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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 <shogun/lib/common.h>
00015 #include <shogun/kernel/DotKernel.h>
00016 #include <shogun/features/Features.h>
00017 #include <shogun/features/DenseFeatures.h>
00018 
00019 namespace shogun
00020 {
00032 class CChi2Kernel: public CDotKernel
00033 {
00034     void init();
00035 
00036     public:
00038         CChi2Kernel();
00039 
00045         CChi2Kernel(int32_t size, float64_t width);
00046 
00054         CChi2Kernel( CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r,
00055                 float64_t width, int32_t size=10);
00056 
00057         virtual ~CChi2Kernel();
00058 
00065         virtual bool init(CFeatures* l, CFeatures* r);
00066 
00068         virtual float64_t get_width();
00069 
00074         static CChi2Kernel* obtain_from_generic(CKernel* kernel);
00075 
00080         virtual EKernelType get_kernel_type() { return K_CHI2; }
00081 
00086         virtual EFeatureClass get_feature_class() { return C_DENSE; }
00087 
00092         virtual EFeatureType get_feature_type() { return F_DREAL; }
00093 
00098         virtual const char* get_name() const { return "Chi2Kernel"; }
00099 
00100     protected:
00109         virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00110 
00111     protected:
00113         float64_t width;
00114 };
00115 }
00116 #endif /* _CHI2KERNEL_H__ */
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