darknet/src/utils.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <float.h>
#include <limits.h>

#include "utils.h"

void pm(int M, int N, float *A)
{
    int i,j;
    for(i =0 ; i < M; ++i){
        printf("%d ", i+1);
        for(j = 0; j < N; ++j){
            printf("%10.6f, ", A[i*N+j]);
        }
        printf("\n");
    }
    printf("\n");
}


char *find_replace(char *str, char *orig, char *rep)
{
    static char buffer[4096];
    char *p;

    if(!(p = strstr(str, orig)))  // Is 'orig' even in 'str'?
        return str;

    strncpy(buffer, str, p-str); // Copy characters from 'str' start to 'orig' st$
    buffer[p-str] = '\0';

    sprintf(buffer+(p-str), "%s%s", rep, p+strlen(orig));

    return buffer;
}

float sec(clock_t clocks)
{
    return (float)clocks/CLOCKS_PER_SEC;
}

void top_k(float *a, int n, int k, int *index)
{
    int i,j;
    for(j = 0; j < k; ++j) index[j] = 0;
    for(i = 0; i < n; ++i){
        int curr = i;
        for(j = 0; j < k; ++j){
            if(a[curr] > a[index[j]]){
                int swap = curr;
                curr = index[j];
                index[j] = swap;
            }
        }
    }
}

void error(const char *s)
{
    perror(s);
    exit(0);
}

void malloc_error()
{
    fprintf(stderr, "Malloc error\n");
    exit(-1);
}

void file_error(char *s)
{
    fprintf(stderr, "Couldn't open file: %s\n", s);
    exit(0);
}

list *split_str(char *s, char delim)
{
    size_t i;
    size_t len = strlen(s);
    list *l = make_list();
    list_insert(l, s);
    for(i = 0; i < len; ++i){
        if(s[i] == delim){
            s[i] = '\0';
            list_insert(l, &(s[i+1]));
        }
    }
    return l;
}

void strip(char *s)
{
    size_t i;
    size_t len = strlen(s);
    size_t offset = 0;
    for(i = 0; i < len; ++i){
        char c = s[i];
        if(c==' '||c=='\t'||c=='\n') ++offset;
        else s[i-offset] = c;
    }
    s[len-offset] = '\0';
}

void strip_char(char *s, char bad)
{
    size_t i;
    size_t len = strlen(s);
    size_t offset = 0;
    for(i = 0; i < len; ++i){
        char c = s[i];
        if(c==bad) ++offset;
        else s[i-offset] = c;
    }
    s[len-offset] = '\0';
}

char *fgetl(FILE *fp)
{
    if(feof(fp)) return 0;
    size_t size = 512;
    char *line = malloc(size*sizeof(char));
    if(!fgets(line, size, fp)){
        free(line);
        return 0;
    }

    size_t curr = strlen(line);

    while((line[curr-1] != '\n') && !feof(fp)){
        if(curr == size-1){
            size *= 2;
            line = realloc(line, size*sizeof(char));
            if(!line) {
                printf("%ld\n", size);
                malloc_error();
            }
        }
        size_t readsize = size-curr;
        if(readsize > INT_MAX) readsize = INT_MAX-1;
        fgets(&line[curr], readsize, fp);
        curr = strlen(line);
    }
    if(line[curr-1] == '\n') line[curr-1] = '\0';

    return line;
}

char *copy_string(char *s)
{
    char *copy = malloc(strlen(s)+1);
    strncpy(copy, s, strlen(s)+1);
    return copy;
}

list *parse_csv_line(char *line)
{
    list *l = make_list();
    char *c, *p;
    int in = 0;
    for(c = line, p = line; *c != '\0'; ++c){
        if(*c == '"') in = !in;
        else if(*c == ',' && !in){
            *c = '\0';
            list_insert(l, copy_string(p));
            p = c+1;
        }
    }
    list_insert(l, copy_string(p));
    return l;
}

