Function tanh_activate

yolo_detector/darknet_opt/src/activations.h:39–39

static inline float ramp_activate(float x){return x*(x>0)+.1*x;}
static inline float leaky_activate(float x){return (x>0) ? x : .1*x;}
static inline float tanh_activate(float x){return (exp(2*x)-1)/(exp(2*x)+1);}
static inline float plse_activate(float x)
{
    if(x < -4) return .01 * (x + 4);