From 0d6bb5d44d8e815ebf6ccce1dae2f83178780e7b Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Tue, 03 Dec 2013 00:41:40 +0000
Subject: [PATCH] Working?
---
src/activations.c | 41 ++++++++++++++++++++++++++++++++++++++++-
1 files changed, 40 insertions(+), 1 deletions(-)
diff --git a/src/activations.c b/src/activations.c
index aef21cb..a255f0f 100644
--- a/src/activations.c
+++ b/src/activations.c
@@ -1,6 +1,45 @@
#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, "identity")==0) return IDENTITY;
+ if (strcmp(s, "ramp")==0) return RAMP;
+ fprintf(stderr, "Couldn't find activation function %s, going with ReLU\n", s);
+ return RELU;
+}
+
+double activate(double x, ACTIVATION a){
+ switch(a){
+ case IDENTITY:
+ return x;
+ case SIGMOID:
+ return 1./(1.+exp(-x));
+ case RELU:
+ return x*(x>0);
+ case RAMP:
+ return x*(x>0) + .1*x;
+ }
+ return 0;
+}
+double gradient(double x, ACTIVATION a){
+ switch(a){
+ case IDENTITY:
+ return 1;
+ case SIGMOID:
+ return (1.-x)*x;
+ case RELU:
+ return (x>0);
+ case RAMP:
+ return (x>0) + .1;
+ }
+ return 0;
+}
double identity_activation(double x)
{
@@ -17,7 +56,7 @@
}
double relu_gradient(double x)
{
- return (x>=0);
+ return (x>0);
}
double sigmoid_activation(double x)
--
Gitblit v1.10.0