CHANGELOG.md

Changelog

Notes:

• Versioning: The versioning scheme depends on the Khiops version supported (first 3 digits) and a Khiops Python Library correlative (4th digit).
  • Example: 10.2.1.4 is the 5th version that supports khiops 10.2.1.
• Internals: Changes in Internals sections are unlikely to be of interest for data scientists.

Unreleased

Added

• (sklearn) keep_selected_variables_only parameter to the predictors (KhiopsClassifier and KhiopsRegressor)

Changed

• (core) Rename variable_part_dimensions to inner_variable_dimensions in Coclustering results.

11.0.0.3 - 2026-03-06

Added

• (sklearn) n_feature_parts parameter to the supervised estimators

Fixed

• (sklearn) Default value of n_features for the supervised estimators.
• Internals:
  • Detection of unsupported installation modes on Windows operating systems.

11.0.0.2 - 2026-01-26

Fixed

• (core) Samples dir path construction when HOME is a remote path

11.0.0.1 - 2026-01-14

Fixed

• (General) Automatic Credentials Discovery-based credential retrieval for Google cloud storage (GCS).
• (sklearn) Temporary directory race condition in estimators.

11.0.0.0 - 2025-12-19

Added

• (General) Support for Python 3.14.
• (General) Warnings and error messages for unsupported installation setups.
• (core) Dictionary API support for dictionary, variable and variable block comments, and dictionary and variable block internal comments.
• (core) Dictionary Rule class and supporting API for serializing Rule instances.
• (core) New way to add a variable to a dictionary using a complete specification.
• (core) New API constants for rules used in automatic variable construction:
  • DEFAULT_CONSTRUCTION_RULES: names of table and entity construction rules, which are applied by default
  • CALENDRICAL_CONSTRUCTION_RULES: names of date, time and timestamp rules.
• (sklearn) Text Khiops type support at the estimator level.

Changed

• (General) Pip packages are published on PyPI.
• (General) Conda packages only depend on the conda-forge channel and are published on conda-forge.
• (core) Dictionary API (DictionaryDomain, Dictionary, MetaData), when a requested key is not found in getters, return None instead of raising a KeyError exception.

Removed

• (sklearn) Remove the n_features_evaluated_, feature_evaluated_names, feature_evaluated_importances_, n_features_used_, feature_used_names_ and feature_used_importances_ Khiops classifier and regressor estimator attributes.

Fixed

• (General) Inconsistency between the tools.download_datasets function and the current samples directory according to core.api.get_samples_dir().

11.0.0.0-b.0 - 2025-07-10

Added

• (core) API support for predictor interpretation and reinforcement.
• (core) API support for instance-variable coclustering model training.
• (core) Support for text types in prediction and coclustering models.
• (core) Analysis and coclustering report JSON serialization support.
• (sklearn) Automatic removal of newline characters in strings on Pandas dataframe columns. This is to ensure the proper working of the Khiops engine.

Changed

• (core) Syntax for additional data tables specification, which uses the data paths.
• (core) API specification of the results path: full paths to report files are now used instead of result directories.
• (sklearn) Specification of the hierarchical multi-table schemata, which now uses data paths as in the Core API.
• (general) Various other changes and updates for Khiops 11.0.0-b.0 compatibility.

Deprecated

• (core) The results directory parameter of the Core API functions. The full path to the reports must now be specified instead.
• (core) The "``"-based secondary table path specification. The "/"-based data paths must now be used instead.
• (sklearn) The specification syntax for hierarchical multi-table datasets. The "/"-based data paths must now be used instead, as in the Core API.

Removed

• (general) All functions, attributes and features that had been deprecated in the 10.3.2.0 version.

10.3.2.0 - 2025-07-03

Fixed

• (sklearn) Documentation display for the train_test_split_dataset sklearn helper function.

10.3.1.0 - 2025-04-16

Added

• (sklearn) Support for boolean and float targets in KhiopsClassifier.

Fixed

• (sklearn) Crash when there were no informative trees in predictors.

Deprecated

• (core) The build_multi_table_dictionary_domain helper function.

