Chi2Kernel.h

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00001 /*
00002  * This program is free software; you can redistribute it and/or modify
00003  * it under the terms of the GNU General Public License as published by
00004  * the Free Software Foundation; either version 3 of the License, or
00005  * (at your option) any later version.
00006  *
00007  * Written (W) 1999-2009 Soeren Sonnenburg
00008  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
00009  */
00010 
00011 #ifndef _CHI2KERNEL_H___
00012 #define _CHI2KERNEL_H___
00013 
00014 #include "lib/common.h"
00015 #include "kernel/SimpleKernel.h"
00016 #include "features/Features.h"
00017 #include "features/SimpleFeatures.h"
00018 
00019 namespace shogun
00020 {
00032 class CChi2Kernel: public CSimpleKernel<float64_t>
00033 {
00034     public:
00040         CChi2Kernel(int32_t size, float64_t width);
00041 
00049         CChi2Kernel(
00050             CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r, float64_t width, int32_t size);
00051 
00052         virtual ~CChi2Kernel();
00053 
00060         virtual bool init(CFeatures* l, CFeatures* r);
00061 
00066         virtual EKernelType get_kernel_type() { return K_CHI2; }
00067 
00072         virtual const char* get_name() const { return "Chi2"; }
00073 
00074     protected:
00083         virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00084 
00085     protected:
00087         float64_t width;
00088 };
00089 }
00090 #endif /* _CHI2KERNEL_H__ */
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