int count_fields(char *line)
{
    int count = 0;
    int done = 0;
    char *c;
    for(c = line; !done; ++c){
        done = (*c == '\0');
        if(*c == ',' || done) ++count;
    }
    return count;
}

float *parse_fields(char *line, int n)
{
    float *field = calloc(n, sizeof(float));
    char *c, *p, *end;
    int count = 0;
    int done = 0;
    for(c = line, p = line; !done; ++c){
        done = (*c == '\0');
        if(*c == ',' || done){
            *c = '\0';
            field[count] = strtod(p, &end);
            if(p == c) field[count] = nan("");
            if(end != c && (end != c-1 || *end != '\r')) field[count] = nan(""); //DOS file formats!
            p = c+1;
            ++count;
        }
    }
    return field;
}

float sum_array(float *a, int n)
{
    int i;
    float sum = 0;
    for(i = 0; i < n; ++i) sum += a[i];
    return sum;
}

float mean_array(float *a, int n)
{
    return sum_array(a,n)/n;
}

float variance_array(float *a, int n)
{
    int i;
    float sum = 0;
    float mean = mean_array(a, n);
    for(i = 0; i < n; ++i) sum += (a[i] - mean)*(a[i]-mean);
    float variance = sum/n;
    return variance;
}

float constrain(float a, float max)
{
    if(a > abs(max)) return abs(max);
    if(a < -abs(max)) return -abs(max);
    return a;
}

float mse_array(float *a, int n)
{
    int i;
    float sum = 0;
    for(i = 0; i < n; ++i) sum += a[i]*a[i];
    return sqrt(sum/n);
}

void normalize_array(float *a, int n)
{
    int i;
    float mu = mean_array(a,n);
    float sigma = sqrt(variance_array(a,n));
    for(i = 0; i < n; ++i){
        a[i] = (a[i] - mu)/sigma;
    }
    mu = mean_array(a,n);
    sigma = sqrt(variance_array(a,n));
}

void translate_array(float *a, int n, float s)
{
    int i;
    for(i = 0; i < n; ++i){
        a[i] += s;
    }
}

float mag_array(float *a, int n)
{
    int i;
    float sum = 0;
    for(i = 0; i < n; ++i){
        sum += a[i]*a[i];   
    }
    return sqrt(sum);
}

void scale_array(float *a, int n, float s)
{
    int i;
    for(i = 0; i < n; ++i){
        a[i] *= s;
    }
}

int max_index(float *a, int n)
{
    if(n <= 0) return -1;
    int i, max_i = 0;
    float max = a[0];
    for(i = 1; i < n; ++i){
        if(a[i] > max){
            max = a[i];
            max_i = i;
        }
    }
    return max_i;
}

// From http://en.wikipedia.org/wiki/Box%E2%80%93Muller_transform
#define TWO_PI 6.2831853071795864769252866
float rand_normal()
{
    static int haveSpare = 0;
    static double rand1, rand2;

    if(haveSpare)
    {
        haveSpare = 0;
        return sqrt(rand1) * sin(rand2);
    }

    haveSpare = 1;

    rand1 = rand() / ((double) RAND_MAX);
    if(rand1 < 1e-100) rand1 = 1e-100;
    rand1 = -2 * log(rand1);
    rand2 = (rand() / ((double) RAND_MAX)) * TWO_PI;

    return sqrt(rand1) * cos(rand2);
}

/*
   float rand_normal()
   {
   int n = 12;
   int i;
   float sum= 0;
   for(i = 0; i < n; ++i) sum += (float)rand()/RAND_MAX;
   return sum-n/2.;
   }
 */

float rand_uniform()
{
    return (float)rand()/RAND_MAX;
}

float **one_hot_encode(float *a, int n, int k)
{
    int i;
    float **t = calloc(n, sizeof(float*));
    for(i = 0; i < n; ++i){
        t[i] = calloc(k, sizeof(float));
        int index = (int)a[i];
        t[i][index] = 1;
    }
    return t;
}