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invlib

invlib is a C++ template library that provides a generic implementation of maximum a-posteriori (MAP) estimators for inverse problems. The aim of the library is to provide a formulation of MAP estimators independent of the data types used for the underlying matrix algebra. This is required to be able to efficiently handle the many different problem sizes that occur in the retrieval of atmospheric remote sensing data.

invlib is currently under development and will be integrated into the open-source atmospheric radiative transfer code ARTS.

Current Features:

  • Generic Formulation: Supports arbitrary matrix and vector types, as well as separate types for Jacobian and covariance matrices.
  • Standard, n-form and m-form formulation of the MAP estimators.
  • Optimization Methods: Gauss-Newton, Levenberg-Marquardt
  • Indirect solver: Provides a conjugate gradient solver for the subproblem of the Gauss-Newton or Levenberg-Marquardt subproblem.
  • Optimized symbolic matrix algebra: The symbolic algebra delays computation of matrix arithmetic operations until it gets converted to the result type. This avoids the computation of expensive matrix-matrix products if the result of the expression is actually a vector.

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Bayesian Methods for Inverse Problems

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