#include "deconvolutional_layer.h"
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#include "convolutional_layer.h"
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#include "utils.h"
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#include "im2col.h"
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#include "col2im.h"
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#include "blas.h"
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#include "gemm.h"
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#include <stdio.h>
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#include <time.h>
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int deconvolutional_out_height(deconvolutional_layer layer)
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{
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int h = layer.stride*(layer.h - 1) + layer.size;
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return h;
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}
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int deconvolutional_out_width(deconvolutional_layer layer)
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{
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int w = layer.stride*(layer.w - 1) + layer.size;
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return w;
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}
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int deconvolutional_out_size(deconvolutional_layer layer)
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{
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return deconvolutional_out_height(layer) * deconvolutional_out_width(layer);
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}
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image get_deconvolutional_image(deconvolutional_layer layer)
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{
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int h,w,c;
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h = deconvolutional_out_height(layer);
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w = deconvolutional_out_width(layer);
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c = layer.n;
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return float_to_image(w,h,c,layer.output);
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}
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image get_deconvolutional_delta(deconvolutional_layer layer)
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{
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int h,w,c;
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h = deconvolutional_out_height(layer);
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w = deconvolutional_out_width(layer);
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c = layer.n;
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return float_to_image(w,h,c,layer.delta);
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}
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deconvolutional_layer *make_deconvolutional_layer(int batch, int h, int w, int c, int n, int size, int stride, ACTIVATION activation)
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{
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int i;
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deconvolutional_layer *layer = calloc(1, sizeof(deconvolutional_layer));
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layer->h = h;
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layer->w = w;
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layer->c = c;
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layer->n = n;
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layer->batch = batch;
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layer->stride = stride;
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layer->size = size;
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layer->filters = calloc(c*n*size*size, sizeof(float));
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layer->filter_updates = calloc(c*n*size*size, sizeof(float));
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layer->biases = calloc(n, sizeof(float));
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layer->bias_updates = calloc(n, sizeof(float));
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float scale = 1./sqrt(size*size*c);
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for(i = 0; i < c*n*size*size; ++i) layer->filters[i] = scale*rand_normal();
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for(i = 0; i < n; ++i){
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layer->biases[i] = scale;
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}
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int out_h = deconvolutional_out_height(*layer);
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int out_w = deconvolutional_out_width(*layer);
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layer->col_image = calloc(h*w*size*size*n, sizeof(float));
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layer->output = calloc(layer->batch*out_h * out_w * n, sizeof(float));
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layer->delta = calloc(layer->batch*out_h * out_w * n, sizeof(float));
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#ifdef GPU
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layer->filters_gpu = cuda_make_array(layer->filters, c*n*size*size);
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layer->filter_updates_gpu = cuda_make_array(layer->filter_updates, c*n*size*size);
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layer->biases_gpu = cuda_make_array(layer->biases, n);
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layer->bias_updates_gpu = cuda_make_array(layer->bias_updates, n);
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layer->col_image_gpu = cuda_make_array(layer->col_image, h*w*size*size*n);
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layer->delta_gpu = cuda_make_array(layer->delta, layer->batch*out_h*out_w*n);
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layer->output_gpu = cuda_make_array(layer->output, layer->batch*out_h*out_w*n);
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#endif
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layer->activation = activation;
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fprintf(stderr, "Deconvolutional 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);
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return layer;
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}
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void resize_deconvolutional_layer(deconvolutional_layer *layer, int h, int w)
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{
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layer->h = h;
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layer->w = w;
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int out_h = deconvolutional_out_height(*layer);
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int out_w = deconvolutional_out_width(*layer);
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layer->col_image = realloc(layer->col_image,
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out_h*out_w*layer->size*layer->size*layer->c*sizeof(float));
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layer->output = realloc(layer->output,
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layer->batch*out_h * out_w * layer->n*sizeof(float));
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layer->delta = realloc(layer->delta,
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layer->batch*out_h * out_w * layer->n*sizeof(float));
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#ifdef GPU
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cuda_free(layer->col_image_gpu);
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cuda_free(layer->delta_gpu);
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cuda_free(layer->output_gpu);
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layer->col_image_gpu = cuda_make_array(layer->col_image, out_h*out_w*layer->size*layer->size*layer->c);
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layer->delta_gpu = cuda_make_array(layer->delta, layer->batch*out_h*out_w*layer->n);
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layer->output_gpu = cuda_make_array(layer->output, layer->batch*out_h*out_w*layer->n);
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#endif
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}
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void forward_deconvolutional_layer(const deconvolutional_layer layer, network_state state)
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{
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int i;
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int out_h = deconvolutional_out_height(layer);
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int out_w = deconvolutional_out_width(layer);
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int size = out_h*out_w;
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int m = layer.size*layer.size*layer.n;
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int n = layer.h*layer.w;
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int k = layer.c;
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bias_output(layer.output, layer.biases, layer.batch, layer.n, size);
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for(i = 0; i < layer.batch; ++i){
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float *a = layer.filters;
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float *b = state.input + i*layer.c*layer.h*layer.w;
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float *c = layer.col_image;
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gemm(1,0,m,n,k,1,a,m,b,n,0,c,n);
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col2im_cpu(c, layer.n, out_h, out_w, layer.size, layer.stride, 0, layer.output+i*layer.n*size);
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}
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activate_array(layer.output, layer.batch*layer.n*size, layer.activation);
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}
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void backward_deconvolutional_layer(deconvolutional_layer layer, network_state state)
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{
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float alpha = 1./layer.batch;
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int out_h = deconvolutional_out_height(layer);
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int out_w = deconvolutional_out_width(layer);
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int size = out_h*out_w;
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int i;
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gradient_array(layer.output, size*layer.n*layer.batch, layer.activation, layer.delta);
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backward_bias(layer.bias_updates, layer.delta, layer.batch, layer.n, size);
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if(state.delta) memset(state.delta, 0, layer.batch*layer.h*layer.w*layer.c*sizeof(float));
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for(i = 0; i < layer.batch; ++i){
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int m = layer.c;
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int n = layer.size*layer.size*layer.n;
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int k = layer.h*layer.w;
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float *a = state.input + i*m*n;
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float *b = layer.col_image;
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float *c = layer.filter_updates;
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im2col_cpu(layer.delta + i*layer.n*size, layer.n, out_h, out_w,
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layer.size, layer.stride, 0, b);
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gemm(0,1,m,n,k,alpha,a,k,b,k,1,c,n);
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if(state.delta){
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int m = layer.c;
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int n = layer.h*layer.w;
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int k = layer.size*layer.size*layer.n;
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float *a = layer.filters;
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float *b = layer.col_image;
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float *c = state.delta + i*n*m;
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gemm(0,0,m,n,k,1,a,k,b,n,1,c,n);
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}
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}
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}
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void update_deconvolutional_layer(deconvolutional_layer layer, float learning_rate, float momentum, float decay)
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{
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int size = layer.size*layer.size*layer.c*layer.n;
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axpy_cpu(layer.n, learning_rate, layer.bias_updates, 1, layer.biases, 1);
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scal_cpu(layer.n, momentum, layer.bias_updates, 1);
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axpy_cpu(size, -decay, layer.filters, 1, layer.filter_updates, 1);
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axpy_cpu(size, learning_rate, layer.filter_updates, 1, layer.filters, 1);
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scal_cpu(size, momentum, layer.filter_updates, 1);
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}
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