GeneralActivationFunction.h

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#ifndef CGENERALACTIVATIONFUNCTION_H
#define CGENERALACTIVATIONFUNCTION_H

/** \addtogroup neuralnet Neural Network filtering */
/* @{ */

//! The base class for all activation functions in neural network

/*! The activation function in a neural network node determines the type of
 * non-linearity between input and output. We have to implement the activation function 
 * and its derivative.
 */
class GeneralActivationFunction
  {
public:
  //! The function that maps between the weighted sum that's the input of the neuron and the output
  virtual double CalcOutput(const double input) = 0;
  //! The derivative of the function defined in CalcOutput
  virtual double CalcDeriv(const double input) = 0;
  GeneralActivationFunction();
  virtual ~GeneralActivationFunction();
  };
/* @} */
#endif // CGENERALACTIVATIONFUNCTION_H

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