mirror of
https://github.com/ceres-solver/ceres-solver.git
synced 2026-08-29 16:40:38 +08:00
Keir Mierle
7492b0d8de
Since Ceres is moving to using GitHub for issues, and the Google Code URL in the current copyright header will soon become invalid, update all the headers. Change-Id: I1fce70375d1bcf098591f07b4d8f01a5c1e0789c
108 lines
4.3 KiB
C++
108 lines
4.3 KiB
C++
// Ceres Solver - A fast non-linear least squares minimizer
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// Copyright 2015 Google Inc. All rights reserved.
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// http://ceres-solver.org/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Author: richie.stebbing@gmail.com (Richard Stebbing)
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#include <cstring>
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#include "ceres/dynamic_compressed_row_sparse_matrix.h"
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namespace ceres {
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namespace internal {
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DynamicCompressedRowSparseMatrix::DynamicCompressedRowSparseMatrix(
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int num_rows,
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int num_cols,
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int initial_max_num_nonzeros)
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: CompressedRowSparseMatrix(num_rows,
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num_cols,
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initial_max_num_nonzeros) {
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dynamic_cols_.resize(num_rows);
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dynamic_values_.resize(num_rows);
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}
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void DynamicCompressedRowSparseMatrix::InsertEntry(int row,
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int col,
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const double& value) {
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CHECK_GE(row, 0);
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CHECK_LT(row, num_rows());
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CHECK_GE(col, 0);
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CHECK_LT(col, num_cols());
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dynamic_cols_[row].push_back(col);
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dynamic_values_[row].push_back(value);
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}
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void DynamicCompressedRowSparseMatrix::ClearRows(int row_start,
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int num_rows) {
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for (int r = 0; r < num_rows; ++r) {
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const int i = row_start + r;
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CHECK_GE(i, 0);
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CHECK_LT(i, this->num_rows());
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dynamic_cols_[i].resize(0);
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dynamic_values_[i].resize(0);
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}
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}
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void DynamicCompressedRowSparseMatrix::Finalize(int num_additional_elements) {
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// `num_additional_elements` is provided as an argument so that additional
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// storage can be reserved when it is known by the finalizer.
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CHECK_GE(num_additional_elements, 0);
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// Count the number of non-zeros and resize `cols_` and `values_`.
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int num_jacobian_nonzeros = 0;
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for (int i = 0; i < dynamic_cols_.size(); ++i) {
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num_jacobian_nonzeros += dynamic_cols_[i].size();
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}
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SetMaxNumNonZeros(num_jacobian_nonzeros + num_additional_elements);
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// Flatten `dynamic_cols_` into `cols_` and `dynamic_values_`
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// into `values_`.
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int index_into_values_and_cols = 0;
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for (int i = 0; i < num_rows(); ++i) {
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mutable_rows()[i] = index_into_values_and_cols;
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const int num_nonzero_columns = dynamic_cols_[i].size();
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if (num_nonzero_columns > 0) {
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memcpy(mutable_cols() + index_into_values_and_cols,
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&dynamic_cols_[i][0],
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dynamic_cols_[i].size() * sizeof(dynamic_cols_[0][0]));
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memcpy(mutable_values() + index_into_values_and_cols,
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&dynamic_values_[i][0],
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dynamic_values_[i].size() * sizeof(dynamic_values_[0][0]));
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index_into_values_and_cols += dynamic_cols_[i].size();
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}
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}
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mutable_rows()[num_rows()] = index_into_values_and_cols;
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CHECK_EQ(index_into_values_and_cols, num_jacobian_nonzeros)
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<< "Ceres bug: final index into values_ and cols_ should be equal to "
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<< "the number of jacobian nonzeros. Please contact the developers!";
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}
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} // namespace internal
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} // namespace ceres
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