mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-20 11:05:44 +00:00
d879188de0
Rather than force all dispatchers to be templated on a device adapter, instead use a TryExecute internally within the invoke to select a device adapter. Because this removes the need to declare a device when invoking a worklet, this commit also removes the need to declare a device in several other areas of the code.
104 lines
3.6 KiB
C++
104 lines
3.6 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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// 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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// Copyright 2014 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-NA0003525 with NTESS,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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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/ArrayHandle.h>
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#include <vtkm/cont/ArrayHandleCounting.h>
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#include <vtkm/cont/DeviceAdapter.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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template <typename DeviceAdapter>
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void SetNumOfDataPoints(vtkm::Id _numDataPoints, DeviceAdapter device)
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{
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NumDataPoints = _numDataPoints;
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NdHistogram.SetNumOfDataPoints(_numDataPoints, device);
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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, typename DeviceAdapter>
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void AddField(const HandleType& fieldArray, vtkm::Id numberOfBins, DeviceAdapter device)
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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, device);
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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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template <typename DeviceAdapter>
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vtkm::Float64 Run(DeviceAdapter device)
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{
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using DeviceAlgorithms = typename vtkm::cont::DeviceAdapterAlgorithm<DeviceAdapter>;
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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, device);
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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 = DeviceAlgorithms::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.SetDevice(DeviceAdapter());
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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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DeviceAlgorithms::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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