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/*
Copyright (c) by respective owners including Yahoo!, Microsoft, and
individual contributors. All rights reserved. Released under a BSD
license as described in the file LICENSE.
*/
#pragma once
#include <string>
#include "parse_primitives.h"
struct shared_data;
struct vw;
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(shared_data*, 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 getUnsafeUpdate(float prediction, float label, float eta_t, float norm) = 0;
virtual float getRevertingWeight(shared_data*, float prediction, float eta_t) = 0;
virtual float getSquareGrad(float prediction, float label) = 0;
virtual float first_derivative(shared_data*, float prediction, float label) = 0;
virtual float second_derivative(shared_data*, float prediction, float label) = 0;
virtual ~loss_function() {};
};
loss_function* getLossFunction(vw&, std::string funcName, float function_parameter = 0);
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