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#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "get_local_scores.h"
#include "ls_LOO.h"
extern int* nof_vals;
extern int N;
static score_t ess;
static int splitess;
static int* freq2mem = NULL;
static int* freq2mem2 = NULL;
static int nof_freq2s;
#define BIG_LOO_DATA (1<<10)
/* LOO */
score_t big_loo_score(int i, varset_t psi, int nof_freqs){
int vc_v = nof_vals[i];
score_t pcc = get_nof_cfgs(psi);
score_t ess_per_pcc = splitess ? (ess / pcc) : (ess*vc_v);
score_t ess_per_cc = splitess ? (ess_per_pcc / vc_v) : ess;
int* freqp = freqmem;
int* end_freqp = freqp + nof_freqs * vc_v;
score_t res = - log(N);
memset(freq2mem, 0, nof_freq2s*sizeof(int)); /* could reset later */
memset(freq2mem2, 0, nof_freq2s*sizeof(int)); /* could reset later */
for(;freqp < end_freqp; freqp += vc_v) {
int pcfreq = 0;
int v;
for(v = 0; v<vc_v; ++v) {
int freq = freqp[v];
if (freq) {
pcfreq += freq;
if(freq<nof_freq2s){
++freq2mem[freq];
} else {
res += freq * log(ess_per_cc + freq - 1);
}
}
}
if(pcfreq<nof_freq2s){
++freq2mem2[pcfreq];
} else {
res -= pcfreq * log(ess_per_pcc + pcfreq);
}
}
{
int i;
for(i=1;i<nof_freq2s;++i){
int freq2 = freq2mem[i];
if(freq2) res += freq2 * i * log(ess_per_cc + i - 1);
}
for(i=1;i<nof_freq2s;++i){
int freq2 = freq2mem2[i];
if(freq2) res -= freq2 * i * log(ess_per_pcc + i);
}
}
return res > 0.0 ? 0.0 : res;
}
score_t loo_score(int i, varset_t psi, int nof_freqs){
int vc_v = nof_vals[i];
score_t pcc = get_nof_cfgs(psi);
score_t ess_per_pcc = splitess ? (ess / pcc) : (ess*vc_v);
score_t ess_per_cc = splitess ? (ess_per_pcc / vc_v) : ess;
int* freqp = freqmem;
int* end_freqp = freqp + nof_freqs * vc_v;
score_t res = -log(N);
memset(freq2mem, 0, nof_freq2s*sizeof(int)); /* could reset later */
memset(freq2mem2, 0, nof_freq2s*sizeof(int)); /* could reset later */
for(;freqp < end_freqp; freqp += vc_v) {
int pcfreq = 0;
int v;
for(v = 0; v<vc_v; ++v) {
int freq = freqp[v];
if (freq) {
pcfreq += freq;
++freq2mem[freq];
}
}
++freq2mem2[pcfreq];
}
{
int i;
for(i=1;i<nof_freq2s;++i){
int freq2 = freq2mem[i];
if(freq2) res += freq2 * i * log(ess_per_cc + i - 1);
}
for(i=1;i<nof_freq2s;++i){
int freq2 = freq2mem2[i];
if(freq2) res -= freq2 * i * log(ess_per_pcc + i);
}
}
return res > 0.0 ? 0.0 : res;
}
scorefun init_LOO_scorer(char* arg){
scorefun sf;
int arglen = strlen(arg);
ess = atof(arg);
splitess = arg[arglen-1] == 'l';
if (N<BIG_LOO_DATA){
sf = loo_score;
nof_freq2s = N+1;
} else {
sf = big_loo_score;
nof_freq2s = BIG_LOO_DATA;
}
freq2mem = malloc(nof_freq2s * sizeof(int));
freq2mem2 = malloc(nof_freq2s * sizeof(int));
return sf;
}
void free_LOO_scorer(){
if(freq2mem) free(freq2mem);
if(freq2mem2) free(freq2mem2);
}
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