CreatePSDBleedMask.cpp

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#include "MantidAlgorithms/CreatePSDBleedMask.h"
#include "MantidAPI/Run.h"
#include "MantidAPI/SpectrumInfo.h"
#include "MantidAPI/WorkspaceProperty.h"
#include "MantidGeometry/Instrument/ComponentInfo.h"
#include "MantidKernel/BoundedValidator.h"
#include "MantidKernel/MultiThreaded.h"
#include "MantidKernel/NullValidator.h"
 
#include <cfloat>
#include <iterator>
#include <list>
#include <map>
 
namespace Mantid::Algorithms {
 
// Register the class
DECLARE_ALGORITHM(CreatePSDBleedMask)
 
const std::string CreatePSDBleedMask::category() const { return "Diagnostics"; }
 
using API::MatrixWorkspace_const_sptr;
using API::MatrixWorkspace_sptr;
using DataObjects::MaskWorkspace_sptr;
 
CreatePSDBleedMask::CreatePSDBleedMask() = default;
 
void CreatePSDBleedMask::init() {
  using API::WorkspaceProperty;
  using Kernel::BoundedValidator;
  using Kernel::Direction;
 
  declareProperty(std::make_unique<WorkspaceProperty<>>("InputWorkspace", "", Direction::Input),
                  "The name of the input workspace.");
  declareProperty(std::make_unique<WorkspaceProperty<>>("OutputWorkspace", "", Direction::Output),
                  "The name of the output MaskWorkspace which will contain the result "
                  "masks.");
  auto mustBePosDbl = std::make_shared<BoundedValidator<double>>();
  mustBePosDbl->setLower(0.0);
  declareProperty("MaxTubeFramerate", -1.0, mustBePosDbl, "The maximum rate allowed for a tube in counts/us/frame.");
  auto mustBePosInt = std::make_shared<BoundedValidator<int>>();
  mustBePosInt->setLower(0);
  declareProperty("NIgnoredCentralPixels", 80, mustBePosInt, "The number of pixels about the centre to ignore.");
  declareProperty("NumberOfFailures", 0, std::make_shared<Kernel::NullValidator>(),
                  "An output property containing the number of masked tubes", Direction::Output);
}
 
void CreatePSDBleedMask::exec() {
  using Geometry::IDetector_const_sptr;
 
  MatrixWorkspace_const_sptr inputWorkspace = getProperty("InputWorkspace");
  // We require the number of good frames. Check that we have this
  if (!inputWorkspace->run().hasProperty("goodfrm")) {
    throw std::invalid_argument("InputWorkspace does not contain the number of \"good frames\".\n"
                                "(The sample log named: goodfrm with value, specifying number of good "
                                "frames)");
  }
  Kernel::PropertyWithValue<int> *frameProp =
      dynamic_cast<Kernel::PropertyWithValue<int> *>(inputWorkspace->run().getProperty("goodfrm"));
  if (!frameProp) {
    throw std::invalid_argument("InputWorkspace has the number of \"good "
                                "frames\" property (goodfrm log value)"
                                "but this property value is not integer.");
  }
 
  int goodFrames = (*frameProp)();
 
  // Store the other properties
  double maxFramerate = getProperty("MaxTubeFramerate");
 
  // Multiply by the frames to save a division for each bin when we loop over
  // them later
  double maxRate = maxFramerate * goodFrames;
  int numIgnoredPixels = getProperty("NIgnoredCentralPixels");
 
  // This algorithm assumes that the instrument geometry is tube based, i.e. the
  // parent CompAssembly
  // of the lowest detector in the tree is a "tube" and that all pixels in a
  // tube are consecutively ordered
  // with respect to spectra number
  const auto numSpectra = static_cast<int>(inputWorkspace->getNumberHistograms());
  // Keep track of a map of tubes to lists of indices
  using TubeIndex = std::map<size_t, std::vector<int>>;
  TubeIndex tubeMap;
 
  API::Progress progress(this, 0.0, 1.0, numSpectra);
 
  const auto &spectrumInfo = inputWorkspace->spectrumInfo();
  const auto &componentInfo = inputWorkspace->componentInfo();
 
  // NOTE: This loop is intentionally left unparallelized as the majority of the
  // work requires a lock around it which actually slows down the loop.
  // Another benefit of keep it serial is losing the need for a call to 'sort'
  // when
  // performing the bleed test as the list of indices will already be in the
  // correct
  // order
  for (int i = 0; i < numSpectra; ++i) {
    if (!spectrumInfo.hasDetectors(i))
      continue;
 
    if (spectrumInfo.isMonitor(i))
      continue;
 
