From f7a17f82eb43de864a4f980f235055da9685eef8 Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Wed, 29 Jan 2014 00:28:42 +0000
Subject: [PATCH] Convolutional layers working w/ matrices
---
src/maxpool_layer.c | 46 ++++++++++++++++++++++++++++++++++++++--------
1 files changed, 38 insertions(+), 8 deletions(-)
diff --git a/src/maxpool_layer.c b/src/maxpool_layer.c
index f58a22f..8c409b9 100644
--- a/src/maxpool_layer.c
+++ b/src/maxpool_layer.c
@@ -6,36 +6,66 @@
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);
+ return float_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 float_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);
+ 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 = 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));
+ layer->output = calloc(((h-1)/stride+1) * ((w-1)/stride+1) * c, sizeof(float));
+ layer->delta = calloc(((h-1)/stride+1) * ((w-1)/stride+1) * c, sizeof(float));
return layer;
}
-void forward_maxpool_layer(const maxpool_layer layer, double *in)
+void forward_maxpool_layer(const maxpool_layer layer, float *in)
{
- image input = double_to_image(layer.h, layer.w, layer.c, in);
+ image input = float_to_image(layer.h, layer.w, layer.c, in);
image output = get_maxpool_image(layer);
int i,j,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(output, i/layer.stride, j/layer.stride, k);
+ float val = get_pixel(input, i, j, k);
+ float 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, float *in, float *delta)
+{
+ image input = float_to_image(layer.h, layer.w, layer.c, in);
+ image input_delta = float_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){
+ float val = get_pixel(input, i, j, k);
+ float cur = get_pixel(output, i/layer.stride, j/layer.stride, k);
+ float 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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