hingeloss Class Reference

Inheritance diagram for hingeloss:

Public Member Functions
std::string	getType ()
float	getLoss (shared_data *, float prediction, float label)
float	getUpdate (float prediction, float label, float update_scale, float pred_per_update)
float	getUnsafeUpdate (float prediction, float label, float update_scale)
float	getRevertingWeight (shared_data *, float prediction, float eta_t)
float	getSquareGrad (float prediction, float label)
float	first_derivative (shared_data *, float prediction, float label)
float	second_derivative (shared_data *, float, float)
Public Member Functions inherited from loss_function
virtual	~loss_function ()

Detailed Description

Definition at line 116 of file loss_functions.cc.

Member Function Documentation

first_derivative()

float hingeloss::first_derivative ( shared_data *  , float  prediction, float  label  )

inlinevirtual

Implements loss_function.

Definition at line 152 of file loss_functions.cc.

{ return (label * prediction >= 1) ? 0 : -label; }

getLoss()

float hingeloss::getLoss ( shared_data *  , float  prediction, float  label  )

inlinevirtual

Implements loss_function.

Definition at line 121 of file loss_functions.cc.

References f.

  {
    if (label != -1.f && label != 1.f)
      std::cout << "You are using label " << label << " not -1 or 1 as loss function expects!" << std::endl;
    float e = 1 - label * prediction;
    return (e > 0) ? e : 0;
  }

getRevertingWeight()

float hingeloss::getRevertingWeight ( shared_data *  , float  prediction, float  eta_t  )

inlinevirtual

Implements loss_function.

Definition at line 144 of file loss_functions.cc.

{ return fabs(prediction) / eta_t; }

getSquareGrad()

float hingeloss::getSquareGrad ( float  prediction, float  label  )

inlinevirtual

Implements loss_function.

Definition at line 146 of file loss_functions.cc.

References squaredloss::first_derivative().

  {
    float d = first_derivative(nullptr, prediction, label);
    return d * d;
  }

getType()

std::string hingeloss::getType ( )

inlinevirtual

Implements loss_function.

Definition at line 119 of file loss_functions.cc.

{ return "hinge"; }

getUnsafeUpdate()

float hingeloss::getUnsafeUpdate ( float  prediction, float  label, float  update_scale  )

inlinevirtual

Implements loss_function.

Definition at line 137 of file loss_functions.cc.

  {
    if (label * prediction >= 1)
      return 0;
    return label * update_scale;
  }

getUpdate()

float hingeloss::getUpdate ( float  prediction, float  label, float  update_scale, float  pred_per_update  )

inlinevirtual

Implements loss_function.

Definition at line 129 of file loss_functions.cc.

  {
    if (label * prediction >= 1)
      return 0;
    float err = 1 - label * prediction;
    return label * (update_scale * pred_per_update < err ? update_scale : err / pred_per_update);
  }

second_derivative()

float hingeloss::second_derivative ( shared_data *  , float  , float    )

inlinevirtual

Implements loss_function.

Definition at line 154 of file loss_functions.cc.

{ return 0.; }

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The documentation for this class was generated from the following file:

• /mnt/c/w/linux/vowpal_wabbit/vowpalwabbit/loss_functions.cc