#include "detection_layer.h"
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#include "activations.h"
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#include "softmax_layer.h"
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#include "blas.h"
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#include "box.h"
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#include "cuda.h"
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#include "utils.h"
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#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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detection_layer make_detection_layer(int batch, int inputs, int n, int side, int classes, int coords, int rescore)
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{
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detection_layer l = {0};
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l.type = DETECTION;
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l.n = n;
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l.batch = batch;
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l.inputs = inputs;
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l.classes = classes;
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l.coords = coords;
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l.rescore = rescore;
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l.side = side;
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assert(side*side*((1 + l.coords)*l.n + l.classes) == inputs);
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l.cost = calloc(1, sizeof(float));
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l.outputs = l.inputs;
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l.truths = l.side*l.side*(1+l.coords+l.classes);
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l.output = calloc(batch*l.outputs, sizeof(float));
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l.delta = calloc(batch*l.outputs, sizeof(float));
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#ifdef GPU
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l.output_gpu = cuda_make_array(l.output, batch*l.outputs);
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l.delta_gpu = cuda_make_array(l.delta, batch*l.outputs);
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#endif
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fprintf(stderr, "Detection Layer\n");
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srand(0);
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return l;
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}
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void forward_detection_layer(const detection_layer l, network_state state)
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{
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int locations = l.side*l.side;
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int i,j;
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memcpy(l.output, state.input, l.outputs*l.batch*sizeof(float));
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int b;
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if (l.softmax){
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for(b = 0; b < l.batch; ++b){
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int index = b*l.inputs;
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for (i = 0; i < locations; ++i) {
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int offset = i*l.classes;
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softmax_array(l.output + index + offset, l.classes,
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l.output + index + offset);
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}
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int offset = locations*l.classes;
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activate_array(l.output + index + offset, locations*l.n*(1+l.coords), LOGISTIC);
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}
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}
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if(state.train){
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float avg_iou = 0;
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float avg_cat = 0;
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float avg_allcat = 0;
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float avg_obj = 0;
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float avg_anyobj = 0;
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int count = 0;
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*(l.cost) = 0;
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int size = l.inputs * l.batch;
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memset(l.delta, 0, size * sizeof(float));
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for (b = 0; b < l.batch; ++b){
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int index = b*l.inputs;
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for (i = 0; i < locations; ++i) {
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int truth_index = (b*locations + i)*(1+l.coords+l.classes);
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int is_obj = state.truth[truth_index];
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for (j = 0; j < l.n; ++j) {
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int p_index = index + locations*l.classes + i*l.n + j;
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l.delta[p_index] = l.noobject_scale*(0 - l.output[p_index]);
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*(l.cost) += l.noobject_scale*pow(l.output[p_index], 2);
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avg_anyobj += l.output[p_index];
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}
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int best_index = -1;
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float best_iou = 0;
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float best_rmse = 20;
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if (!is_obj){
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continue;
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}
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int class_index = index + i*l.classes;
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for(j = 0; j < l.classes; ++j) {
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l.delta[class_index+j] = l.class_scale * (state.truth[truth_index+1+j] - l.output[class_index+j]);
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*(l.cost) += l.class_scale * pow(state.truth[truth_index+1+j] - l.output[class_index+j], 2);
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if(state.truth[truth_index + 1 + j]) avg_cat += l.output[class_index+j];
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avg_allcat += l.output[class_index+j];
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}
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box truth = float_to_box(state.truth + truth_index + 1 + l.classes);
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truth.x /= l.side;
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truth.y /= l.side;
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for(j = 0; j < l.n; ++j){
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int box_index = index + locations*(l.classes + l.n) + (i*l.n + j) * l.coords;
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box out = float_to_box(l.output + box_index);
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out.x /= l.side;
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out.y /= l.side;
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if (l.sqrt){
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out.w = out.w*out.w;
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out.h = out.h*out.h;
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}
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float iou = box_iou(out, truth);
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//iou = 0;
