From ac82bde55f3206a7a0d1b7a7580bea05096af32b Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Thu, 17 Apr 2014 22:07:00 +0000
Subject: [PATCH] New feature extraction method
---
src/convolutional_layer.c | 174 ++++++++++++++++++++++++++++++++++-----------------------
1 files changed, 104 insertions(+), 70 deletions(-)
diff --git a/src/convolutional_layer.c b/src/convolutional_layer.c
index 6a103f6..6916eeb 100644
--- a/src/convolutional_layer.c
+++ b/src/convolutional_layer.c
@@ -3,11 +3,21 @@
#include "mini_blas.h"
#include <stdio.h>
+int convolutional_out_height(convolutional_layer layer)
+{
+ return (layer.h-layer.size)/layer.stride + 1;
+}
+
+int convolutional_out_width(convolutional_layer layer)
+{
+ return (layer.w-layer.size)/layer.stride + 1;
+}
+
image get_convolutional_image(convolutional_layer layer)
{
int h,w,c;
- h = layer.out_h;
- w = layer.out_w;
+ h = convolutional_out_height(layer);
+ w = convolutional_out_width(layer);
c = layer.n;
return float_to_image(h,w,c,layer.output);
}
@@ -15,22 +25,22 @@
image get_convolutional_delta(convolutional_layer layer)
{
int h,w,c;
- h = layer.out_h;
- w = layer.out_w;
+ h = convolutional_out_height(layer);
+ w = convolutional_out_width(layer);
c = layer.n;
return float_to_image(h,w,c,layer.delta);
}
-convolutional_layer *make_convolutional_layer(int h, int w, int c, int n, int size, int stride, ACTIVATION activation)
+convolutional_layer *make_convolutional_layer(int batch, int h, int w, int c, int n, int size, int stride, ACTIVATION activation)
{
int i;
- int out_h,out_w;
size = 2*(size/2)+1; //HA! And you thought you'd use an even sized filter...
convolutional_layer *layer = calloc(1, sizeof(convolutional_layer));
layer->h = h;
layer->w = w;
layer->c = c;
layer->n = n;
+ layer->batch = batch;
layer->stride = stride;
layer->size = size;
@@ -47,15 +57,13 @@
//layer->biases[i] = rand_normal()*scale + scale;
layer->biases[i] = 0;
}
- out_h = (h-size)/stride + 1;
- out_w = (w-size)/stride + 1;
+ int out_h = convolutional_out_height(*layer);
+ int out_w = convolutional_out_width(*layer);
- layer->col_image = calloc(out_h*out_w*size*size*c, sizeof(float));
- layer->output = calloc(out_h * out_w * n, sizeof(float));
- layer->delta = calloc(out_h * out_w * n, sizeof(float));
+ layer->col_image = calloc(layer->batch*out_h*out_w*size*size*c, sizeof(float));
+ layer->output = calloc(layer->batch*out_h * out_w * n, sizeof(float));
+ layer->delta = calloc(layer->batch*out_h * out_w * n, sizeof(float));
layer->activation = activation;
- layer->out_h = out_h;
- layer->out_w = out_w;
fprintf(stderr, "Convolutional Layer: %d x %d x %d image, %d filters -> %d x %d x %d image\n", h,w,c,n, out_h, out_w, n);
srand(0);
@@ -63,21 +71,39 @@
return layer;
}
+void resize_convolutional_layer(convolutional_layer *layer, int h, int w, int c)
+{
+ layer->h = h;
+ layer->w = w;
+ layer->c = c;
+ int out_h = convolutional_out_height(*layer);
+ int out_w = convolutional_out_width(*layer);
+
+ layer->col_image = realloc(layer->col_image,
+ layer->batch*out_h*out_w*layer->size*layer->size*layer->c*sizeof(float));
+ layer->output = realloc(layer->output,
+ layer->batch*out_h * out_w * layer->n*sizeof(float));
+ layer->delta = realloc(layer->delta,
+ layer->batch*out_h * out_w * layer->n*sizeof(float));
+}
+
void forward_convolutional_layer(const convolutional_layer layer, float *in)
{
int i;
int m = layer.n;
int k = layer.size*layer.size*layer.c;
- int n = ((layer.h-layer.size)/layer.stride + 1)*
- ((layer.w-layer.size)/layer.stride + 1);
+ int n = convolutional_out_height(layer)*
+ convolutional_out_width(layer)*
+ layer.batch;
memset(layer.output, 0, m*n*sizeof(float));
float *a = layer.filters;
float *b = layer.col_image;
float *c = layer.output;
-
- im2col_cpu(in, layer.c, layer.h, layer.w, layer.size, layer.stride, b);
+ for(i = 0; i < layer.batch; ++i){
+ im2col_cpu(in+i*(n/layer.batch), layer.c, layer.h, layer.w, layer.size, layer.stride, b+i*(n/layer.batch));
+ }
gemm(0,0,m,n,k,1,a,k,b,n,1,c,n);
for(i = 0; i < m*n; ++i){
@@ -90,21 +116,28 @@
void gradient_delta_convolutional_layer(convolutional_layer layer)
{
int i;
- for(i = 0; i < layer.out_h*layer.out_w*layer.n; ++i){
+ int size = convolutional_out_height(layer)*
+ convolutional_out_width(layer)*
+ layer.n*
+ layer.batch;
+ for(i = 0; i < size; ++i){
layer.delta[i] *= gradient(layer.output[i], layer.activation);
}
}
void learn_bias_convolutional_layer(convolutional_layer layer)
{
