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// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2023 Google Inc. All rights reserved.
// http://ceres-solver.org/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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//
// Author: sameeragarwal@google.com (Sameer Agarwal)
#include "ceres/preconditioner.h"
#include "absl/log/check.h"
namespace ceres::internal {
Preconditioner::~Preconditioner() = default;
PreconditionerType Preconditioner::PreconditionerForZeroEBlocks(
PreconditionerType preconditioner_type) {
if (preconditioner_type == SCHUR_JACOBI ||
preconditioner_type == CLUSTER_JACOBI ||
preconditioner_type == CLUSTER_TRIDIAGONAL) {
return JACOBI;
}
return preconditioner_type;
}
SparseMatrixPreconditionerWrapper::SparseMatrixPreconditionerWrapper(
const SparseMatrix* matrix, const Preconditioner::Options& options)
: matrix_(matrix), options_(options) {
CHECK(matrix != nullptr);
}
SparseMatrixPreconditionerWrapper::~SparseMatrixPreconditionerWrapper() =
default;
bool SparseMatrixPreconditionerWrapper::UpdateImpl(const SparseMatrix& /*A*/,
const double* /*D*/) {
return true;
}
void SparseMatrixPreconditionerWrapper::RightMultiplyAndAccumulate(
const double* x, double* y) const {
matrix_->RightMultiplyAndAccumulate(
x, y, options_.context, options_.num_threads);
}
int SparseMatrixPreconditionerWrapper::num_rows() const {
return matrix_->num_rows();
}
} // namespace ceres::internal