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/*-----------------------------------------------------------------------
* ocas_helper.c: Implementation of helper functions for the OCAS solver.
*
* It supports both sparse and dense matrices and loading data from
* the SVM^light format.
*-------------------------------------------------------------------- */
#define _FILE_OFFSET_BITS 64
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <sys/time.h>
#include <stdlib.h>
#include <time.h>
#include "libocas.h"
#include "ocas_helper.h"
/*----------------------------------------------------------------------
full_bool_compute_output( output ) does the follwing:
output = data_X'*W;
----------------------------------------------------------------------*/
int full_bool_compute_output( double *output, void* user_data )
{
uint32_t i, j, k, dataDim; /* k is new index for the vector W */
double tmp;
uint8_t* ptr;
ptr = (uint8_t*)mxGetPr( data_X );
dataDim = nDim/8;
for(i=0; i < nData; i++) {
tmp = X0*W0;
k = 0;
for(j=0; j < dataDim; j++ ) {
if (ptr[LIBOCAS_INDEX(j,i,dataDim)] & 0x01) {
tmp += W[k];
}
k++;
if (ptr[LIBOCAS_INDEX(j,i,dataDim)] & 0x02) {
tmp += W[k];
}
k++;
if (ptr[LIBOCAS_INDEX(j,i,dataDim)] & 0x04) {
tmp += W[k];
}
k++;
if (ptr[LIBOCAS_INDEX(j,i,dataDim)] & 0x08) {
tmp += W[k];
}
k++;
if (ptr[LIBOCAS_INDEX(j,i,dataDim)] & 0x10) {
tmp += W[k];
}
k++;
if (ptr[LIBOCAS_INDEX(j,i,dataDim)] & 0x20) {
tmp += W[k];
}
k++;
if (ptr[LIBOCAS_INDEX(j,i,dataDim)] & 0x40) {
tmp += W[k];
}
k++;
if (ptr[LIBOCAS_INDEX(j,i,dataDim)] & 0x80) {
tmp += W[k];
}
k++;
}
output[i] = tmp*data_y[i];
}
return 0;
}
/*----------------------------------------------------------------------------------
full_bool_add_new_cut( new_col_H, new_cut, cut_length, nSel ) does the following:
new_a = sum(data_X(:,find(new_cut ~=0 )),2);
new_col_H = [full_A(:,1:nSel)'*new_a ; new_a'*new_a];
full_A(:,nSel+1) = new_a;
---------------------------------------------------------------------------------*/
int full_bool_add_new_cut( double *new_col_H,
uint32_t *new_cut,
uint32_t cut_length,
uint32_t nSel,
void* user_data)
{
/*****************************/
double sq_norm_a;
uint32_t i, j, k, dataDim; /* k is new index for the vector a*/
uint8_t *ptr;
ptr = (uint8_t*)mxGetPr(data_X);
dataDim = nDim/8;
memset(new_a, 0, sizeof(double)*nDim);
for(i=0; i < cut_length; i++) {
k = 0;
for(j=0; j < dataDim; j++ ) {
if (ptr[LIBOCAS_INDEX(j,new_cut[i],dataDim)] & 0x01) {
new_a[k] += data_y[new_cut[i]];
}
k++;
if (ptr[LIBOCAS_INDEX(j,new_cut[i],dataDim)] & 0x02) {
new_a[k] += data_y[new_cut[i]];
}
k++;
if (ptr[LIBOCAS_INDEX(j,new_cut[i],dataDim)] & 0x04) {
new_a[k] += data_y[new_cut[i]];
}
k++;
if (ptr[LIBOCAS_INDEX(j,new_cut[i],dataDim)] & 0x08) {
new_a[k] += data_y[new_cut[i]];
}
k++;
if (ptr[LIBOCAS_INDEX(j,new_cut[i],dataDim)] & 0x10) {
new_a[k] += data_y[new_cut[i]];
}
k++;
if (ptr[LIBOCAS_INDEX(j,new_cut[i],dataDim)] & 0x20) {
new_a[k] += data_y[new_cut[i]];
}
k++;
if (ptr[LIBOCAS_INDEX(j,new_cut[i],dataDim)] & 0x40) {
new_a[k] += data_y[new_cut[i]];
}
k++;
if (ptr[LIBOCAS_INDEX(j,new_cut[i],dataDim)] & 0x80) {
new_a[k] += data_y[new_cut[i]];
}
k++;
}
A0[nSel] += X0*data_y[new_cut[i]];
}
/*****************************/
/* compute new_a'*new_a and insert new_a to the last column of full_A */
sq_norm_a = A0[nSel]*A0[nSel];
for(j=0; j < nDim; j++ ) {
sq_norm_a += new_a[j]*new_a[j];
full_A[LIBOCAS_INDEX(j,nSel,nDim)] = new_a[j];
}
new_col_H[nSel] = sq_norm_a;
for(i=0; i < nSel; i++) {
double tmp = A0[nSel]*A0[i];
for(j=0; j < nDim; j++ ) {
tmp += new_a[j]*full_A[LIBOCAS_INDEX(j,i,nDim)];
}
new_col_H[i] = tmp;
}
/* mxFree( new_a );*/
return 0;
}
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