From 08b757a0bf76efe8c76b453063a1bb19315bcaa6 Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Wed, 14 Jan 2015 20:18:57 +0000
Subject: [PATCH] Stable, needs to be way faster
---
src/dropout_layer.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/src/dropout_layer.c b/src/dropout_layer.c
index d4616d5..edcb426 100644
--- a/src/dropout_layer.c
+++ b/src/dropout_layer.c
@@ -10,9 +10,11 @@
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_cl = cl_make_array(layer->output, inputs*batch);
layer->rand_cl = cl_make_array(layer->rand, inputs*batch);
#endif
return layer;
@@ -24,14 +26,15 @@
for(i = 0; i < layer.batch * layer.inputs; ++i){
float r = rand_uniform();
layer.rand[i] = r;
- if(r < layer.probability) input[i] = 0;
- else input[i] *= layer.scale;
+ if(r < layer.probability) layer.output[i] = 0;
+ else layer.output[i] = input[i]*layer.scale;
}
}
void backward_dropout_layer(dropout_layer layer, float *delta)
{
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;
@@ -66,6 +69,7 @@
cl.error = clSetKernelArg(kernel, i++, sizeof(layer.rand_cl), (void*) &layer.rand_cl);
cl.error = clSetKernelArg(kernel, i++, sizeof(layer.probability), (void*) &layer.probability);
cl.error = clSetKernelArg(kernel, i++, sizeof(layer.scale), (void*) &layer.scale);
+ cl.error = clSetKernelArg(kernel, i++, sizeof(layer.output_cl), (void*) &layer.output_cl);
check_error(cl);
const size_t global_size[] = {size};
@@ -76,6 +80,7 @@
void backward_dropout_layer_gpu(dropout_layer layer, cl_mem delta)
{
+ if(!delta) return;
int size = layer.inputs*layer.batch;
cl_kernel kernel = get_dropout_kernel();
@@ -86,6 +91,7 @@
cl.error = clSetKernelArg(kernel, i++, sizeof(layer.rand_cl), (void*) &layer.rand_cl);
cl.error = clSetKernelArg(kernel, i++, sizeof(layer.probability), (void*) &layer.probability);
cl.error = clSetKernelArg(kernel, i++, sizeof(layer.scale), (void*) &layer.scale);
+ cl.error = clSetKernelArg(kernel, i++, sizeof(delta), (void*) &delta);
check_error(cl);
const size_t global_size[] = {size};
--
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