mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 21:33:55 +00:00
89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#ifndef vtk_m_worklet_NDimsEntropy_h
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#define vtk_m_worklet_NDimsEntropy_h
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#include <vtkm/Math.h>
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#include <vtkm/cont/Algorithm.h>
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/ArrayHandleCounting.h>
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#include <vtkm/worklet/DispatcherMapField.h>
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#include <vtkm/worklet/NDimsHistogram.h>
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#include <vtkm/worklet/WorkletMapField.h>
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#include <vtkm/worklet/histogram/ComputeNDEntropy.h>
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#include <vtkm/cont/Field.h>
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namespace vtkm
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{
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namespace worklet
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{
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class NDimsEntropy
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{
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public:
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void SetNumOfDataPoints(vtkm::Id _numDataPoints)
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{
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NumDataPoints = _numDataPoints;
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NdHistogram.SetNumOfDataPoints(_numDataPoints);
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}
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// Add a field and the bin for this field
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// Return: rangeOfRange is min max value of this array
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// binDelta is delta of a bin
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template <typename HandleType>
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void AddField(const HandleType& fieldArray, vtkm::Id numberOfBins)
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{
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vtkm::Range range;
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vtkm::Float64 delta;
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NdHistogram.AddField(fieldArray, numberOfBins, range, delta);
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}
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// Execute the entropy computation filter given
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// fields and number of bins of each fields
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// Returns:
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// Entropy (log2) of the field of the data
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vtkm::Float64 Run()
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{
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std::vector<vtkm::cont::ArrayHandle<vtkm::Id>> binIds;
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vtkm::cont::ArrayHandle<vtkm::Id> freqs;
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NdHistogram.Run(binIds, freqs);
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///// calculate sum of frequency of the histogram /////
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vtkm::Id initFreqSumValue = 0;
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vtkm::Id freqSum = vtkm::cont::Algorithm::Reduce(freqs, initFreqSumValue, vtkm::Sum());
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///// calculate information content of each bin using self-define worklet /////
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vtkm::cont::ArrayHandle<vtkm::Float64> informationContent;
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vtkm::worklet::histogram::SetBinInformationContent binWorklet(
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static_cast<vtkm::Float64>(freqSum));
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vtkm::worklet::DispatcherMapField<vtkm::worklet::histogram::SetBinInformationContent>
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setBinInformationContentDispatcher(binWorklet);
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setBinInformationContentDispatcher.Invoke(freqs, informationContent);
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///// calculate entropy by summing up information conetent of all bins /////
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vtkm::Float64 initEntropyValue = 0;
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vtkm::Float64 entropy =
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vtkm::cont::Algorithm::Reduce(informationContent, initEntropyValue, vtkm::Sum());
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return entropy;
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}
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private:
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vtkm::worklet::NDimsHistogram NdHistogram;
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vtkm::Id NumDataPoints;
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};
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}
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} // namespace vtkm::worklet
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#endif // vtk_m_worklet_NDimsEntropy_h
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