14 #ifndef MLPACK_METHODS_ANN_LOSS_FUNCTION_EMPTY_LOSS_HPP    15 #define MLPACK_METHODS_ANN_LOSS_FUNCTION_EMPTY_LOSS_HPP    32     typename InputDataType = arma::mat,
    33     typename OutputDataType = arma::mat
    50   template<
typename PredictionType, 
typename TargetType>
    51   double Forward(
const PredictionType& input, 
const TargetType& target);
    61   template<
typename PredictionType, 
typename TargetType, 
typename LossType>
    62   void Backward(
const PredictionType& prediction,
    63                 const TargetType& target,
    71 #include "empty_loss_impl.hpp" void Backward(const PredictionType &prediction, const TargetType &target, LossType &loss)
Ordinary feed backward pass of a neural network. 
 
Linear algebra utility functions, generally performed on matrices or vectors. 
 
The core includes that mlpack expects; standard C++ includes and Armadillo. 
 
The empty loss does nothing, letting the user calculate the loss outside the model. 
 
double Forward(const PredictionType &input, const TargetType &target)
Computes the Empty loss function. 
 
EmptyLoss()
Create the EmptyLoss object.