typedef enum{
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SIGMOID, RELU, LINEAR, RAMP, TANH
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}ACTIVATION;
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float linear_activate(float x){return x;}
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float sigmoid_activate(float x){return 1./(1. + exp(-x));}
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float relu_activate(float x){return x*(x>0);}
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float ramp_activate(float x){return x*(x>0)+.1*x;}
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float tanh_activate(float x){return (exp(2*x)-1)/(exp(2*x)+1);}
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float activate(float x, ACTIVATION a, float dropout)
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{
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//if((float)rand()/RAND_MAX < dropout) return 0;
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switch(a){
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case LINEAR:
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return linear_activate(x)/(1-dropout);
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case SIGMOID:
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return sigmoid_activate(x)/(1-dropout);
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case RELU:
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return relu_activate(x)/(1-dropout);
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case RAMP:
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return ramp_activate(x)/(1-dropout);
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case TANH:
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return tanh_activate(x)/(1-dropout);
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}
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return 0;
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}
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__kernel void activate_array(__global float *x,
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const int n, const ACTIVATION a, const float dropout)
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{
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int i = get_global_id(0);
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x[i] = activate(x[i], a, dropout);
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}
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