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Functions.h
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/*
#-------------------------------------------------------------------------------
# Copyright (c) 2012 Daniel <dgrat> Frenzel.
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the GNU Lesser Public License v2.1
# which accompanies this distribution, and is available at
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
#
# Contributors:
# Daniel <dgrat> Frenzel - initial API and implementation
#-------------------------------------------------------------------------------
*/
#ifndef TRANSFERFUNCTIONS_H_
#define TRANSFERFUNCTIONS_H_
#ifndef SWIG
#include <cmath>
#include <stdio.h>
#include <string.h>
#endif
#define PI 3.14159265358979323846f
typedef float (*pDistanceFu) (float, float);
typedef float (*pDecayFu) (float, float, float);
//////////////////////////////////////////////////////////////////////////////////////////////
/*
* Distance functions for self organizing maps
*/
//////////////////////////////////////////////////////////////////////////////////////////////
#ifdef __CUDACC__
__host__ __device__
#endif
inline float
fcn_bubble_nhood (float dist, float sigmaT) {
if(dist < sigmaT)
return 1.f;
else return 0.f;
}
//////////////////////////////////////////////////////////////////////////////////////////////
#ifdef __CUDACC__
__host__ __device__
#endif
inline float
fcn_gaussian_nhood (float dist, float sigmaT) {
return exp(-pow(dist, 2.f)/(2.f*pow(sigmaT, 2.f)));
}
//////////////////////////////////////////////////////////////////////////////////////////////
#ifdef __CUDACC__
__host__ __device__
#endif
inline float
fcn_cutgaussian_nhood (float dist, float sigmaT) {
if(dist < sigmaT)
return exp(-pow(dist, 2.f)/(2.f*pow(sigmaT, 2.f)));
else return 0.f;
}
//////////////////////////////////////////////////////////////////////////////////////////////
#ifdef __CUDACC__
__host__ __device__
#endif
inline float
fcn_mexican_nhood (float dist, float sigmaT) {
return 2.f/(sqrt(3.f * sigmaT) * pow(PI, 0.25f) ) *
(1.f-pow(dist, 2.f) / pow(sigmaT, 2.f) ) *
fcn_gaussian_nhood(dist, sigmaT);
}
//////////////////////////////////////////////////////////////////////////////////////////////
#ifdef __CUDACC__
__host__ __device__
#endif
inline float
fcn_epanechicov_nhood (float dist, float sigmaT) {
float fVal = 1 - pow(dist/sigmaT, 2.f);
if(fVal > 0)
return fVal;
else return 0.f;
}
//////////////////////////////////////////////////////////////////////////////////////////////
#ifdef __CUDACC__
__host__ __device__
#endif
inline float
fcn_rad_decay (float sigma0, float T, float lambda) {
return std::floor(sigma0*exp(-T/lambda) + 0.5f);
}
//////////////////////////////////////////////////////////////////////////////////////////////
#ifdef __CUDACC__
__host__ __device__
#endif
inline float
fcn_lrate_decay (float sigma0, float T, float lambda) {
return sigma0*exp(-T/lambda);
}
/**
* @class DistFunction
* @brief Represents a neighborhood and decay function.
* Consists of a distance and a decay function.
* Normally just the neighborhood function is free to be changed.
*/
typedef float (*pDistanceFu) (float, float);
typedef float (*pDecayFu) (float, float, float);
template <pDistanceFu Dist, pDecayFu Rad, pDecayFu LRate>
class DistFunction {
public:
DistFunction() {}
DistFunction(const char *cstr) : name(cstr) {};
const char *name;
#ifdef __CUDACC__
__host__ __device__
#endif
static float distance(float a, float b) { return Dist(a,b); };
#ifdef __CUDACC__
__host__ __device__
#endif
static float rad_decay(float a, float b, float c) { return Rad(a,b,c); };
#ifdef __CUDACC__
__host__ __device__
#endif
static float lrate_decay(float a, float b, float c) { return LRate(a,b,c); };
};
void test();
#endif /* TRANSFERFUNCTIONS_H_ */