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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

0.6.1 - 2026-01-28

Added

  • Ruff linting in CI (ruff check + ruff format --check).
  • Pre-commit hooks with ruff for local development.
  • pre-commit added to dev dependencies.

Fixed

  • Build Status badge in README (updated to new GitHub Actions format).

0.6.0 - 2026-01-28

Added

  • Flat directory support — input folders without class subdirectories are auto-detected and split directly (#47).
  • group parameter with "stem", "sibling", and callable support for flexible file grouping (#39, #41, #51).
  • group="sibling" mode for splitting parallel directories (e.g. images/ + annotations/) in lockstep (#51).
  • shuffle parameter (True by default) to disable shuffling for time series data (#44).
  • --group, --no-shuffle, and --kfold CLI flags.
  • k-fold cross-validation split via kfold() (#50).
  • fixed="auto" to auto-compute validation size from the smallest class (#40).
  • File format filtering via formats parameter and --formats CLI flag (#38).
  • Symlink support via move="symlink" and --symlink CLI flag (#48).
  • Migrated pyproject.toml to PEP 621 for Poetry 2.x.
  • Replaced black/isort with ruff for linting.

Fixed

  • group_prefix no longer mismatches filenames with shared prefixes (e.g. image_130 vs image_1300) — now matches by Path.stem instead of startswith (#39).
  • Error message in split_class_dir_fixed (#35).
  • Typo: "get get" → "get" (#33).
  • Removed stray debugging print statement.

0.5.1 - 2022-02-03

Fixed

  • shutil.move compatibility for Python <= 3.8 (#32).

Added

  • Tests for pathlib.Path inputs.

0.5.0 - 2022-01-30

Added

  • Warn users if the input folder is not in the expected format (#13).
  • fixed now accepts 3 values to limit the number of training samples (#24).
  • move flag to move files instead of copying (#28).

Fixed

  • Missing items for oversampling with groups.

Changed

  • Switched CI from Travis to GitHub Actions.
  • Dropped Python 3.6, added Python 3.10 support.
  • tqdm moved to optional extras (pip install split-folders[full]).

0.4.3 - 2020-11-01

Fixed

  • Integer fixed parameter handling.
  • Documentation about --ratio CLI usage.

0.4.2 - 2020-08-05

Fixed

  • Oversampling documentation and typos.

0.4.1 - 2020-08-05

Changed

  • Renamed shared_prefix to group_prefix.

0.4.0 - 2020-08-04

Added

  • group_prefix option to group files by shared filename prefix.
  • __version__ attribute.

Changed

  • Switched build system to Poetry.
  • CLI command is now splitfolders (with split_folders and split-folders as aliases).
  • Input folder is now a positional CLI argument.

0.3.1 - 2019-07-30

Changed

  • Require Python 3.6+.

0.3.0 - 2019-07-30

Added

  • Optional progress bar via tqdm (#10).

Fixed

  • Graceful handling when tqdm is not installed.

0.2.3 - 2019-07-05

Fixed

  • Assertion error due to floating-point imprecision in ratio calculations.

0.2.2 - 2019-05-12

Fixed

  • Improved error message when there are not enough files for fixed.

0.2.1 - 2018-11-09

Fixed

  • One file going missing in certain split configurations (#1).

0.2.0 - 2018-10-18

Added

  • Randomized oversampling for imbalanced datasets.
  • Ignore dotfiles during splitting.

0.1.0 - 2018-10-04

Added

  • Initial release.
  • Split folders into train, validation, and test sets.
  • ratio and fixed split modes.
  • Seed for reproducible splits.
  • CLI interface.