LinearInterpolation.h

// Copyright 2024, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
// OPEN SOURCE LICENSE (MIT)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
 
#pragma once
 
#include "neml2/models/Interpolation.h"
#include "neml2/tensors/Scalar.h"
 
namespace neml2
{
template <typename T>
class LinearInterpolation : public Interpolation<T>
{
public:
  static OptionSet expected_options();
 
  LinearInterpolation(const OptionSet & options);
 
protected:
  void set_value(bool out, bool dout_din, bool d2out_din2) override;
 
private:
  template <typename T2>
  T2 mask(const T2 & in, const Scalar & m) const;
};
class LinearInterpolation : public Interpolation<T> {…};
 
template <typename T>
template <typename T2>
T2
LinearInterpolation<T>::mask(const T2 & in, const Scalar & m) const
{
  // Resulting batch shape
  const auto B = m.batch_sizes().slice(0, -1);
  // Use advanced (boolean) indexing to select the correct interval
  return T2(in.batch_expand_as(m).index({m})).batch_reshape(B);
}
} // namespace neml2