SquaredHingeLoss.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) 2011 Shashwat Lal Das
00008  * Copyright (c) 2011 Berlin Institute of TechnosquaredHingey and Max-Planck-Society.
00009  */
00010 
00011 #ifndef _SQUAREDHINGELOSS_H__
00012 #define _SQUAREDHINGELOSS_H__
00013 
00014 #include <shogun/loss/LossFunction.h>
00015 
00016 namespace shogun
00017 {
00021 class CSquaredHingeLoss: public CLossFunction
00022 {
00023 public:
00027     CSquaredHingeLoss(): CLossFunction() {};
00028 
00032     ~CSquaredHingeLoss() {};
00033 
00042     float64_t loss(float64_t prediction, float64_t label);
00043 
00052     virtual float64_t first_derivative(float64_t prediction, float64_t label);
00053 
00062     virtual float64_t second_derivative(float64_t prediction, float64_t label);
00063 
00074     virtual float64_t get_update(float64_t prediction, float64_t label, float64_t eta_t, float64_t norm);
00075 
00084     virtual float64_t get_square_grad(float64_t prediction, float64_t label);
00085 
00091     virtual ELossType get_loss_type() { return L_SQUAREDHINGELOSS; }
00092 
00098     virtual const char* get_name() const { return "SquaredHingeLoss"; }
00099 };
00100 
00101 }
00102 
00103 #endif // _SQUAREDHINGELOSS_H__
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