From 787d5345609459f21fd65d2d8b4fcd55201e21a1 Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Mon, 13 Oct 2014 07:31:10 +0000
Subject: [PATCH] Convolutional working on GPU
---
src/maxpool_layer.c | 86 +++++++++++++++++++++++++++++++++++--------
1 files changed, 70 insertions(+), 16 deletions(-)
diff --git a/src/maxpool_layer.c b/src/maxpool_layer.c
index f58a22f..070eaba 100644
--- a/src/maxpool_layer.c
+++ b/src/maxpool_layer.c
@@ -6,36 +6,90 @@
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);
}
-maxpool_layer *make_maxpool_layer(int h, int w, int c, int stride)
+image get_maxpool_delta(maxpool_layer layer)
{
- printf("Maxpool Layer: %d x %d x %d image, %d stride\n", h,w,c,stride);
+ 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 batch, int h, int w, int c, int size, int stride)
+{
+ fprintf(stderr, "Maxpool Layer: %d x %d x %d image, %d size, %d stride\n", h,w,c,size,stride);
maxpool_layer *layer = calloc(1, sizeof(maxpool_layer));
+ layer->batch = batch;
layer->h = h;
layer->w = w;
layer->c = c;
+ layer->size = size;
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->max_indexes = calloc(((h-1)/stride+1) * ((w-1)/stride+1) * c*batch, sizeof(int));
+ layer->output = calloc(((h-1)/stride+1) * ((w-1)/stride+1) * c*batch, sizeof(float));
+ layer->delta = calloc(((h-1)/stride+1) * ((w-1)/stride+1) * c*batch, sizeof(float));
return layer;
}
-void forward_maxpool_layer(const maxpool_layer layer, double *in)
+void resize_maxpool_layer(maxpool_layer *layer, int h, int w, int c)
{
- 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 < 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);
- if(val > cur) set_pixel(output, i/layer.stride, j/layer.stride, k, val);
+ layer->h = h;
+ layer->w = w;
+ layer->c = c;
+ layer->output = realloc(layer->output, ((h-1)/layer->stride+1) * ((w-1)/layer->stride+1) * c * layer->batch* sizeof(float));
+ layer->delta = realloc(layer->delta, ((h-1)/layer->stride+1) * ((w-1)/layer->stride+1) * c * layer->batch*sizeof(float));
+}
+
+void forward_maxpool_layer(const maxpool_layer layer, float *input)
+{
+ int b;
+ for(b = 0; b < layer.batch; ++b){
+ int h = (layer.h-1)/layer.stride + 1;
+ int w = (layer.w-1)/layer.stride + 1;
+ int c = layer.c;
+
+ int i,j,k,l,m;
+ for(k = 0; k < layer.c; ++k){
+ for(i = 0; i < layer.h; i += layer.stride){
+ for(j = 0; j < layer.w; j += layer.stride){
+ int out_index = j/layer.stride + w*(i/layer.stride + h*(k + c*b));
+ layer.output[out_index] = -FLT_MAX;
+ int lower = (-layer.size-1)/2 + 1;
+ int upper = layer.size/2 + 1;
+
+ int lh = (i+lower < 0) ? 0 : i+lower;
+ int uh = (i+upper > layer.h) ? layer.h : i+upper;
+
+ int lw = (j+lower < 0) ? 0 : j+lower;
+ int uw = (j+upper > layer.w) ? layer.w : j+upper;
+ for(l = lh; l < uh; ++l){
+ for(m = lw; m < uw; ++m){
+ //printf("%d %d\n", l, m);
+ int index = m + layer.w*(l + layer.h*(k + b*layer.c));
+ if(input[index] > layer.output[out_index]){
+ layer.output[out_index] = input[index];
+ layer.max_indexes[out_index] = index;
+ }
+ }
+ }
+ }
}
}
}
}
+void backward_maxpool_layer(const maxpool_layer layer, float *input, float *delta)
+{
+ int i;
+ int h = (layer.h-1)/layer.stride + 1;
+ int w = (layer.w-1)/layer.stride + 1;
+ int c = layer.c;
+ memset(delta, 0, layer.batch*layer.h*layer.w*layer.c*sizeof(float));
+ for(i = 0; i < h*w*c*layer.batch; ++i){
+ int index = layer.max_indexes[i];
+ delta[index] += layer.delta[i];
+ }
+}
+
--
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