From a6c51e3b758aee7fd3a6f1d37daa8dcad4891e52 Mon Sep 17 00:00:00 2001
From: AlexeyAB <alexeyab84@gmail.com>
Date: Thu, 08 Mar 2018 22:42:58 +0000
Subject: [PATCH] Fixes for small objects. And fixes of densenet201_yolo.cfg, resnet50_yolo.cfg, resnet152_yolo.cfg
---
src/region_layer.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/src/region_layer.c b/src/region_layer.c
index a83831c..9ca71c6 100644
--- a/src/region_layer.c
+++ b/src/region_layer.c
@@ -131,11 +131,11 @@
// Focal loss
if (focal_loss) {
// Focal Loss for Dense Object Detection: http://blog.csdn.net/linmingan/article/details/77885832
- //printf("Used Focal-loss \n");
- float alpha = 0.5; // 0.25
- float gamma = 2.0;
+ float alpha = 0.5; // 0.25 or 0.5
+ //float gamma = 2; // hardcoded in many places of the grad-formula
+
int ti = index + class_id;
- float grad = -gamma * (1 - output[ti])*logf(fmaxf(output[ti], 0.0000001))*output[ti] + (1 - output[ti])*(1 - output[ti]);
+ float grad = -2 * (1 - output[ti])*logf(fmaxf(output[ti], 0.0000001))*output[ti] + (1 - output[ti])*(1 - output[ti]);
for (n = 0; n < classes; ++n) {
delta[index + n] = scale * (((n == class_id) ? 1 : 0) - output[index + n]);
--
Gitblit v1.10.0