    // For a group, use the detector with the lowest ID
    const auto detIndex = spectrumInfo.spectrumDefinition(i)[0].first;
    if (!componentInfo.hasParent(detIndex))
      continue;
 
    tubeMap[componentInfo.parent(detIndex)].emplace_back(i);
 
    progress.report();
  }
 
  // Now process the tubes in parallel
  const auto numTubes = static_cast<int>(tubeMap.size());
  g_log.information() << "Found " << numTubes << " tubes.\n";
  int numSpectraMasked(0), numTubesMasked(0);
  // Create a mask workspace for output
  MaskWorkspace_sptr outputWorkspace = this->generateEmptyMask(inputWorkspace);
 
  progress.resetNumSteps(numTubes, 0, 1);
 
  PARALLEL_FOR_IF(Kernel::threadSafe(*inputWorkspace, *outputWorkspace))
  for (int i = 0; i < numTubes; ++i) {
    PARALLEL_START_INTERRUPT_REGION
    auto current = std::next(tubeMap.begin(), i);
    const TubeIndex::mapped_type tubeIndices = current->second;
    bool mask = performBleedTest(tubeIndices, inputWorkspace, maxRate, numIgnoredPixels);
    if (mask) {
      maskTube(tubeIndices, outputWorkspace);
      PARALLEL_ATOMIC
      numSpectraMasked += static_cast<int>(tubeIndices.size());
      PARALLEL_ATOMIC
      numTubesMasked += 1;
    }
 
    progress.report("Performing Bleed Test");
 
    PARALLEL_END_INTERRUPT_REGION
  }
  PARALLEL_CHECK_INTERRUPT_REGION
 
  g_log.information() << numTubesMasked << " tube(s) failed the bleed tests.";
  if (numTubesMasked > 0) {
    g_log.information() << " The " << numSpectraMasked << " spectra have been masked on the output workspace.\n";
  } else {
    g_log.information() << '\n';
  }
 
  setProperty("NumberOfFailures", numSpectraMasked);
  setProperty("OutputWorkspace", outputWorkspace);
}
 
bool CreatePSDBleedMask::performBleedTest(const std::vector<int> &tubeIndices,
                                          const API::MatrixWorkspace_const_sptr &inputWS, double maxRate,
                                          int numIgnoredPixels) {
 
  // Require ordered pixels so that we can define the centre.
  // This of course assumes that the pixel IDs increase monotonically with the
  // workspace index
  // and that the above loop that searched for the tubes was NOT run in parallel
  const size_t numSpectra(tubeIndices.size());
  const size_t midIndex(numSpectra / 2);
  const size_t topEnd(midIndex - numIgnoredPixels / 2);
  const size_t bottomBegin(midIndex + numIgnoredPixels / 2);
 
  bool isRawCounts = !(inputWS->isDistribution());
 
  const auto numBins = static_cast<int>(inputWS->blocksize());
  std::vector<double> totalRate(numBins, 0.0);
  size_t top = 0, bot = bottomBegin;
  for (; top < topEnd; ++top, ++bot) {
    const int topIndex = tubeIndices[top];
    const int botIndex = tubeIndices[bot];
    auto const &topY = inputWS->y(topIndex);
    auto const &botY = inputWS->y(botIndex);
    auto const &topX = inputWS->x(topIndex);
    auto const &botX = inputWS->x(botIndex);
    for (int j = 0; j < numBins; ++j) {
      double topRate(topY[j]), botRate(botY[j]);
      if (isRawCounts) {
        topRate /= (topX[j + 1] - topX[j]);
        botRate /= (botX[j + 1] - botX[j]);
      }
      totalRate[j] += topRate + botRate;
      // If by now any have hit the allowed maximum then mark this to be masked
      if (totalRate[j] > maxRate) {
        return true;
      }
    }
  }
 
  if (top != topEnd) {
    g_log.error() << "Error in tube processing, loop variable has an unexpected value.\n";
    throw std::runtime_error("top != topEnd in CreatePSDBleedMask::performBleedTest()");
  }
  if (bot != numSpectra) {
    g_log.error() << "Error in tube processing, loop variable has an unexpected value.\n";
    throw std::runtime_error("bot != numSpectra  in CreatePSDBleedMask::performBleedTest()");
  }
 
  return false;
}
 
void CreatePSDBleedMask::maskTube(const std::vector<int> &tubeIndices, const API::MatrixWorkspace_sptr &workspace) {
  const double deadValue(1.0); // delete the data
  for (auto tubeIndice : tubeIndices) {
    workspace->mutableY(tubeIndice)[0] = deadValue;
  }
}
} // namespace Mantid::Algorithms