10.3.0.0 - 2025-02-10

Fixed

• (core) Dictionary file .json extension check in the khiops.dictionary.read_dictionary_file function.

Changed

• (sklearn) The train_test_split_dataset helper has been moved from khiops.utils to khiops.sklearn.
• (sklearn) The transform_pairs parameter of the KhiopsEncoder sklearn estimator has been renamed to transform_type_pairs.

Removed

• (sklearn) The is_fitted_ estimator attribute. The Scikit-learn check_is_fitted function can be used to test the fitted state of the estimators.
• (sklearn) The n_pairs parameter of the KhiopsRegressor sklearn estimator. It was never supported.

10.2.4.0 - 2024-12-19

Added

• (General) Support for Python 3.13.
• (General) visualize_report helper function to open reports with the Khiops Visualization and Khiops Co-Visualization app.

Fixed

• (General) Initialization failing in Conda-based environments.

Changed

• (core) Support for system parameters has been moved from the KhiopsLocalRunner to the core API.
• (core) System parameter max_memory_mb has been renamed to memory_limit_mb.
• (core) System parameter khiops_temp_dir has been renamed to temp_dir.

Removed

• (General) Khiops Python 9 compatibility.

10.2.3.0 - 2024-11-13

Added

• (sklearn) train_test_split_dataset helper function to ease the splitting in train/test for multi-table datasets.
• (sklearn) Complete support for core API functions parameters in the sklearn estimators.

Changed

• (General) The Conda package only depends on the conda-forge and khiops channels.
• Internals:
  • Improve and simplify the integration with the khiops-core package via its khiops_env script.

10.2.2.4 - 2024-08-05

Added

• (sklearn) Sklearn's attributes for supervised estimators.

10.2.2.3 - 2024-08-02

Fixed

• (core) API functions handling of unknown parameters: they now fail.
• Internals:
  • Detection of the path to the MPI command: the real path to the executable is now used.

10.2.2.2 - 2024-07-19

Fixed

• (core) Documentation of the specific_pairs parameter for the train_predictor and train_recoder core API functions.

Deprecated

• (core) The following parameters of the train_predictor core API functions:
  • max_groups
  • max_intervals
  • min_group_frequency
  • min_interval_frequency
  • results_prefix
  • snb_predictor
  • univariate_predictor_number
  • discretization_method for supervised learning
  • grouping_method for supervised learning

10.2.2.1 - 2024-07-05

Changed

• Internals:
  • The OpenMPI backend now executes with the --allow-run-as-root option.

10.2.2.0 - 2024-07-03

Added

• (sklearn) Support for sparse arrays in sklearn estimators.

Changed

• Internals:
  • MPI backend from MPICH to OpenMPI for native + Pip-based Linux installations.

Fixed

• core
  • Metric name search in estimator analysis report.

10.2.1.0 - 2024-03-26

Added

• (sklearn) 1:1 relations to multi-table datasets.
• (sklearn) Estimators' fit methods now accept single-column pandas dataframes as y target.

Changed

• (core) Improve user error and warning messaging.

Fixed

• (General) Reinstate Rocky Linux 8 support.

10.2.0.0 - 2024-02-15

Note: This release marks the open sourcing of Khiops:

• The khiops package replaces the old pykhiops package. We recommend to uninstall pykhiops before installing khiops. More information at the Khiops site.
• The khiops package uses a new four digit versioning convention.
• The khiops conda package is available for many environments. See the Khiops site for more information.

Added

• General:
  • khiops-python is now available with conda khiops package. This package bundles khiops-python and the Khiops binaries so no system-wide Khiops installation is needed. More information at the Khiops website.
  • Support for python 3.12.
• sklearn
  • Estimator classes can now be trained from Numpy arrays in single-table mode.
• core
  • stdout_file_path and stderr_file_path parameters for khiops.core.api functions. These parameters allow to save the stdout/stderr output of the Khiops execution.

Changed

• sklearn
  • Estimator classes now comply with scikit-learn standards.
• core
  • The JSON initialization of AnalysisResults, CoclusteringResults and its component classes is coherent with the empty initialization.

