#include "activations.h"
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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char *get_activation_string(ACTIVATION a)
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{
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switch(a){
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case LOGISTIC:
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return "logistic";
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case RELU:
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return "relu";
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case RELIE:
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return "relie";
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case RAMP:
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return "ramp";
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case LINEAR:
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return "linear";
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case TANH:
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return "tanh";
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case PLSE:
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return "plse";
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case LEAKY:
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return "leaky";
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default:
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break;
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}
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return "relu";
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}
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ACTIVATION get_activation(char *s)
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{
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if (strcmp(s, "logistic")==0) return LOGISTIC;
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if (strcmp(s, "relu")==0) return RELU;
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if (strcmp(s, "relie")==0) return RELIE;
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if (strcmp(s, "plse")==0) return PLSE;
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if (strcmp(s, "linear")==0) return LINEAR;
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if (strcmp(s, "ramp")==0) return RAMP;
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if (strcmp(s, "leaky")==0) return LEAKY;
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if (strcmp(s, "tanh")==0) return TANH;
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fprintf(stderr, "Couldn't find activation function %s, going with ReLU\n", s);
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return RELU;
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}
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float activate(float x, ACTIVATION a)
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{
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switch(a){
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case LINEAR:
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return linear_activate(x);
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case LOGISTIC:
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return logistic_activate(x);
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case RELU:
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return relu_activate(x);
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case RELIE:
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return relie_activate(x);
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case RAMP:
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return ramp_activate(x);
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case LEAKY:
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return leaky_activate(x);
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case TANH:
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return tanh_activate(x);
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case PLSE:
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return plse_activate(x);
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}
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return 0;
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}
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void activate_array(float *x, const int n, const ACTIVATION a)
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{
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int i;
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for(i = 0; i < n; ++i){
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x[i] = activate(x[i], a);
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}
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}
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float gradient(float x, ACTIVATION a)
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{
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switch(a){
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case LINEAR:
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return linear_gradient(x);
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case LOGISTIC:
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return logistic_gradient(x);
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case RELU:
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return relu_gradient(x);
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case RELIE:
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return relie_gradient(x);
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case RAMP:
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return ramp_gradient(x);
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case LEAKY:
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return leaky_gradient(x);
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case TANH:
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return tanh_gradient(x);
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case PLSE:
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return plse_gradient(x);
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}
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return 0;
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}
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void gradient_array(const float *x, const int n, const ACTIVATION a, float *delta)
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{
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int i;
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for(i = 0; i < n; ++i){
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delta[i] *= gradient(x[i], a);
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}
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}
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