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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
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Author: richie.stebbing@gmail.com (Richard Stebbing)
#include "ceres/dynamic_compressed_row_sparse_matrix.h"
#include <cstring>
namespace ceres::internal {
DynamicCompressedRowSparseMatrix::DynamicCompressedRowSparseMatrix(
int num_rows, int num_cols, int initial_max_num_nonzeros)
: CompressedRowSparseMatrix(num_rows, num_cols, initial_max_num_nonzeros) {
dynamic_cols_.resize(num_rows);
dynamic_values_.resize(num_rows);
}
void DynamicCompressedRowSparseMatrix::InsertEntry(int row,
int col,
const double& value) {
CHECK_GE(row, 0);
CHECK_LT(row, num_rows());
CHECK_GE(col, 0);
CHECK_LT(col, num_cols());
dynamic_cols_[row].push_back(col);
dynamic_values_[row].push_back(value);
}
void DynamicCompressedRowSparseMatrix::ClearRows(int row_start, int num_rows) {
for (int r = 0; r < num_rows; ++r) {
const int i = row_start + r;
CHECK_GE(i, 0);
CHECK_LT(i, this->num_rows());
dynamic_cols_[i].resize(0);
dynamic_values_[i].resize(0);
}
}
void DynamicCompressedRowSparseMatrix::Finalize(int num_additional_elements) {
// `num_additional_elements` is provided as an argument so that additional
// storage can be reserved when it is known by the finalizer.
CHECK_GE(num_additional_elements, 0);
// Count the number of non-zeros and resize `cols_` and `values_`.
int num_jacobian_nonzeros = 0;
for (const auto& dynamic_col : dynamic_cols_) {
num_jacobian_nonzeros += dynamic_col.size();
}
SetMaxNumNonZeros(num_jacobian_nonzeros + num_additional_elements);
// Flatten `dynamic_cols_` into `cols_` and `dynamic_values_`
// into `values_`.
int index_into_values_and_cols = 0;
for (int i = 0; i < num_rows(); ++i) {
mutable_rows()[i] = index_into_values_and_cols;
const int num_nonzero_columns = dynamic_cols_[i].size();
if (num_nonzero_columns > 0) {
memcpy(mutable_cols() + index_into_values_and_cols,
&dynamic_cols_[i][0],
dynamic_cols_[i].size() * sizeof(dynamic_cols_[0][0]));
memcpy(mutable_values() + index_into_values_and_cols,
&dynamic_values_[i][0],
dynamic_values_[i].size() * sizeof(dynamic_values_[0][0]));
index_into_values_and_cols += dynamic_cols_[i].size();
}
}
mutable_rows()[num_rows()] = index_into_values_and_cols;
CHECK_EQ(index_into_values_and_cols, num_jacobian_nonzeros)
<< "Ceres bug: final index into values_ and cols_ should be equal to "
<< "the number of jacobian nonzeros. Please contact the developers!";
}
} // namespace ceres::internal