From ed35a6fea4a1604db81c56fc71f7756822fcf212 Mon Sep 17 00:00:00 2001
From: Richard Burton <richard.burton@arm.com>
Date: Mon, 14 Feb 2022 11:55:35 +0000
Subject: MLECO-2874: Move NMS out of the OD use_case

* Add ImageUtils
* Move image related code from UseCaseCommonUtils to ImageUtils
* Move NMS related code to ImageUtils
* Delete test specific ImageUtils and use new ImageUtils

Signed-off-by: Richard Burton <richard.burton@arm.com>
Change-Id: Icbf5dd9c6a941b0126ecdf69a0c9d9969f22729f
---
 source/math/PlatformMath.cc          |  7 ++++++-
 source/math/include/PlatformMath.hpp | 14 ++++++++++----
 2 files changed, 16 insertions(+), 5 deletions(-)

(limited to 'source/math')

diff --git a/source/math/PlatformMath.cc b/source/math/PlatformMath.cc
index cc603f3..b666d29 100644
--- a/source/math/PlatformMath.cc
+++ b/source/math/PlatformMath.cc
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Arm Limited. All rights reserved.
+ * Copyright (c) 2021-2022 Arm Limited. All rights reserved.
  * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -303,6 +303,11 @@ namespace math {
         }
     }
 
+    float MathUtils::SigmoidF32(float x)
+    {
+        return 1.f/(1.f + std::exp(-x));
+    }
+
 } /* namespace math */
 } /* namespace app */
 } /* namespace arm */
diff --git a/source/math/include/PlatformMath.hpp b/source/math/include/PlatformMath.hpp
index 5ac10de..2bf7733 100644
--- a/source/math/include/PlatformMath.hpp
+++ b/source/math/include/PlatformMath.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Arm Limited. All rights reserved.
+ * Copyright (c) 2021-2022 Arm Limited. All rights reserved.
  * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -19,7 +19,6 @@
 
 /* See if ARM DSP functions can be used. */
 #if defined(ARM_MATH_DSP)
-
     #include "arm_math.h"
     #define M_PI    (PI)
 #else
@@ -127,8 +126,8 @@ namespace math {
          * @param[out]  output   Pre-allocated buffer to be populated with
          *                       natural log values of each input element.
          */
-        static void VecLogarithmF32(std::vector <float>& input,
-                                    std::vector <float>& output);
+        static void VecLogarithmF32(std::vector<float>& input,
+                                    std::vector<float>& output);
 
         /**
          * @brief       Computes the dot product of two 1D floating point
@@ -165,6 +164,13 @@ namespace math {
         * @param[in]   vector Vector of floats modified in-place
         */
         static void SoftmaxF32(std::vector<float>& vec);
+
+        /**
+        * @brief       Calculate the Sigmoid function of the given value.
+        * @param[in]   x   Value to apply Sigmoid to.
+        * @return      Sigmoid value of the input.
+        */
+        static float SigmoidF32(float x);
     };
 
 } /* namespace math */
-- 
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