From 1b5e6d8855064e5d990bd73f1f3a0aa00cbdfb4c Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Sat, 01 Mar 2014 22:41:30 +0000
Subject: [PATCH] Flipping features now a flag
---
src/activations.c | 76 +++++++++++++++++++++++++-------------
1 files changed, 50 insertions(+), 26 deletions(-)
diff --git a/src/activations.c b/src/activations.c
index a128029..c81d6aa 100644
--- a/src/activations.c
+++ b/src/activations.c
@@ -4,40 +4,64 @@
#include <stdio.h>
#include <string.h>
+char *get_activation_string(ACTIVATION a)
+{
+ switch(a){
+ case SIGMOID:
+ return "sigmoid";
+ case RELU:
+ return "relu";
+ case RAMP:
+ return "ramp";
+ case LINEAR:
+ return "linear";
+ case TANH:
+ return "tanh";
+ default:
+ break;
+ }
+ return "relu";
+}
+
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, "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 identity_activation(double x)
-{
- return x;
+float activate(float 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 identity_gradient(double x)
-{
- return 1;
-}
-
-double relu_activation(double x)
-{
- return x*(x>0);
-}
-double relu_gradient(double x)
-{
- return (x>=0);
-}
-
-double sigmoid_activation(double x)
-{
- return 1./(1.+exp(-x));
-}
-
-double sigmoid_gradient(double x)
-{
- return x*(1.-x);
+float gradient(float 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;
}
--
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