From 90d354a2a5a3ba76071337d8794cfc00f7bc5fab Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Sat, 13 Dec 2014 20:01:21 +0000
Subject: [PATCH] fixed dropout ><
---
src/dropout_layer.c | 42 ++++++++++++++++++++++++++++++++++++------
1 files changed, 36 insertions(+), 6 deletions(-)
diff --git a/src/dropout_layer.c b/src/dropout_layer.c
index ad13034..d4616d5 100644
--- a/src/dropout_layer.c
+++ b/src/dropout_layer.c
@@ -10,8 +10,9 @@
layer->probability = probability;
layer->inputs = inputs;
layer->batch = batch;
- #ifdef GPU
layer->rand = calloc(inputs*batch, sizeof(float));
+ layer->scale = 1./(1.-probability);
+ #ifdef GPU
layer->rand_cl = cl_make_array(layer->rand, inputs*batch);
#endif
return layer;
@@ -21,13 +22,21 @@
{
int i;
for(i = 0; i < layer.batch * layer.inputs; ++i){
- if(rand_uniform() < layer.probability) input[i] = 0;
- else input[i] /= (1-layer.probability);
+ float r = rand_uniform();
+ layer.rand[i] = r;
+ if(r < layer.probability) input[i] = 0;
+ else 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;
+ 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;
+ }
}
#ifdef GPU
@@ -36,7 +45,7 @@
static int init = 0;
static cl_kernel kernel;
if(!init){
- kernel = get_kernel("src/dropout_layer.cl", "forward", 0);
+ kernel = get_kernel("src/dropout_layer.cl", "yoloswag420blazeit360noscope", 0);
init = 1;
}
return kernel;
@@ -56,6 +65,27 @@
cl.error = clSetKernelArg(kernel, i++, sizeof(input), (void*) &input);
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);
+ check_error(cl);
+
+ const size_t global_size[] = {size};
+
+ cl.error = clEnqueueNDRangeKernel(queue, kernel, 1, 0, global_size, 0, 0, 0, 0);
+ check_error(cl);
+}
+
+void backward_dropout_layer_gpu(dropout_layer layer, cl_mem delta)
+{
+ int size = layer.inputs*layer.batch;
+
+ cl_kernel kernel = get_dropout_kernel();
+ cl_command_queue queue = cl.queue;
+
+ cl_uint i = 0;
+ cl.error = clSetKernelArg(kernel, i++, sizeof(delta), (void*) &delta);
+ 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);
check_error(cl);
const size_t global_size[] = {size};
--
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