// Copyright (C) 2003--2004 Ronan Collobert (collober@idiap.ch)
//                
// This file is part of Torch 3.1.
//
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. The name of the author may not be used to endorse or promote products
//    derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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#ifndef SATURATION_MEASURER_INC
#define SATURATION_MEASURER_INC

#include "Measurer.h"
#include "GradientMachine.h"

namespace Torch {

/** Measure the saturation of a #GradientMachine#.

    Save in #file# (on two columns)
    \begin{itemize}
      \item the absolute mean of the outputs of the machine.
      \item the absolute mean of the derivative of the parameters of the machine.
    \end{itemize}

   @author Ronan Collobert (collober@idiap.ch)
*/
class SaturationMeasurer : public Measurer
{
  public:
    real derivatives_sum;
    real outputs_sum;
    real n_sum_out;
    real n_sum_der;

    GradientMachine *machine;

    //-----

    ///
    SaturationMeasurer(GradientMachine *machine_, DataSet *data_, XFile *file_);

    //-----

    virtual void reset();
    void reset_();
    virtual void measureExample();
    virtual void measureIteration();

    virtual ~SaturationMeasurer();
};

}

#endif
