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.
111 lines
3.8 KiB
C++
111 lines
3.8 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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// 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_FieldEntropy_h
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#define vtk_m_worklet_FieldEntropy_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/FieldHistogram.h>
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#include <vtkm/worklet/WorkletMapField.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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//simple functor that returns basic statistics
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class FieldEntropy
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{
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public:
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// For each bin, calculate its information content (log2)
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class SetBinInformationContent : public vtkm::worklet::WorkletMapField
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{
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public:
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using ControlSignature = void(FieldIn<> freq, FieldOut<> informationContent);
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using ExecutionSignature = void(_1, _2);
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vtkm::Float64 FreqSum;
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VTKM_CONT
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SetBinInformationContent(vtkm::Float64 _freqSum)
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: FreqSum(_freqSum)
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{
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}
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template <typename FreqType>
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VTKM_EXEC void operator()(const FreqType& freq, vtkm::Float64& informationContent) const
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{
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vtkm::Float64 p = ((vtkm::Float64)freq) / FreqSum;
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if (p > 0)
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informationContent = -1 * p * vtkm::Log2(p);
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else
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informationContent = 0;
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}
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};
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// Execute the entropy computation filter given data(a field) and number of bins
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// Returns:
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// Entropy (log2) of the field of the data
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template <typename FieldType, typename Storage, typename DeviceAdapter>
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vtkm::Float64 Run(vtkm::cont::ArrayHandle<FieldType, Storage> fieldArray,
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vtkm::Id numberOfBins,
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DeviceAdapter device)
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{
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using DeviceAlgorithms = typename vtkm::cont::DeviceAdapterAlgorithm<DeviceAdapter>;
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///// calculate histogram using FieldHistogram worklet /////
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vtkm::Range range;
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FieldType delta;
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vtkm::cont::ArrayHandle<vtkm::Id> binArray;
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vtkm::worklet::FieldHistogram histogram;
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histogram.Run(fieldArray, numberOfBins, range, delta, binArray, 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(binArray, 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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SetBinInformationContent binWorklet(static_cast<vtkm::Float64>(freqSum));
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vtkm::worklet::DispatcherMapField<SetBinInformationContent> setBinInformationContentDispatcher(
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binWorklet);
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setBinInformationContentDispatcher.SetDevice(DeviceAdapter());
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setBinInformationContentDispatcher.Invoke(binArray, 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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};
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}
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} // namespace vtkm::worklet
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#endif // vtk_m_worklet_FieldEntropy_h
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