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| #include "activations.h"
|
| #include <math.h>
| #include <stdio.h>
| #include <string.h>
|
| ACTIVATION get_activation(char *s)
| {
| if (strcmp(s, "sigmoid")==0) return SIGMOID;
| if (strcmp(s, "relu")==0) return RELU;
| if (strcmp(s, "linear")==0) return LINEAR;
| if (strcmp(s, "ramp")==0) return RAMP;
| if (strcmp(s, "tanh")==0) return TANH;
| fprintf(stderr, "Couldn't find activation function %s, going with ReLU\n", s);
| return RELU;
| }
|
| double activate(double x, ACTIVATION a){
| switch(a){
| case LINEAR:
| return x;
| case SIGMOID:
| return 1./(1.+exp(-x));
| case RELU:
| return x*(x>0);
| case RAMP:
| return x*(x>0) + .1*x;
| case TANH:
| return (exp(2*x)-1)/(exp(2*x)+1);
| }
| return 0;
| }
| double gradient(double x, ACTIVATION a){
| switch(a){
| case LINEAR:
| return 1;
| case SIGMOID:
| return (1.-x)*x;
| case RELU:
| return (x>0);
| case RAMP:
| return (x>0) + .1;
| case TANH:
| return 1-x*x;
| }
| return 0;
| }
|
|
