From d97331b88ff3d50035b1e22c9d0eb671b61227e3 Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Wed, 15 Apr 2015 07:32:32 +0000
Subject: [PATCH] level adjustment for images
---
src/activations.h | 35 ++++++++++++++++++++++++++++++++---
1 files changed, 32 insertions(+), 3 deletions(-)
diff --git a/src/activations.h b/src/activations.h
index 15d96d3..07c5b5e 100644
--- a/src/activations.h
+++ b/src/activations.h
@@ -1,14 +1,43 @@
+#include "cuda.h"
#ifndef ACTIVATIONS_H
#define ACTIVATIONS_H
typedef enum{
- SIGMOID, RELU, IDENTITY, RAMP
+ LOGISTIC, RELU, RELIE, LINEAR, RAMP, TANH, PLSE
}ACTIVATION;
ACTIVATION get_activation(char *s);
-double activate(double x, ACTIVATION a);
-double gradient(double x, ACTIVATION a);
+char *get_activation_string(ACTIVATION a);
+float activate(float x, ACTIVATION a);
+float gradient(float x, ACTIVATION a);
+void gradient_array(const float *x, const int n, const ACTIVATION a, float *delta);
+void activate_array(float *x, const int n, const ACTIVATION a);
+#ifdef GPU
+void activate_array_ongpu(float *x, int n, ACTIVATION a);
+void gradient_array_ongpu(float *x, int n, ACTIVATION a, float *delta);
+#endif
+
+static inline float linear_activate(float x){return x;}
+static inline float logistic_activate(float x){return 1./(1. + exp(-x));}
+static inline float relu_activate(float x){return x*(x>0);}
+static inline float relie_activate(float x){return x*(x>0);}
+static inline float ramp_activate(float x){return x*(x>0)+.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);
+ if(x > 4) return .01 * (x - 4) + 1;
+ return .125*x + .5;
+}
+
+static inline float linear_gradient(float x){return 1;}
+static inline float logistic_gradient(float x){return (1-x)*x;}
+static inline float relu_gradient(float x){return (x>0);}
+static inline float relie_gradient(float x){return (x>0) ? 1 : .01;}
+static inline float ramp_gradient(float x){return (x>0)+.1;}
+static inline float tanh_gradient(float x){return 1-x*x;}
+static inline float plse_gradient(float x){return (x < 0 || x > 1) ? .01 : .125;}
#endif
--
Gitblit v1.10.0