#ifndef ACTIVATIONS_H
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#define ACTIVATIONS_H
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#include "cuda.h"
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#include "math.h"
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typedef enum{
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LOGISTIC, RELU, RELIE, LINEAR, RAMP, TANH, PLSE, LEAKY
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}ACTIVATION;
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ACTIVATION get_activation(char *s);
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char *get_activation_string(ACTIVATION a);
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float activate(float x, ACTIVATION a);
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float gradient(float x, ACTIVATION a);
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void gradient_array(const float *x, const int n, const ACTIVATION a, float *delta);
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void activate_array(float *x, const int n, const ACTIVATION a);
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#ifdef GPU
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void activate_array_ongpu(float *x, int n, ACTIVATION a);
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void gradient_array_ongpu(float *x, int n, ACTIVATION a, float *delta);
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#endif
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static inline float linear_activate(float x){return x;}
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static inline float logistic_activate(float x){return 1./(1. + exp(-x));}
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static inline float relu_activate(float x){return x*(x>0);}
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static inline float relie_activate(float x){return x*(x>0);}
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static inline float ramp_activate(float x){return x*(x>0)+.1*x;}
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static inline float leaky_activate(float x){return (x>0) ? x : .1*x;}
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static inline float tanh_activate(float x){return (exp(2*x)-1)/(exp(2*x)+1);}
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static inline float plse_activate(float x)
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{
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if(x < -4) return .01 * (x + 4);
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if(x > 4) return .01 * (x - 4) + 1;
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return .125*x + .5;
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}
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static inline float linear_gradient(float x){return 1;}
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static inline float logistic_gradient(float x){return (1-x)*x;}
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static inline float relu_gradient(float x){return (x>0);}
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static inline float relie_gradient(float x){return (x>0) ? 1 : .01;}
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static inline float ramp_gradient(float x){return (x>0)+.1;}
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static inline float leaky_gradient(float x){return (x>0) ? 1 : .1;}
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static inline float tanh_gradient(float x){return 1-x*x;}
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static inline float plse_gradient(float x){return (x < 0 || x > 1) ? .01 : .125;}
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#endif
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