IVGCVSW-3694 Add ArgMinMax implementation for Ref
[platform/upstream/armnn.git] / src / backends / reference / workloads / ArgMinMax.cpp
1 //
2 // Copyright © 2019 Arm Ltd. All rights reserved.
3 // SPDX-License-Identifier: MIT
4 //
5
6 #include "ArgMinMax.hpp"
7
8 #include <TensorUtils.hpp>
9
10 #include <boost/numeric/conversion/cast.hpp>
11
12 namespace armnn
13 {
14
15 void ArgMinMax(Decoder<float>& in, int32_t* out, const TensorInfo& inputTensorInfo,
16                const TensorInfo& outputTensorInfo, ArgMinMaxFunction function, int axis)
17 {
18     unsigned int uAxis = armnnUtils::GetUnsignedAxis(inputTensorInfo.GetNumDimensions(), axis);
19
20     const unsigned int outerElements = armnnUtils::GetNumElementsBetween(inputTensorInfo.GetShape(), 0, uAxis);
21     const unsigned int axisSize = inputTensorInfo.GetShape()[uAxis];
22     const unsigned int innerElements = armnnUtils::GetNumElementsBetween(inputTensorInfo.GetShape(),
23                                                                          uAxis + 1,
24                                                                          inputTensorInfo.GetNumDimensions());
25
26     for (unsigned int outer = 0; outer < outerElements; ++outer) {
27         for (unsigned int inner = 0; inner < innerElements; ++inner) {
28             in[outer * axisSize * innerElements + inner];
29             auto tmpValue = in.Get();
30             unsigned int tmpIndex = 0;
31             for (unsigned int i = 1; i < axisSize; ++i) {
32                 in[(outer * axisSize * innerElements) + (i * innerElements) + inner];
33                 const auto& value = in.Get();
34                 if ((function == armnn::ArgMinMaxFunction::Min && value < tmpValue) ||
35                     (function == armnn::ArgMinMaxFunction::Max &&  value > tmpValue)) {
36                     tmpValue = value;
37                     tmpIndex = i;
38                 }
39             }
40             out[outer * innerElements + inner] = boost::numeric_cast<int32_t>(tmpIndex);
41         }
42     }
43 }
44
45 } //namespace armnn