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float rmse = box_rmse(out, truth);
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if(best_iou > 0 || iou > 0){
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if(iou > best_iou){
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best_iou = iou;
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best_index = j;
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}
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}else{
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if(rmse < best_rmse){
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best_rmse = rmse;
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best_index = j;
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}
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}
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}
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if(l.forced){
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if(truth.w*truth.h < .1){
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best_index = 1;
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}else{
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best_index = 0;
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}
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}
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int box_index = index + locations*(l.classes + l.n) + (i*l.n + best_index) * l.coords;
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int tbox_index = truth_index + 1 + l.classes;
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box out = float_to_box(l.output + box_index);
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out.x /= l.side;
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out.y /= l.side;
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if (l.sqrt) {
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out.w = out.w*out.w;
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out.h = out.h*out.h;
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}
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float iou = box_iou(out, truth);
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//printf("%d", best_index);
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int p_index = index + locations*l.classes + i*l.n + best_index;
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*(l.cost) -= l.noobject_scale * pow(l.output[p_index], 2);
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*(l.cost) += l.object_scale * pow(1-l.output[p_index], 2);
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avg_obj += l.output[p_index];
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l.delta[p_index] = l.object_scale * (1.-l.output[p_index]);
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if(l.rescore){
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l.delta[p_index] = l.object_scale * (iou - l.output[p_index]);
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}
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l.delta[box_index+0] = l.coord_scale*(state.truth[tbox_index + 0] - l.output[box_index + 0]);
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l.delta[box_index+1] = l.coord_scale*(state.truth[tbox_index + 1] - l.output[box_index + 1]);
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l.delta[box_index+2] = l.coord_scale*(state.truth[tbox_index + 2] - l.output[box_index + 2]);
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l.delta[box_index+3] = l.coord_scale*(state.truth[tbox_index + 3] - l.output[box_index + 3]);
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if(l.sqrt){
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l.delta[box_index+2] = l.coord_scale*(sqrt(state.truth[tbox_index + 2]) - l.output[box_index + 2]);
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l.delta[box_index+3] = l.coord_scale*(sqrt(state.truth[tbox_index + 3]) - l.output[box_index + 3]);
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}
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*(l.cost) += pow(1-iou, 2);
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avg_iou += iou;
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++count;
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}
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if(l.softmax){
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gradient_array(l.output + index + locations*l.classes, locations*l.n*(1+l.coords),
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LOGISTIC, l.delta + index + locations*l.classes);
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}
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}
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printf("Detection Avg IOU: %f, Pos Cat: %f, All Cat: %f, Pos Obj: %f, Any Obj: %f, count: %d\n", avg_iou/count, avg_cat/count, avg_allcat/(count*l.classes), avg_obj/count, avg_anyobj/(l.batch*locations*l.n), count);
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}
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}
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void backward_detection_layer(const detection_layer l, network_state state)
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{
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axpy_cpu(l.batch*l.inputs, 1, l.delta, 1, state.delta, 1);
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}
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#ifdef GPU
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void forward_detection_layer_gpu(const detection_layer l, network_state state)
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{
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if(!state.train){
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copy_ongpu(l.batch*l.inputs, state.input, 1, l.output_gpu, 1);
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return;
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}
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float *in_cpu = calloc(l.batch*l.inputs, sizeof(float));
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float *truth_cpu = 0;
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if(state.truth){
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int num_truth = l.batch*l.side*l.side*(1+l.coords+l.classes);
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truth_cpu = calloc(num_truth, sizeof(float));
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cuda_pull_array(state.truth, truth_cpu, num_truth);
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}
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cuda_pull_array(state.input, in_cpu, l.batch*l.inputs);
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network_state cpu_state;
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cpu_state.train = state.train;
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cpu_state.truth = truth_cpu;
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cpu_state.input = in_cpu;
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forward_detection_layer(l, cpu_state);
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cuda_push_array(l.output_gpu, l.output, l.batch*l.outputs);
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cuda_push_array(l.delta_gpu, l.delta, l.batch*l.inputs);
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free(cpu_state.input);
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if(cpu_state.truth) free(cpu_state.truth);
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}
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void backward_detection_layer_gpu(detection_layer l, network_state state)
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{
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axpy_ongpu(l.batch*l.inputs, 1, l.delta_gpu, 1, state.delta, 1);
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//copy_ongpu(l.batch*l.inputs, l.delta_gpu, 1, state.delta, 1);
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}
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#endif
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