MappingConfiguration.hpp

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#pragma once
 
#include <string>
#include <vector>
#include "logging/Logger.hpp"
#include "mapping/Mapping.hpp"
#include "mapping/SharedPointer.hpp"
#include "mapping/config/MappingConfigurationTypes.hpp"
#include "mesh/SharedPointer.hpp"
#include "xml/XMLTag.hpp"
 
namespace precice::mapping {
 
class MappingConfiguration : public xml::XMLTag::Listener {
public:
  enum Direction {
    WRITE,
    READ
  };
 
  struct ConfiguredMapping {
    PtrMapping mapping;
    mesh::PtrMesh fromMesh;
    mesh::PtrMesh toMesh;
    Direction direction;
    bool requiresBasisFunction;
    bool configuredWithAliasTag = false;
  };
 
  struct GinkgoParameter {
    std::string  executor            = "reference-executor";
    std::string  solver              = "cg-solver";
    std::string  preconditioner      = "jacobi-preconditioner";
    double       residualNorm        = 1e-8;
    std::size_t  maxIterations       = 1e6;
    bool         usePreconditioner   = false;
    unsigned int jacobiBlockSize     = 4;
    unsigned int deviceId            = 0;
    unsigned int nThreads            = 0;
    bool         enableUnifiedMemory = false;
  };
 
  MappingConfiguration(
      xml::XMLTag &              parent,
      mesh::PtrMeshConfiguration meshConfiguration);
 
  void setExperimental(bool experimental);
 
  virtual void xmlTagCallback(
      const xml::ConfigurationContext &context,
      xml::XMLTag &                    callingTag);
 
  virtual void xmlEndTagCallback(
      const xml::ConfigurationContext &context,
      xml::XMLTag &                    callingTag);
 
  const std::vector<ConfiguredMapping> &mappings();
 
  // Only relevant for RBF related mappings
  // Being public here is only required for testing purposes
  struct RBFConfiguration {
 
    enum struct SystemSolver {
      GlobalDirect,
      GlobalIterative,
      PUMDirect
    };
    SystemSolver        solver{};
    std::array<bool, 3> deadAxis{};
    Polynomial          polynomial{};
    double              solverRtol{};
    int                 verticesPerCluster{};
    double              relativeOverlap{};
    bool                projectToInput{};
    BasisFunction       basisFunction{};
    double              supportRadius{};
    double              shapeParameter{};
    bool                basisFunctionDefined = false;
  };
 
  struct GeoMultiscaleConfiguration {
 
    double      multiscaleRadius{};
    std::string multiscaleType{};
    int         multiscaleAxis{};
  };
 
  const RBFConfiguration &rbfConfig() const
  {
    return _rbfConfig;
  }
 
  void resetMappings()
  {
    _mappings.clear();
  }
 
private:
  mutable logging::Logger _log{"config:MappingConfiguration"};
 
  bool _experimental = false;
 
  const std::string TAG = "mapping";
 
  // First, declare common attributes and associated options
  const std::string ATTR_TYPE                        = "type";
  const std::string TYPE_NEAREST_NEIGHBOR            = "nearest-neighbor";
  const std::string TYPE_NEAREST_NEIGHBOR_GRADIENT   = "nearest-neighbor-gradient";
  const std::string TYPE_NEAREST_PROJECTION          = "nearest-projection";
  const std::string TYPE_LINEAR_CELL_INTERPOLATION   = "linear-cell-interpolation";
  const std::string TYPE_RBF_GLOBAL_DIRECT           = "rbf-global-direct";
  const std::string TYPE_RBF_GLOBAL_ITERATIVE        = "rbf-global-iterative";
  const std::string TYPE_RBF_PUM_DIRECT              = "rbf-pum-direct";
  const std::string TYPE_RBF_ALIAS                   = "rbf";
  const std::string TYPE_AXIAL_GEOMETRIC_MULTISCALE  = "axial-geometric-multiscale";
  const std::string TYPE_RADIAL_GEOMETRIC_MULTISCALE = "radial-geometric-multiscale";
 
  const std::string ATTR_DIRECTION  = "direction";
  const std::string DIRECTION_WRITE = "write";
  const std::string DIRECTION_READ  = "read";
 
  const std::string ATTR_FROM = "from";
  const std::string ATTR_TO   = "to";
 
  const std::string ATTR_CONSTRAINT                      = "constraint";
  const std::string CONSTRAINT_CONSISTENT                = "consistent";
  const std::string CONSTRAINT_CONSERVATIVE              = "conservative";
  const std::string CONSTRAINT_SCALED_CONSISTENT_SURFACE = "scaled-consistent-surface";
  const std::string CONSTRAINT_SCALED_CONSISTENT_VOLUME  = "scaled-consistent-volume";
 
  // RBF specific options
  const std::string ATTR_X_DEAD = "x-dead";
  const std::string ATTR_Y_DEAD = "y-dead";
  const std::string ATTR_Z_DEAD = "z-dead";
 
  const std::string ATTR_POLYNOMIAL     = "polynomial";
  const std::string POLYNOMIAL_SEPARATE = "separate";
  const std::string POLYNOMIAL_ON       = "on";
  const std::string POLYNOMIAL_OFF      = "off";
 
  // For iterative RBFs
  const std::string ATTR_SOLVER_RTOL = "solver-rtol";
 
