From f047cfff99e00e28c02eb59b6d32386c122f9af6 Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Sun, 08 Mar 2015 18:31:12 +0000
Subject: [PATCH] renamed sigmoid to logistic
---
src/dropout_layer.c | 44 ++++++++++++++++++++++++++++++++++++++------
1 files changed, 38 insertions(+), 6 deletions(-)
diff --git a/src/dropout_layer.c b/src/dropout_layer.c
index fcad7b9..32a3408 100644
--- a/src/dropout_layer.c
+++ b/src/dropout_layer.c
@@ -1,6 +1,8 @@
#include "dropout_layer.h"
-#include "stdlib.h"
-#include "stdio.h"
+#include "utils.h"
+#include "cuda.h"
+#include <stdlib.h>
+#include <stdio.h>
dropout_layer *make_dropout_layer(int batch, int inputs, float probability)
{
@@ -9,18 +11,48 @@
layer->probability = probability;
layer->inputs = inputs;
layer->batch = batch;
+ layer->output = calloc(inputs*batch, sizeof(float));
+ layer->rand = calloc(inputs*batch, sizeof(float));
+ layer->scale = 1./(1.-probability);
+ #ifdef GPU
+ layer->output_gpu = cuda_make_array(layer->output, inputs*batch);
+ layer->rand_gpu = cuda_make_array(layer->rand, inputs*batch);
+ #endif
return layer;
}
+void resize_dropout_layer(dropout_layer *layer, int inputs)
+{
+ layer->output = realloc(layer->output, layer->inputs*layer->batch*sizeof(float));
+ layer->rand = realloc(layer->rand, layer->inputs*layer->batch*sizeof(float));
+ #ifdef GPU
+ cuda_free(layer->output_gpu);
+ cuda_free(layer->rand_gpu);
+
+ layer->output_gpu = cuda_make_array(layer->output, inputs*layer->batch);
+ layer->rand_gpu = cuda_make_array(layer->rand, inputs*layer->batch);
+ #endif
+}
+
void forward_dropout_layer(dropout_layer layer, float *input)
{
int i;
for(i = 0; i < layer.batch * layer.inputs; ++i){
- if((float)rand()/RAND_MAX < layer.probability) input[i] = 0;
- else input[i] /= (1-layer.probability);
+ float r = rand_uniform();
+ layer.rand[i] = r;
+ if(r < layer.probability) layer.output[i] = 0;
+ else layer.output[i] = input[i]*layer.scale;
}
}
-void backward_dropout_layer(dropout_layer layer, float *input, float *delta)
+
+void backward_dropout_layer(dropout_layer layer, float *delta)
{
- // Don't do shit LULZ
+ int i;
+ if(!delta) return;
+ for(i = 0; i < layer.batch * layer.inputs; ++i){
+ float r = layer.rand[i];
+ if(r < layer.probability) delta[i] = 0;
+ else delta[i] *= layer.scale;
+ }
}
+
--
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