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/*
Copyright (c) 2009 Yahoo! Inc. All rights reserved. The copyrights
embodied in the content of this file are licensed under the BSD
(revised) open source license
*/
#ifndef LOSSFUNCTIONS_H_
#define LOSSFUNCTIONS_H_
#include <string>
using namespace std;
class loss_function {
public :
/*
* getLoss evaluates the example loss.
* The function returns the loss value
*/
//virtual float getLoss(example *&ec, gd_vars &vars) = 0;
virtual float getLoss(float prediction, float label) = 0;
/*
* getUpdate evaluates the update scalar
* The function return the update scalar
*/
virtual float getUpdate(float prediction, float label, float eta_t, float norm) = 0;
virtual float getRevertingWeight(float prediction, float eta_t) = 0;
virtual float getSquareGrad(float prediction, float label) = 0;
virtual float first_derivative(float prediction, float label) = 0;
virtual float second_derivative(float prediction, float label) = 0;
virtual ~loss_function() {};
};
loss_function* getLossFunction(string funcName, double loss_parameter = 0);
#endif /* LOSSFUNCTIONS_H_ */
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