SG++-Doxygen-Documentation
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Grid Point based refinement for classification problems solved by a SG density estimation approach. More...
#include <GridPointBasedRefinementFunctor.hpp>
Public Member Functions | |
size_t | getNumGrids () override |
Returns the number of grids the functor can / does refine. More... | |
size_t | getRefinementsNum () const override |
Returns the maximal number of points that should be refined. More... | |
double | getRefinementThreshold () const override |
Returns the threshold for refinement. More... | |
GridPointBasedRefinementFunctor (std::vector< base::Grid *> grids, std::vector< base::DataVector *> alphas, size_t refinements_num=1, bool level_penalize=false, bool pre_compute=false, double threshold=0.0) | |
Constructor. More... | |
double | operator() (base::GridStorage &storage, size_t seq) const override |
This should be returning a refinement value for every grid point. More... | |
void | preComputeEvaluations () override |
Precomputes grid evaluations for all grids. More... | |
void | setGridIndex (size_t grid_index) override |
Sets the index (into the vector of grids) of the grid to be refined. More... | |
double | start () const override |
Returns the lower bound of refinement criterion (e.g., alpha or error) (lower bound). More... | |
virtual | ~GridPointBasedRefinementFunctor () |
Public Member Functions inherited from sgpp::datadriven::MultiGridRefinementFunctor | |
virtual | ~MultiGridRefinementFunctor () |
Public Member Functions inherited from sgpp::base::RefinementFunctor | |
virtual double | getTotalRefinementValue (GridStorage &storage) const |
Returns the total sum of local (error) indicators used for refinement. More... | |
RefinementFunctor () | |
Constructor. More... | |
virtual | ~RefinementFunctor () |
Destructor. More... | |
Protected Attributes | |
std::vector< base::DataVector * > | alphas |
size_t | current_grid_index |
std::vector< base::Grid * > | grids |
bool | level_penalize |
std::vector< std::map< std::string, double > > | pre_comp_evals |
Stores grid evaluations at all grids (vector) at the union of grid point coordinates over all grids (hashed by string representation in the map) More... | |
bool | pre_compute |
size_t | refinements_num |
double | threshold |
Additional Inherited Members | |
Public Types inherited from sgpp::base::RefinementFunctor | |
typedef double | value_type |
Grid Point based refinement for classification problems solved by a SG density estimation approach.
The scoring is only based on function values of the respective PDF at grid points.
sgpp::datadriven::GridPointBasedRefinementFunctor::GridPointBasedRefinementFunctor | ( | std::vector< base::Grid *> | grids, |
std::vector< base::DataVector *> | alphas, | ||
size_t | refinements_num = 1 , |
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bool | level_penalize = false , |
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bool | pre_compute = false , |
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double | threshold = 0.0 |
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Constructor.
grids | Vector of grids. current_grid_index specifies the grid to be refined |
alphas | Vector of surpluses related to the grids |
refinements_num | Maximum number of refinements done |
level_penalize | If a level penalizing is multiplied to the score (2^{|l|_1}) |
pre_compute | Flag for precomputation of necessary grid evals. If true preComputeEvaluations needs to be called before each refinement step |
threshold | Threshold for refinement scores |
References python.statsfileInfo::i, and pre_comp_evals.
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inlinevirtual |
References getNumGrids(), preComputeEvaluations(), and setGridIndex().
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overridevirtual |
Returns the number of grids the functor can / does refine.
Implements sgpp::datadriven::MultiGridRefinementFunctor.
References grids.
Referenced by ~GridPointBasedRefinementFunctor().
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overridevirtual |
Returns the maximal number of points that should be refined.
The maximal number of points to refine is set in the constructor of the implementing class.
Reimplemented from sgpp::base::RefinementFunctor.
References refinements_num.
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overridevirtual |
Returns the threshold for refinement.
Only the grid points with absolute value of refinement criterion (e.g., alpha or error) greater or equal to this threshold will be refined.
Implements sgpp::base::RefinementFunctor.
References threshold.
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overridevirtual |
This should be returning a refinement value for every grid point.
The point with the highest value will be refined first.
storage | reference to the grids storage object |
seq | sequence number in the coefficients array |
Implements sgpp::base::RefinementFunctor.
References alphas, sgpp::op_factory::createOperationEval(), current_grid_index, sgpp::base::HashGridStorage::getDimension(), sgpp::base::HashGridPoint::getLevelSum(), sgpp::base::HashGridStorage::getPoint(), sgpp::base::HashGridPoint::getStandardCoordinates(), grids, python.statsfileInfo::i, level_penalize, friedman::p, sgpp::combigrid::pow(), pre_comp_evals, and pre_compute.
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overridevirtual |
Precomputes grid evaluations for all grids.
Used in combination with pre_compute flag = true. Should be called before refinement is done and needs to be re-called after a refinement step is over ie. the surplus vectors got recomputed
Reimplemented from sgpp::datadriven::MultiGridRefinementFunctor.
References alphas, sgpp::op_factory::createOperationEval(), grids, python.statsfileInfo::i, python.utils.statsfile2gnuplot::j, friedman::p, and pre_comp_evals.
Referenced by ~GridPointBasedRefinementFunctor().
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overridevirtual |
Sets the index (into the vector of grids) of the grid to be refined.
grid_index | The index of the grid to be refined |
Implements sgpp::datadriven::MultiGridRefinementFunctor.
References current_grid_index.
Referenced by ~GridPointBasedRefinementFunctor().
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overridevirtual |
Returns the lower bound of refinement criterion (e.g., alpha or error) (lower bound).
The refinement value of grid points to be refined have to be larger than this value
Implements sgpp::base::RefinementFunctor.
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protected |
Referenced by operator()(), and preComputeEvaluations().
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Referenced by operator()(), and setGridIndex().
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Referenced by getNumGrids(), operator()(), and preComputeEvaluations().
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Referenced by operator()().
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Stores grid evaluations at all grids (vector) at the union of grid point coordinates over all grids (hashed by string representation in the map)
Referenced by GridPointBasedRefinementFunctor(), operator()(), and preComputeEvaluations().
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Referenced by operator()().
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Referenced by getRefinementsNum().
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Referenced by getRefinementThreshold().