text: #ifndef LOGISTIC_ACTIVATION_FUNCTION_H_INCLUDED
  #define LOGISTIC_ACTIVATION_FUNCTION_H_INCLUDED
  
  #include "activation_function.h"
  
  class LogisticActivationFunction : public ActivationFunction
  {
  public:
      double evaluate(double x) const;
      double evaluate_derivative(double x) const;
  } extern logisticActivationFunction;
  
  #endif // LOGISTIC_ACTIVATION_FUNCTION_H_INCLUDED
  