From d31b93b513df40f1549127836168a0fb17ca3cec Mon Sep 17 00:00:00 2001
From: rogday <s.e.a.98@yandex.ru>
Date: Fri, 10 Sep 2021 14:07:16 +0300
Subject: [PATCH] Merge pull request #20674 from rogday:prelu_slope

Fix PReLU negative slope access pattern

* fix prelu negative slope access pattern

* change begin() to ptr()
---
 modules/dnn/src/layers/elementwise_layers.cpp | 2 +-
 modules/dnn/test/test_onnx_importer.cpp       | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/modules/dnn/src/layers/elementwise_layers.cpp b/modules/dnn/src/layers/elementwise_layers.cpp
index e6cf714bff..6e7fa43a70 100644
--- a/modules/dnn/src/layers/elementwise_layers.cpp
+++ b/modules/dnn/src/layers/elementwise_layers.cpp
@@ -1542,7 +1542,7 @@ Ptr<Layer> ChannelsPReLULayer::create(const LayerParams& params)
     if (params.blobs[0].total() == 1)
     {
         LayerParams reluParams = params;
-        reluParams.set("negative_slope", params.blobs[0].at<float>(0));
+        reluParams.set("negative_slope", *params.blobs[0].ptr<float>());
         return ReLULayer::create(reluParams);
     }
     Ptr<ChannelsPReLULayer> l(new ElementWiseLayer<ChannelsPReLUFunctor>(ChannelsPReLUFunctor(params.blobs[0])));
diff --git a/modules/dnn/test/test_onnx_importer.cpp b/modules/dnn/test/test_onnx_importer.cpp
index 7b94e02d0a..f55510ec7b 100644
--- a/modules/dnn/test/test_onnx_importer.cpp
+++ b/modules/dnn/test/test_onnx_importer.cpp
@@ -250,6 +250,11 @@ TEST_P(Test_ONNX_layers, ReLU)
     testONNXModels("ReLU");
 }
 
+TEST_P(Test_ONNX_layers, PReLU)
+{
+    testONNXModels("PReLU_slope");
+}
+
 TEST_P(Test_ONNX_layers, Clip)
 {
     testONNXModels("clip", npy);