dense_train_tools.hpp File Reference

Shared dense-training helpers: standardized-design build and Cholesky factor/solve. More...

#include <cmath>
#include <cstddef>
#include <memory>
#include <vector>
#include "data_accessor.hpp"

Go to the source code of this file.

Namespaces
namespace	FST
	The Feature Selection Toolbox 4 library: every library component – data access, criteria and classifiers, search algorithms, result trackers and the global infrastructure – lives in this namespace.

Functions
template<typename REALTYPE, typename IDXTYPE, typename DIMTYPE, class DATAACCESSOR, class AFTERPATTERN>
std::size_t	FST::standardize_design (const std::shared_ptr< DATAACCESSOR > &da, const DIMTYPE classes, const std::size_t d, const std::size_t zstride, const std::vector< DIMTYPE > &index, std::vector< REALTYPE > &Z, std::vector< REALTYPE > &mean, std::vector< REALTYPE > &scale, AFTERPATTERN after_pattern)
template<typename REALTYPE>
bool	FST::cholesky_factor (std::vector< REALTYPE > &A, const std::size_t m)
template<typename REALTYPE>
void	FST::cholesky_solve (const std::vector< REALTYPE > &A, const std::size_t m, const REALTYPE *rhs, const bool negate_rhs, REALTYPE *out)

Detailed Description

Shared dense-training helpers: standardized-design build and Cholesky factor/solve.

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Feature Selection Toolbox 4 source code

Author

Petr Somol (somol.nosp@m.@uti.nosp@m.a.cas.nosp@m..cz) with collaborators, see Contacts at https://fst.utia.cz

Version 4 was developed with Anthropic Claude models as coding assistants: Claude Fable 5 for the 2026 development (with minor contributions by Claude Opus 5), Claude Fable 5.1 for the pre-publication reviews of the full codebase, and Claude Opus 4.5 for the December 2025 audit of the FST3 codebase; design, decisions, review and acceptance are human work

Date

July 2026

Version

4.2.0

Note

FST4 was developed using MinGW-W64 g++ 15.2 and requires

• a C++17 conforming compiler and standard library (no Boost, unlike FST3),

• (optionally) LibSVM (http://www.csie.ntu.edu.tw/~cjlin/libsvm/, version 3.37; not distributed with FST4 — drop svm.cpp/svm.h into ./libsvm/, see libsvm/readme.txt)

Note that LibSVM is required for SVM related tools only.