Fixed

• core
  • Wrong default discretization and grouping methods in train_predictor and train_recoder.
  • KhiopsDockerRunner checking the existence shared_dir on remote paths.

10.1.3 - 2023-06-14

Added

• sklearn:
  • Direct support for coclustering simplification, via the KhiopsCoclustering.simplify method.
• Internals:
  • The TaskRegistry.set_task_end_version method for specifying the ending Khiops version for a task.

Fixed

• sklearn:
  • Verbose mode support is now complete for coclustering.
• Internals:
  • User-provided scenario prologue is now taken into account into the tasks.

Changed

• General:
  • License has been updated to BSD-3 Clear.
• sklearn:
  • auto_sort replaces internal_sort to control input table sorting in estimators.
  • The multi-table documentation has been streamlined to be more precise and clearer.

Deprecated

• sklearn:
  • The max_part_numbers parameter of KhiopsCoclustering fit method. The KhiopsClustering simplify method now contains the simplification feature.
  • The internal_sort estimator parameter. The auto_sort estimator parameter replaces it.
• core:
  • The build_multi_table_dictionary API function. The build_multi_table_dictionary_domain helper function provides the same functionality.
• Internals:
  • The build_multi_table_dictionary task. This task will not be supported after Khiops 11.

10.1.2 - 2023-03-14

Added

• sklearn:
  • Support for snowflake database schemas.
• core:
  • Support for Khiops on MacOS.

Fixed

• core:
  • Khiops coclustering is not executed with MPI anymore.
  • Bug when the JSON reports had colliding character ranges but no particular colliding character.

Changed

• Internals:
  • The transformation of the core.api function parameters to scenario files has now an additional layer mediated by the KhiopsTask class. These objects have all the necessary information about a particular Khiops tasks (ex. train_predictor) to transform its parameters to an scenario file. Furthermore, this allows to export the task signatures to API description languages such as Protocol Buffers.
  • The core.filesystem now exposes its API as a set of functions instead of resource objects. They are still available but the API should be prioritized for its use.

Removed

• General:
  • Support for Python 3.6, pyKhiops 10.1.1 was the last version to support it.

10.1.1 - 2022-11-10

Added

• General:
  • Jupyter notebooks tutorials to the documentation site.
  • pk-status script to check the pyKhiops installation.

Fixed

• General:
  • Code samples scripts not being installed: They are located in <pykhiops_install_dir>/samples.
• sklearn
  • KhiopsCoclustering raising an exception instead of a warning when no informative coclustering was found.
  • internal_sort parameter being ignored in KhiopsCoclustering.
• core
  • detect_format failing when the Khiops log had extra output.

10.1.0 - 2022-09-20

Added

• sklearn:
  • Estimators now accept dataframes with numerical column indexes.
  • KhiopsClassifier now accepts integer target vectors.
  • classes_ estimator attribute for KhiopsClassifier (available once fitted).
  • feature_names_out_ estimator attribute for KhiopsEncoder (available once fitted).
  • export_report_file and export_dictionary_file to export Khiops report and dictionary files once the estimators are fitted.
  • internal_sort parameter for estimators that may be used to not sort the tables on the internal procedures of pyKhiops (default is True). Disabling it may give speed gains in large datasets.
  • verbose flag for debugging estimators: It shows internal information and doesn't erase temporary files.
• core:
  • get_khiops_version API function.
  • New rule LocalTimestamp rule for AutoML feature generation (requires Khiops 10.1).
  • max_total_parts parameter to simplify_coclustering core API function (requires Khiops 10.1).
• Internals:
  • Khiops samples directory in Linux now defaults to /opt/khiops/samples which is where it is installed by default.

Changed

• sklearn:
  • Breaking: Estimators return NumPy arrays instead of dataframes in predict, predict_proba, transform, fit_predict and fit_transform methods.
• core:
  • train_recoder API function does not build trees by default anymore.
  • When pyKhiops reads a legacy Khiops JSON report/dictionary with Unicode decoding errors it now only warns and loads it anyway with the errors="replace" setting. Before it raised an exception.
• General:
  • Simpler multi-table samples in the documentation.

