer.c | 63 +++++++++++++++++++++++++++----
1 files changed, 55 insertions(+), 8 deletions(-)
diff --git a/src/maxpool_layer.c b/src/maxpool_layer.c
index 6f7d2a2..ccf9bee 100644
--- a/src/maxpool_layer.c
+++ b/src/maxpool_layer.c
@@ -1,24 +1,71 @@
#include "maxpool_layer.h"
+#include <stdio.h>
+
+image get_maxpool_image(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.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)
{
+ fprintf(stderr, "Maxpool Layer: %d x %d x %d image, %d stride\n", h,w,c,stride);
maxpool_layer *layer = calloc(1, sizeof(maxpool_layer));
+ layer->h = h;
+ layer->w = w;
+ layer->c = c;
layer->stride = stride;
- layer->output = make_image((h-1)/stride+1, (w-1)/stride+1, c);
+ layer->output = calloc(((h-1)/stride+1) * ((w-1)/stride+1) * c, sizeof(double));
+ layer->delta = calloc(((h-1)/stride+1) * ((w-1)/stride+1) * c, sizeof(double));
return layer;
}
-void run_maxpool_layer(const image input, const maxpool_layer layer)
+void forward_maxpool_layer(const maxpool_layer layer, double *in)
{
+ image input = double_to_image(layer.h, layer.w, layer.c, in);
+ image output = get_maxpool_image(layer);
int i,j,k;
- for(i = 0; i < layer.output.h*layer.output.w*layer.output.c; ++i) layer.output.data[i] = -DBL_MAX;
- for(i = 0; i < input.h; ++i){
- for(j = 0; j < input.w; ++j){
- for(k = 0; k < input.c; ++k){
+ for(i = 0; i < output.h*output.w*output.c; ++i) output.data[i] = -DBL_MAX;
+ 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(layer.output, i/layer.stride, j/layer.stride, k);
- if(val > cur) set_pixel(layer.output, i/layer.stride, j/layer.stride, k, val);
+ double cur = get_pixel(output, i/layer.stride, j/layer.stride, k);
+ if(val > cur) set_pixel(output, i/layer.stride, j/layer.stride, k, val);
}
}
}
}
+
+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);
+ }
+ }
+ }
+}
+
--
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