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/DotKernel.h"
00016 #include "features/Features.h"
00017 #include "features/SimpleFeatures.h"
00018 
00019 namespace shogun
00020 {
00032 class CChi2Kernel: public CDotKernel
00033 {
00034     void init(void);
00035 
00036     public:
00038         CChi2Kernel(void);
00039 
00045         CChi2Kernel(int32_t size, float64_t width);
00046 
00054         CChi2Kernel(
00055             CSimpleFeatures<float64_t>* l, CSimpleFeatures<float64_t>* r, float64_t width, int32_t size);
00056 
00057         virtual ~CChi2Kernel();
00058 
00065         virtual bool init(CFeatures* l, CFeatures* r);
00066 
00071         virtual EKernelType get_kernel_type() { return K_CHI2; }
00072 
00077         inline virtual EFeatureClass get_feature_class() { return C_SIMPLE; }
00078 
00083         virtual EFeatureType get_feature_type() { return F_DREAL; }
00084 
00089         virtual const char* get_name() const { return "Chi2"; }
00090 
00091     protected:
00100         virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00101 
00102     protected:
00104         float64_t width;
00105 };
00106 }
00107 #endif /* _CHI2KERNEL_H__ */
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