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LinearARDKernel.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  * (W) 2012 Jacob Walker
00008  *
00009  * Adapted from WeightedDegreeRBFKernel.h
00010  */
00011 
00012 #ifndef LINEARARDKERNEL_H_
00013 #define LINEARARDKERNEL_H_
00014 
00015 #include <shogun/lib/common.h>
00016 #include <shogun/kernel/DotKernel.h>
00017 #include <shogun/features/DenseFeatures.h>
00018 
00019 namespace shogun
00020 {
00021 
00023 class CLinearARDKernel: public CDotKernel
00024 {
00025 public:
00027     CLinearARDKernel();
00028 
00033     CLinearARDKernel(int32_t size);
00034 
00041     CLinearARDKernel(CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r,
00042             int32_t size=10);
00043 
00044     virtual ~CLinearARDKernel();
00045 
00052     virtual bool init(CFeatures* l, CFeatures* r);
00053 
00058     virtual EKernelType get_kernel_type() { return K_LINEARARD; }
00059 
00064     virtual const char* get_name() const { return "LinearARDKernel"; }
00065 
00070     virtual EFeatureClass get_feature_class() { return C_DENSE; }
00071 
00076     virtual EFeatureType get_feature_type() { return F_DREAL; }
00077 
00083     virtual void set_weight(float64_t w, index_t i);
00084 
00091     virtual float64_t get_weight(index_t i);
00092 
00094     virtual SGVector<float64_t> get_weights() { return m_weights; }
00095 
00100     virtual void set_weights(SGVector<float64_t> weights) { m_weights=weights; }
00101 
00102 protected:
00111     virtual float64_t compute(int32_t idx_a, int32_t idx_b);
00112 
00117     void init_ft_weights();
00118 
00126     virtual SGMatrix<float64_t> get_parameter_gradient(const TParameter* param,
00127             index_t index=-1);
00128 
00129 private:
00130     void init();
00131 
00132 protected:
00134     SGVector<float64_t> m_weights;
00135 };
00136 }
00137 #endif /* LINEARARDKERNEL_H_ */
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