| // Ceres Solver - A fast non-linear least squares minimizer |
| // Copyright 2015 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: |
| // |
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| // 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 |
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| // specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| // |
| // Author: sameeragarwal@google.com (Sameer Agarwal) |
| |
| #ifndef CERES_INTERNAL_BLOCK_RANDOM_ACCESS_DIAGONAL_MATRIX_H_ |
| #define CERES_INTERNAL_BLOCK_RANDOM_ACCESS_DIAGONAL_MATRIX_H_ |
| |
| #include <memory> |
| #include <set> |
| #include <utility> |
| #include <vector> |
| |
| #include "ceres/block_random_access_matrix.h" |
| #include "ceres/internal/port.h" |
| #include "ceres/triplet_sparse_matrix.h" |
| #include "ceres/types.h" |
| |
| namespace ceres { |
| namespace internal { |
| |
| // A thread safe block diagonal matrix implementation of |
| // BlockRandomAccessMatrix. |
| class CERES_EXPORT_INTERNAL BlockRandomAccessDiagonalMatrix |
| : public BlockRandomAccessMatrix { |
| public: |
| // blocks is an array of block sizes. |
| explicit BlockRandomAccessDiagonalMatrix(const std::vector<int>& blocks); |
| BlockRandomAccessDiagonalMatrix(const BlockRandomAccessDiagonalMatrix&) = |
| delete; |
| void operator=(const BlockRandomAccessDiagonalMatrix&) = delete; |
| |
| // The destructor is not thread safe. It assumes that no one is |
| // modifying any cells when the matrix is being destroyed. |
| virtual ~BlockRandomAccessDiagonalMatrix(); |
| |
| // BlockRandomAccessMatrix Interface. |
| CellInfo* GetCell(int row_block_id, |
| int col_block_id, |
| int* row, |
| int* col, |
| int* row_stride, |
| int* col_stride) final; |
| |
| // This is not a thread safe method, it assumes that no cell is |
| // locked. |
| void SetZero() final; |
| |
| // Invert the matrix assuming that each block is positive definite. |
| void Invert(); |
| |
| // y += S * x |
| void RightMultiply(const double* x, double* y) const; |
| |
| // Since the matrix is square, num_rows() == num_cols(). |
| int num_rows() const final { return tsm_->num_rows(); } |
| int num_cols() const final { return tsm_->num_cols(); } |
| |
| const TripletSparseMatrix* matrix() const { return tsm_.get(); } |
| TripletSparseMatrix* mutable_matrix() { return tsm_.get(); } |
| |
| private: |
| // row/column block sizes. |
| const std::vector<int> blocks_; |
| std::vector<CellInfo*> layout_; |
| |
| // The underlying matrix object which actually stores the cells. |
| std::unique_ptr<TripletSparseMatrix> tsm_; |
| |
| friend class BlockRandomAccessDiagonalMatrixTest; |
| }; |
| |
| } // namespace internal |
| } // namespace ceres |
| |
| #endif // CERES_INTERNAL_BLOCK_RANDOM_ACCESS_DIAGONAL_MATRIX_H_ |