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#include "SOGP_aux.h"
#include <string.h>
//Basic cascades - Not efficient
ReturnMatrix SOGPKernel::kernelM(const ColumnVector& in, const Matrix &BV){
ColumnVector k(BV.Ncols());
for(int i=1;i<=BV.Ncols();i++)
{
Matrix BVCol = BV.Column(i);
k(i)=kernel(in,BVCol);
}
k.Release();
return k;
}
double SOGPKernel::kstar(const ColumnVector& in){
return kernel(in,in);
}
double SOGPKernel::kstar(){
ColumnVector foo(1);
foo(1)=0;
return kernel(foo,foo);
}
//RBF
double RBFKernel::kernel(const ColumnVector &a, const ColumnVector &b){
double d = a.Nrows();
if(d!=widths.Ncols())
{//Expand if necessary
//printf("RBFKernel: Resizing width to %d\n",(int)d);
double wtmp=widths(1);
RowVector newWidths(d);
for(int i=1;i<=widths.Ncols();i++) newWidths(i) = widths(i);
for(int i=widths.Ncols();i<=d;i++) newWidths(i) = wtmp;
widths = newWidths;
}
//I think this bumps up against numerical stability issues.
Matrix c = a-b;
Real ss = SumSquare(SP(c,widths.t()));
return A*exp(-(1/(2*d)) * ss);
}
//POL
double POLKernel::kernel(const ColumnVector &a, const ColumnVector &b){
double d = a.Nrows();
double resp=1;
double inner = (a.t()*b).AsScalar();
for(int i=1;i<=scales.Ncols();i++)
resp += pow((inner/(d*scales(i))),i);
return resp;
}
//POLY
double POLYKernel::kernel(const ColumnVector &a, const ColumnVector &b){
double d = a.Nrows();
double resp=1;
double inner = (a.t()*b).AsScalar() + offset;
resp = pow(inner, degree);
return resp;
}
//-------------------------------------------------------------
//Newmat printers
void printScalar(double value, FILE *fp,const char *name,bool ascii){
if(name) fprintf(fp,"%s ",name);
if(ascii) fprintf(fp,"%lf ",value);
else fwrite(&value,sizeof(double),1,fp);
fprintf(fp,"\n");
}
void readScalar(double &value,FILE *fp,const char *name,bool ascii){
if(name)
{
char tn[128];//bad
fscanf(fp,"%s ",tn);
if(strcmp(tn,name)) printf("readRV: Expected '%s', got '%s'\n",name,tn);
}
if(ascii) fscanf(fp,"%lf ",&value);
else fread(&(value),sizeof(double),1,fp);
fscanf(fp,"\n");
}
void printRV(RowVector rv,FILE *fp,const char *name,bool ascii){
if(name) fprintf(fp,"%s ",name);
fprintf(fp,"%d:",rv.Ncols());
for(int i=0;i<rv.Ncols();i++)
{
if(ascii) fprintf(fp,"%lf ",rv(i+1));
else fwrite(&rv(i+1),sizeof(double),1,fp);
}
fprintf(fp,"\n");
}
void readRV(RowVector &rv,FILE *fp,const char *name,bool ascii){
if(name)
{
char tn[128];//bad
fscanf(fp,"%s ",tn);
if(strcmp(tn,name)) printf("readRV: Expected '%s', got '%s'\n",name,tn);
}
int len;
fscanf(fp,"%d:",&len);
rv.ReSize(len);
for(int i=0;i<rv.Ncols();i++)
{
if(ascii) fscanf(fp,"%lf ",&rv(i+1));
else fread(&(rv(i+1)),sizeof(double),1,fp);
}
fscanf(fp,"\n");
}
void printCV(ColumnVector cv,FILE *fp,const char *name,bool ascii){
printRV(cv.t(),fp,name,ascii);
}
void readCV(ColumnVector &cv,FILE *fp,const char *name,bool ascii){
RowVector rv;
readRV(rv,fp,name,ascii);
cv=rv.t();
}
void printMatrix(Matrix m,FILE *fp,const char *name,bool ascii){
if(name) fprintf(fp,"%s ",name);
fprintf(fp,"(%d:%d)",m.Nrows(),m.Ncols());
for(int i=0;i<m.Nrows();i++)
{
for(int j=0;j<m.Ncols();j++)
{
if(ascii) fprintf(fp,"%lf ",m(i+1,j+1));
else fwrite(&(m(i+1,j+1)),sizeof(double),1,fp);
}
if(ascii)fprintf(fp,"\n");
}
if(ascii)fprintf(fp,"\n");
}
void readMatrix(Matrix &m,FILE *fp,const char *name,bool ascii){
if(name){
char tn[128];
fscanf(fp,"%s ",tn);
if(strcmp(tn,name))
printf("readMatrix: Expected '%s', got '%s'\n",name,tn);
}
int wid,hgt;
fscanf(fp,"(%d:%d)",&wid,&hgt);
m.ReSize(wid,hgt);
for(int i=0;i<m.Nrows();i++){
for(int j=0;j<m.Ncols();j++){
if(ascii)
fscanf(fp,"%lf ",&m(i+1,j+1));
else
fread(&(m(i+1,j+1)),sizeof(double),1,fp);
}
if(ascii)fscanf(fp,"\n");
}
if(ascii)fscanf(fp,"\n");
}
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