From 29388f80a58b953850f23bb8a0efea557e232b7d Mon Sep 17 00:00:00 2001
From: fengyuentau <yuantao.feng@opencv.org.cn>
Date: Fri, 23 Jun 2023 17:10:29 +0800
Subject: [PATCH] fix overflow

---
 modules/dnn/src/layers/elementwise_layers.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/modules/dnn/src/layers/elementwise_layers.cpp b/modules/dnn/src/layers/elementwise_layers.cpp
index b84523eb93..e4375abd6d 100644
--- a/modules/dnn/src/layers/elementwise_layers.cpp
+++ b/modules/dnn/src/layers/elementwise_layers.cpp
@@ -680,7 +680,14 @@ struct SigmoidFunctor : public BaseDefaultFunctor<SigmoidFunctor>
 
     inline float calculate(float x) const
     {
-        return 1.f / (1.f + exp(-x));
+        float y;
+        if (x >= 0)
+            y = 1.f / (1.f + exp(-x));
+        else {
+            y = exp(x);
+            y = y / (1 + y);
+        }
+        return y;
     }
 
 #ifdef HAVE_HALIDE