ArmNN
 24.08
InstanceNorm.cpp
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1 //
2 // Copyright © 2019 Arm Ltd. All rights reserved.
3 // SPDX-License-Identifier: MIT
4 //
5 
6 #include "InstanceNorm.hpp"
7 #include "RefWorkloadUtils.hpp"
8 
9 #include <armnn/Tensor.hpp>
10 
12 
13 #include <cmath>
14 
15 namespace armnn
16 {
17 
19  const TensorInfo& inputInfo,
20  Decoder<float>& inputDecoder,
21  Encoder<float>& outputEncoder)
22 {
23  const TensorShape inputShape = inputInfo.GetShape();
24 
26 
27  unsigned int inputBatches = inputShape[0];
28  unsigned int inputHeight = inputShape[dataLayout.GetHeightIndex()];
29  unsigned int inputWidth = inputShape[dataLayout.GetWidthIndex()];
30  unsigned int inputChannels = inputShape[dataLayout.GetChannelsIndex()];
31 
32  float beta = data.m_Parameters.m_Beta;
33  float eps = data.m_Parameters.m_Eps;
34  float gamma = data.m_Parameters.m_Gamma;
35 
36  for (unsigned int n = 0; n < inputBatches; ++n)
37  {
38  for (unsigned int c = 0; c < inputChannels; ++c)
39  {
40  float mean = 0, var = 0;
41 
42  //Calculate Mean
43  for (unsigned int h = 0; h < inputHeight; h++)
44  {
45  for (unsigned int w = 0; w < inputWidth; w++)
46  {
47  unsigned int index = dataLayout.GetIndex(inputShape, n, c, h, w);
48 
49  inputDecoder[index];
50  float value = inputDecoder.Get();
51  mean += value;
52  }
53  }
54  mean /= static_cast<float>(inputHeight * inputWidth);
55 
56  //Calculate Variance
57  for (unsigned int h = 0; h < inputHeight; h++)
58  {
59  for (unsigned int w = 0; w < inputWidth; w++)
60  {
61  unsigned int index = dataLayout.GetIndex(inputShape, n, c, h, w);
62 
63  inputDecoder[index];
64  float value = inputDecoder.Get();
65  var += (value - mean) * (value - mean);
66  }
67  }
68  var /= static_cast<float>(inputHeight * inputWidth);
69 
70  // Apply Instance Normalisation
71  for (unsigned int h = 0; h < inputHeight; ++h)
72  {
73  for (unsigned int w = 0; w < inputWidth; ++w)
74  {
75  unsigned int index = dataLayout.GetIndex(inputShape, n, c, h, w);
76  inputDecoder[index];
77  outputEncoder[index];
78  outputEncoder.Set((inputDecoder.Get() - mean) * gamma / std::sqrt ( var + eps) + beta);
79  }
80 
81  }
82  }
83  }
84 }
85 
86 } // namespace armnn
armnn::InstanceNormalizationDescriptor::m_Beta
float m_Beta
Beta, the offset scalar value applied for the normalized tensor. Defaults to 1.0.
Definition: Descriptors.hpp:867
armnn::Decoder< float >
armnn::Encoder::Set
virtual void Set(IType right)=0
armnn::TensorInfo
Definition: Tensor.hpp:152
armnnUtils::DataLayoutIndexed
Provides access to the appropriate indexes for Channels, Height and Width based on DataLayout.
Definition: DataLayoutIndexed.hpp:17
armnn::InstanceNorm
void InstanceNorm(const InstanceNormalizationQueueDescriptor &data, const TensorInfo &inputInfo, Decoder< float > &inputDecoder, Encoder< float > &outputEncoder)
Definition: InstanceNorm.cpp:18
armnnUtils::DataLayoutIndexed::GetHeightIndex
unsigned int GetHeightIndex() const
Definition: DataLayoutIndexed.hpp:24
armnn::TensorShape
Definition: Tensor.hpp:20
armnn::Encoder< float >
InstanceNorm.hpp
armnn::QueueDescriptorWithParameters::m_Parameters
LayerDescriptor m_Parameters
Definition: WorkloadData.hpp:66
armnn::InstanceNormalizationQueueDescriptor
Definition: WorkloadData.hpp:353
armnn::InstanceNormalizationDescriptor::m_Gamma
float m_Gamma
Gamma, the scale scalar value applied for the normalized tensor. Defaults to 1.0.
Definition: Descriptors.hpp:865
armnnUtils::DataLayoutIndexed::GetWidthIndex
unsigned int GetWidthIndex() const
Definition: DataLayoutIndexed.hpp:25
armnn::Decoder::Get
virtual IType Get() const =0
armnn::InstanceNormalizationDescriptor::m_DataLayout
DataLayout m_DataLayout
The data layout to be used (NCHW, NHWC).
Definition: Descriptors.hpp:871
RefWorkloadUtils.hpp
Tensor.hpp
armnn::TensorInfo::GetShape
const TensorShape & GetShape() const
Definition: Tensor.hpp:193
armnn
Copyright (c) 2021 ARM Limited and Contributors.
Definition: 01_00_quick_start.dox:6
armnnUtils::DataLayoutIndexed::GetChannelsIndex
unsigned int GetChannelsIndex() const
Definition: DataLayoutIndexed.hpp:23
armnnUtils::DataLayoutIndexed::GetIndex
unsigned int GetIndex(const armnn::TensorShape &shape, unsigned int batchIndex, unsigned int channelIndex, unsigned int heightIndex, unsigned int widthIndex) const
Definition: DataLayoutIndexed.hpp:28
DataLayoutIndexed.hpp
armnn::InstanceNormalizationDescriptor::m_Eps
float m_Eps
Epsilon, small scalar value added to variance to avoid dividing by zero. Defaults to 1e-12f.
Definition: Descriptors.hpp:869