PolynomialChaosTrainer.h

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#pragma once

#include "SurrogateTrainer.h"
#include "PolynomialQuadrature.h"
#include "QuadratureSampler.h"
#include "MultiDimPolynomialGenerator.h"
#include "Calculators.h"

#include "Distribution.h"

typedef StochasticTools::Calculator<std::vector<Real>, Real> RealCalculator;

class PolynomialChaosTrainer : public SurrogateTrainer
{
public:
  static InputParameters validParams();
  PolynomialChaosTrainer(const InputParameters & parameters);
  virtual void preTrain() override;
  virtual void train() override;
  virtual void postTrain() override;

private:
  const std::vector<Real> & _predictor_row;

  const unsigned int & _order;

  unsigned int & _ndim;

  std::vector<std::vector<unsigned int>> & _tuple;

  std::size_t & _ncoeff;

  std::vector<Real> & _coeff;

  std::vector<std::unique_ptr<const PolynomialQuadrature::Polynomial>> & _poly;

  unsigned int _rtype;

  const Real & _ridge_penalty;

  QuadratureSampler * _quad_sampler;

  std::vector<std::unique_ptr<RealCalculator>> _calculators;
  Real _r_sum;

  DenseMatrix<Real> _matrix;
  DenseVector<Real> _rhs;
};