From 6056b835eb76b8a078aab18db3e7aba87314f4ce Mon Sep 17 00:00:00 2001
From: AlexeyAB <alexeyab84@gmail.com>
Date: Wed, 18 Apr 2018 22:34:26 +0000
Subject: [PATCH] Fixed Focal-loss
---
src/yolo_layer.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/src/yolo_layer.c b/src/yolo_layer.c
index ad62426..b2443ba 100644
--- a/src/yolo_layer.c
+++ b/src/yolo_layer.c
@@ -121,12 +121,13 @@
if (focal_loss) {
// Focal Loss
float alpha = 0.5; // 0.25 or 0.5
- //float gamma = 2; // hardcoded in many places of the grad-formula
+ //float gamma = 2; // hardcoded in many places of the grad-formula
int ti = index + stride*class_id;
float pt = output[ti] + 0.000000000000001F;
- //float grad = -(1 - pt) * (2 * pt*logf(pt) + pt - 1); // http://blog.csdn.net/linmingan/article/details/77885832
- float grad = (1 - pt) * (2 * pt*logf(pt) + pt - 1); // https://github.com/unsky/focal-loss
+ // http://fooplot.com/#W3sidHlwZSI6MCwiZXEiOiItKDEteCkqKDIqeCpsb2coeCkreC0xKSIsImNvbG9yIjoiIzAwMDAwMCJ9LHsidHlwZSI6MTAwMH1d
+ float grad = -(1 - pt) * (2 * pt*logf(pt) + pt - 1); // http://blog.csdn.net/linmingan/article/details/77885832
+ //float grad = (1 - pt) * (2 * pt*logf(pt) + pt - 1); // https://github.com/unsky/focal-loss
for (n = 0; n < classes; ++n) {
delta[index + stride*n] = (((n == class_id) ? 1 : 0) - output[index + stride*n]);
--
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