  // For the future
  // const std::string ATTR_PARALLELISM           = "parallelism";
  // const std::string PARALLELISM_GATHER_SCATTER = "gather-scatter";
  // const std::string PARALLELISM                = "distributed";
 
  // For PUM
  const std::string ATTR_VERTICES_PER_CLUSTER = "vertices-per-cluster";
  const std::string ATTR_RELATIVE_OVERLAP     = "relative-overlap";
  const std::string ATTR_PROJECT_TO_INPUT     = "project-to-input";
 
  // We declare the basis function as subtag
  const std::string SUBTAG_BASIS_FUNCTION = "basis-function";
  const std::string RBF_TPS               = "thin-plate-splines";
  const std::string RBF_MULTIQUADRICS     = "multiquadrics";
  const std::string RBF_INV_MULTIQUADRICS = "inverse-multiquadrics";
  const std::string RBF_VOLUME_SPLINES    = "volume-splines";
  const std::string RBF_GAUSSIAN          = "gaussian";
  const std::string RBF_CTPS_C2           = "compact-tps-c2";
  const std::string RBF_CPOLYNOMIAL_C0    = "compact-polynomial-c0";
  const std::string RBF_CPOLYNOMIAL_C2    = "compact-polynomial-c2";
  const std::string RBF_CPOLYNOMIAL_C4    = "compact-polynomial-c4";
  const std::string RBF_CPOLYNOMIAL_C6    = "compact-polynomial-c6";
  const std::string RBF_CPOLYNOMIAL_C8    = "compact-polynomial-c8";
 
  // Attributes for the subtag
  const std::string ATTR_SHAPE_PARAM    = "shape-parameter";
  const std::string ATTR_SUPPORT_RADIUS = "support-radius";
 
  // Attributes for geometric multiscale
  const std::string ATTR_GEOMETRIC_MULTISCALE_TYPE    = "multiscale-type";
  const std::string ATTR_GEOMETRIC_MULTISCALE_AXIS    = "multiscale-axis";
  const std::string ATTR_GEOMETRIC_MULTISCALE_RADIUS  = "multiscale-radius";
  const std::string GEOMETRIC_MULTISCALE_TYPE_SPREAD  = "spread";
  const std::string GEOMETRIC_MULTISCALE_TYPE_COLLECT = "collect";
  const std::string GEOMETRIC_MULTISCALE_AXIS_X       = "x";
  const std::string GEOMETRIC_MULTISCALE_AXIS_Y       = "y";
  const std::string GEOMETRIC_MULTISCALE_AXIS_Z       = "z";
 
  // For iterative RBFs using Ginkgo
  const std::string SUBTAG_EXECUTOR = "executor";
  const std::string EXECUTOR_CPU    = "cpu";
  const std::string EXECUTOR_CUDA   = "cuda";
  const std::string EXECUTOR_HIP    = "hip";
  const std::string EXECUTOR_OMP    = "openmp";
 
  const std::string ATTR_DEVICE_ID = "gpu-device-id";
  const std::string ATTR_N_THREADS = "n-threads";
  // const std::string ATTR_ENABLE_UNIFIED_MEMORY = "enable-unified-memory";
  // const std::string ATTR_SOLVER                = "solver";
  // const std::string ATTR_USE_PRECONDITIONER    = "use-preconditioner";
  // const std::string ATTR_PRECONDITIONER        = "preconditioner";
  // const std::string ATTR_JACOBI_BLOCK_SIZE     = "jacobi-block-size";
  // const std::string ATTR_MAX_ITERATIONS        = "max-iterations";
 
  // mapping constraint
  Mapping::Constraint constraintValue{};
 
  mesh::PtrMeshConfiguration _meshConfig;
 
  // main data structure storing the configurations
  std::vector<ConfiguredMapping> _mappings;
 
  // Relevant information in order to store the RBF related settings,
  // as we can only instantiate the RBF classes when we know the RBF
  // which is configured in the subtag
  RBFConfiguration _rbfConfig;
 
  struct ExecutorConfiguration {
    enum struct Executor {
      CPU,
      CUDA,
      HIP,
      OpenMP
    };
 
    Executor executor = Executor::CPU;
    int      deviceId{};
    int      nThreads{};
  };
 
  std::unique_ptr<ExecutorConfiguration> _executorConfig;
 
  // Settings for the iterative solvers provided by Ginkgo
  GinkgoParameter _ginkgoParameter;
 
  ConfiguredMapping createMapping(
      const std::string &direction,
      const std::string &type,
      const std::string &fromMeshName,
      const std::string &toMeshName,
      const std::string &geoMultiscaleType,
      const std::string &geoMultiscaleAxis,
      const double &     multiscaleRadius) const;
 
  RBFConfiguration configureRBFMapping(const std::string &type,
                                       const std::string &polynomial,
                                       bool xDead, bool yDead, bool zDead,
                                       double solverRtol,
                                       double verticesPerCluster,
                                       double relativeOverlap,
                                       bool   projectToInput) const;
 
  void finishRBFConfiguration();
 
  void checkDuplicates(const ConfiguredMapping &mapping);
 
  bool requiresBasisFunction(const std::string &mappingType) const;
 
  BasisFunction parseBasisFunctions(const std::string &basisFctName) const;
};
} // namespace precice::mapping