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non_max_suppression_helpers.hpp
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1 /*
2  * Copyright (c) 2025 Advanced Micro Devices, Inc. All rights reserved.
3  * Permission is hereby granted, free of charge, to any person obtaining a copy
4  * of this software and associated documentation files (the "Software"), to deal
5  * in the Software without restriction, including without limitation the rights
6  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7  * copies of the Software, and to permit persons to whom the Software is
8  * furnished to do so, subject to the following conditions:
9  *
10  * The above copyright notice and this permission notice shall be included in
11  * all copies or substantial portions of the Software.
12  *
13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19  * THE SOFTWARE.
20  */
21 
22 #pragma once
23 
24 #include <hip/hip_runtime.h>
25 
26 namespace Kernels {
27 inline __device__ __host__ float ComputeArea(const short4 &box) { return box.z * box.w; }
28 
29 inline __device__ __host__ float ComputeIoU(const short4 &boxA, const short4 &boxB) {
30  int aInterLeft = std::max(boxA.x, boxB.x);
31  int bInterTop = std::max(boxA.y, boxB.y);
32  int aInterRight = std::min(boxA.x + boxA.z, boxB.x + boxB.z);
33  int bInterBottom = std::min(boxA.y + boxA.w, boxB.y + boxB.w);
34  int widthInter = aInterRight - aInterLeft;
35  int heightInter = bInterBottom - bInterTop;
36  float interArea = widthInter * heightInter;
37  float iou = 0.0f;
38 
39  if (widthInter > 0.0f && heightInter > 0.0f) {
40  float unionArea = ComputeArea(boxA) + ComputeArea(boxB) - interArea;
41  if (unionArea > 0.0f) {
42  iou = interArea / unionArea;
43  }
44  }
45 
46  return iou;
47 }
48 }; // namespace Kernels
Kernels
Definition: non_max_suppression_helpers.hpp:26
Kernels::ComputeArea
__device__ __host__ float ComputeArea(const short4 &box)
Definition: non_max_suppression_helpers.hpp:27
Kernels::ComputeIoU
__device__ __host__ float ComputeIoU(const short4 &boxA, const short4 &boxB)
Definition: non_max_suppression_helpers.hpp:29