subset.hpp File Reference

Stores the info on currently selected features, enables generating permutations, etc. More...

#include <memory>
#include <cassert>
#include <iostream>
#include <cstdlib>
#include "fst_rand.hpp"
#include "error.hpp"
#include "global.hpp"

Go to the source code of this file.

Classes
class	FST::Subset< BINTYPE, DIMTYPE >
	Stores the info on currently selected features, enables generating permutations, etc. More...
class	FST::Subset< BINTYPE, DIMTYPE >::Feature_Range
	Read-only forward range over feature indices. More...
class	FST::Subset< BINTYPE, DIMTYPE >::Feature_Range::iterator
	Forward iterator over raw feature indices matching a Kind, skipping non-matching ones. More...

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<class BINTYPE, typename DIMTYPE>
std::ostream &	FST::operator<< (std::ostream &os, const Subset< BINTYPE, DIMTYPE > &tdb)
	Streams a subset's size and selected feature indices to os, e.g. "Subset<n=20, d=3>: 2 5 11". The listed indices are those with a positive raw marker, so in backward mode they are the DEselected ones. In builds compiled with the DEBUG macro defined, the raw marker array is dumped before the index list (separated by " ~ "), which makes such output differ from a release build's.

Detailed Description

Stores the info on currently selected features, enables generating permutations, etc.

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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

March 2011 (last updated 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. Ready-to-run SVM examples: demos/demo12t.cfg, demo23.cfg, demo25t.cfg and demo32t.cfg (configurations of the fst4 command-line tool).