- int i,j;
- int size = layer.out_h*layer.out_w;
- for(i = 0; i < layer.n; ++i){
- float sum = 0;
- for(j = 0; j < size; ++j){
- sum += layer.delta[j+i*size];
+ int i,j,b;
+ int size = convolutional_out_height(layer)
+ *convolutional_out_width(layer);
+ for(b = 0; b < layer.batch; ++b){
+ for(i = 0; i < layer.n; ++i){
+ float sum = 0;
+ for(j = 0; j < size; ++j){
+ sum += layer.delta[j+size*(i+b*layer.n)];
+ }
+ layer.bias_updates[i] += sum/size;
}
- layer.bias_updates[i] += sum/size;
}
}
@@ -114,8 +147,9 @@
learn_bias_convolutional_layer(layer);
int m = layer.n;
int n = layer.size*layer.size*layer.c;
- int k = ((layer.h-layer.size)/layer.stride + 1)*
- ((layer.w-layer.size)/layer.stride + 1);
+ int k = convolutional_out_height(layer)*
+ convolutional_out_width(layer)*
+ layer.batch;
float *a = layer.delta;
float *b = layer.col_image;
@@ -126,10 +160,12 @@
void backward_convolutional_layer(convolutional_layer layer, float *delta)
{
+ int i;
int m = layer.size*layer.size*layer.c;
int k = layer.n;
- int n = ((layer.h-layer.size)/layer.stride + 1)*
- ((layer.w-layer.size)/layer.stride + 1);
+ int n = convolutional_out_height(layer)*
+ convolutional_out_width(layer)*
+ layer.batch;
float *a = layer.filters;
float *b = layer.delta;
@@ -139,8 +175,10 @@
memset(c, 0, m*n*sizeof(float));
gemm(1,0,m,n,k,1,a,m,b,n,1,c,n);
- memset(delta, 0, layer.h*layer.w*layer.c*sizeof(float));
- col2im_cpu(c, layer.c, layer.h, layer.w, layer.size, layer.stride, delta);
+ memset(delta, 0, layer.batch*layer.h*layer.w*layer.c*sizeof(float));
+ for(i = 0; i < layer.batch; ++i){
+ col2im_cpu(c+i*n/layer.batch, layer.c, layer.h, layer.w, layer.size, layer.stride, delta+i*n/layer.batch);
+ }
}
void update_convolutional_layer(convolutional_layer layer, float step, float momentum, float decay)
@@ -214,7 +252,7 @@
void test_convolutional_layer()
{
- convolutional_layer l = *make_convolutional_layer(4,4,1,1,3,1,LINEAR);
+ convolutional_layer l = *make_convolutional_layer(1,4,4,1,1,3,1,LINEAR);
float input[] = {1,2,3,4,
5,6,7,8,
9,10,11,12,
@@ -247,52 +285,48 @@
return float_to_image(h,w,c,layer.filters+i*h*w*c);
}
-void visualize_convolutional_layer(convolutional_layer layer, char *window)
+image *weighted_sum_filters(convolutional_layer layer, image *prev_filters)
{
- int color = 1;
- int border = 1;
- int h,w,c;
- int size = layer.size;
- h = size;
- w = (size + border) * layer.n - border;
- c = layer.c;
- if(c != 3 || !color){
- h = (h+border)*c - border;
- c = 1;
+ image *filters = calloc(layer.n, sizeof(image));
+ int i,j,k,c;
+ if(!prev_filters){
+ for(i = 0; i < layer.n; ++i){
+ filters[i] = copy_image(get_convolutional_filter(layer, i));
+ }
}
-
- image filters = make_image(h,w,c);
- int i,j;
- for(i = 0; i < layer.n; ++i){
- int w_offset = i*(size+border);
- image k = get_convolutional_filter(layer, i);
- //printf("%f ** ", layer.biases[i]);
- //print_image(k);
- image copy = copy_image(k);
- normalize_image(copy);
- for(j = 0; j < k.c; ++j){
- //set_pixel(copy,0,0,j,layer.biases[i]);
- }
- if(c == 3 && color){
- embed_image(copy, filters, 0, w_offset);
- }
- else{
- for(j = 0; j < k.c; ++j){
- int h_offset = j*(size+border);
- image layer = get_image_layer(k, j);
- embed_image(layer, filters, h_offset, w_offset);
- free_image(layer);
+ else{
+ image base = prev_filters[0];
+ for(i = 0; i < layer.n; ++i){
+ image filter = get_convolutional_filter(layer, i);
+ filters[i] = make_image(base.h, base.w, base.c);
+ for(j = 0; j < layer.size; ++j){
+ for(k = 0; k < layer.size; ++k){
+ for(c = 0; c < layer.c; ++c){
+ float weight = get_pixel(filter, j, k, c);
+ image prev_filter = copy_image(prev_filters[c]);
+ scale_image(prev_filter, weight);
+ add_into_image(prev_filter, filters[i], 0,0);
+ free_image(prev_filter);
+ }
+ }
}
}
- free_image(copy);
}
- image delta = get_convolutional_delta(layer);
+ return filters;
+}
+
+image *visualize_convolutional_layer(convolutional_layer layer, char *window, image *prev_filters)
+{
+ image *single_filters = weighted_sum_filters(layer, 0);
+ show_images(single_filters, layer.n, window);
+
+ image delta = get_convolutional_image(layer);
image dc = collapse_image_layers(delta, 1);
char buff[256];
- sprintf(buff, "%s: Delta", window);
+ sprintf(buff, "%s: Output", window);
show_image(dc, buff);
+ save_image(dc, buff);
free_image(dc);
- show_image(filters, window);
- free_image(filters);
+ return single_filters;
}
--
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