#include "network.h"
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#include "cost_layer.h"
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#include "utils.h"
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#include "parser.h"
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#ifdef OPENCV
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#include "opencv2/highgui/highgui_c.h"
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#endif
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typedef struct {
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float *x;
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float *y;
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} float_pair;
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float_pair get_rnn_data(char *text, int len, int batch, int steps)
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{
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float *x = calloc(batch * steps * 256, sizeof(float));
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float *y = calloc(batch * steps * 256, sizeof(float));
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int i,j;
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for(i = 0; i < batch; ++i){
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int index = rand() %(len - steps - 1);
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int done = 1;
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while(!done){
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index = rand() %(len - steps - 1);
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while(index < len-steps-1 && text[index++] != '\n');
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if (index < len-steps-1) done = 1;
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}
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for(j = 0; j < steps; ++j){
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x[(j*batch + i)*256 + text[index + j]] = 1;
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y[(j*batch + i)*256 + text[index + j + 1]] = 1;
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}
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}
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float_pair p;
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p.x = x;
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p.y = y;
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return p;
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}
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void train_char_rnn(char *cfgfile, char *weightfile, char *filename)
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{
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FILE *fp = fopen(filename, "r");
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//FILE *fp = fopen("data/ab.txt", "r");
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//FILE *fp = fopen("data/grrm/asoiaf.txt", "r");
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fseek(fp, 0, SEEK_END);
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size_t size = ftell(fp);
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fseek(fp, 0, SEEK_SET);
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char *text = calloc(size, sizeof(char));
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fread(text, 1, size, fp);
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fclose(fp);
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char *backup_directory = "/home/pjreddie/backup/";
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srand(time(0));
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data_seed = time(0);
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char *base = basecfg(cfgfile);
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fprintf(stderr, "%s\n", base);
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float avg_loss = -1;
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network net = parse_network_cfg(cfgfile);
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if(weightfile){
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load_weights(&net, weightfile);
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}
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fprintf(stderr, "Learning Rate: %g, Momentum: %g, Decay: %g\n", net.learning_rate, net.momentum, net.decay);
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int batch = net.batch;
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int steps = net.time_steps;
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int i = (*net.seen)/net.batch;
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clock_t time;
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while(get_current_batch(net) < net.max_batches){
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i += 1;
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time=clock();
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float_pair p = get_rnn_data(text, size, batch/steps, steps);
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float loss = train_network_datum(net, p.x, p.y) / (batch);
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free(p.x);
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free(p.y);
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if (avg_loss < 0) avg_loss = loss;
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avg_loss = avg_loss*.9 + loss*.1;
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fprintf(stderr, "%d: %f, %f avg, %f rate, %lf seconds\n", i, loss, avg_loss, get_current_rate(net), sec(clock()-time));
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if(i%100==0){
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char buff[256];
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sprintf(buff, "%s/%s_%d.weights", backup_directory, base, i);
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save_weights(net, buff);
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}
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if(i%10==0){
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char buff[256];
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sprintf(buff, "%s/%s.backup", backup_directory, base);
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save_weights(net, buff);
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}
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}
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char buff[256];
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sprintf(buff, "%s/%s_final.weights", backup_directory, base);
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save_weights(net, buff);
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}
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void test_char_rnn(char *cfgfile, char *weightfile, int num, char *seed, float temp, int rseed)
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{
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srand(rseed);
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char *base = basecfg(cfgfile);
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fprintf(stderr, "%s\n", base);
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network net = parse_network_cfg(cfgfile);
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if(weightfile){
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load_weights(&net, weightfile);
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}
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int i, j;
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for(i = 0; i < net.n; ++i) net.layers[i].temperature = temp;
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char c;
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int len = strlen(seed);
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float *input = calloc(256, sizeof(float));
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for(i = 0; i < len-1; ++i){
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c = seed[i];
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input[(int)c] = 1;
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network_predict(net, input);
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input[(int)c] = 0;
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printf("%c", c);
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}
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c = seed[len-1];
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for(i = 0; i < num; ++i){
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printf("%c", c);
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float r = rand_uniform(0,1);
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float sum = 0;
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input[(int)c] = 1;
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float *out = network_predict(net, input);
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input[(int)c] = 0;
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for(j = 0; j < 256; ++j){
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sum += out[j];
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if(sum > r) break;
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}
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c = j;
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}
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printf("\n");
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}
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void valid_char_rnn(char *cfgfile, char *weightfile, char *filename)
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{
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FILE *fp = fopen(filename, "r");
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//FILE *fp = fopen("data/ab.txt", "r");
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//FILE *fp = fopen("data/grrm/asoiaf.txt", "r");
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fseek(fp, 0, SEEK_END);
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size_t size = ftell(fp);
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fseek(fp, 0, SEEK_SET);
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char *text = calloc(size, sizeof(char));
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fread(text, 1, size, fp);
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fclose(fp);
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char *base = basecfg(cfgfile);
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fprintf(stderr, "%s\n", base);
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network net = parse_network_cfg(cfgfile);
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if(weightfile){
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load_weights(&net, weightfile);
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}
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int i;
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char c;
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float *input = calloc(256, sizeof(float));
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float sum = 0;
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for(i = 0; i < size-1; ++i){
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c = text[i];
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input[(int)c] = 1;
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float *out = network_predict(net, input);
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input[(int)c] = 0;
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sum += log(out[(int)text[i+1]]);
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}
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printf("Log Probability: %f\n", sum);
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}
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void run_char_rnn(int argc, char **argv)
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{
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if(argc < 4){
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fprintf(stderr, "usage: %s %s [train/test/valid] [cfg] [weights (optional)]\n", argv[0], argv[1]);
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return;
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}
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char *filename = find_char_arg(argc, argv, "-file", "data/shakespeare.txt");
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char *seed = find_char_arg(argc, argv, "-seed", "\n");
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int len = find_int_arg(argc, argv, "-len", 100);
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float temp = find_float_arg(argc, argv, "-temp", 1);
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int rseed = find_int_arg(argc, argv, "-srand", time(0));
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char *cfg = argv[3];
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char *weights = (argc > 4) ? argv[4] : 0;
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if(0==strcmp(argv[2], "train")) train_char_rnn(cfg, weights, filename);
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else if(0==strcmp(argv[2], "valid")) valid_char_rnn(cfg, weights, filename);
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else if(0==strcmp(argv[2], "test")) test_char_rnn(cfg, weights, len, seed, temp, rseed);
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}
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