Deprecated

• sklearn:
  • Datasets based on file paths. From pyKhiops 11 only in-memory datasets will be accepted. File based treatments can be treated with the core API.
  • max_part_number as instance parameter of KhiopsCoclustering. It is now a fit parameter. It will be eliminated in pyKhiops 11.
• core:
  • get_khiops_info and get_khiops_coclustering API functions. From Khiops 10.1 there is no need of license key so these methods have no use anymore. They are kept deprecated for backwards compatibility only. It will be eliminated in pyKhiops 11.

Removed

• Internals:
  • legacy_mode in PyKhiopsRunner. It its place there is generic versioning scheme to handle features and Khiops scenarios.

Fixed

• sklearn:
  • Bug in dataframe-based datasets with numerical key columns

10.0.5 - 2022-07-04

Added

• sklearn:
  • A new way to specify multi-table inputs for estimators via a dict. From now on it is the standard way to specify multi-table datasets and the others are deprecated. See the documentation for more details.
  • New examples of use of sklearn in the script samples_sklearn.py. Available also in the documentation.
• core:
  • It now fully supports remote filesystems provided for which the extra dependencies are installed (it is still necessary to install Khiops remote filesystem plugins).
• Other:
  • Most methods that accept containers now additionally accept classes implementing their abstract interface (eg. collections.abc.Sequence, collections.abc.Mapping).
• Internals:
  • The default value of samples_dir of the PyKhiopsLocalRunner class can now be set via the environment variable KHIOPS_SAMPLES_DIR.
  • New classes Dataset and DatasetTable to sklearn.tables to handle sklearn table transformations for Khiops.

Changed

• General:
  • Improved documentation completeness and layout.
• sklearn
  • Estimators do not depend anymore on local files. This fixes many issues including those related to serialization.
  • KhiopsRegressor now warns when n_trees > 0.
• core
  • Functions deploy_coclustering and deploy_model_for_metrics are moved from core.api to core.helpers. The latter module will contain non-basic functionality, whereas core.api will contain only the official Khiops API.

Deprecated

• sklearn:
  • tuple and list multi-table input modes in estimators.
  • key parameter of estimators.
  • variables parameter of KhiopsCoclustering estimator.

Removed

• sklearn:
  • Breaking computation_dir parameter in sklearn estimators. Khiops output files can still be saved with the parameter output_dir.
• Other:
  • Breaking Support for Python 2: 10.0.4 was the last version to support it.

Fixed

• sklearn:
  • Data-race when using many estimators in parallel.
  • Bug in KhiopsCoclustering when the trained coclustering did not cluster the key variable.
  • Bug in KhiopsEncoder that happened because a bad handling of OS-dependent line separators.
• Other:
  • Bug with KHIOPS_HOME environment variable not properly being taken into account when initializing the runner.

10.0.4 - 2022-01-13

Added

• Class PyKhiopsDockerRunner in package pykhiops.extras allowing to run pyKhiops with a remote Khiops Docker image as backend.

Fixed

• Bug with PyKhiopsRunner's scenario_prologue failing to execute.
• Bug in pykhiops.sklearn estimators not taking into account the target variable as Used.
• Bug in CentOS not taking into account environment variables and failing to execute.

10.0.3 - 2021-11-22

Added

• extract_clusters core API function to extract a dimension's clusters into a file.
• deploy_predictor_for_metrics core API function to evaluate performance metrics with third-party.
• detect_data_table_format core API function to obtain (heuristically) the header_line and field_separator from a data file (requires Khiops >= 10.0.1) libraries.
• train_predictor and evaluate_predictor now accept a main_target_value parameter
• Various ease-of-access methods:
  • AnalysisResults: get_reports
  • EvaluationReport: get_snb_performance, get_snb_lift_curve and get_snb_rec_curve
  • PredictorPerformance: get_metric and get_metric_names
• New examples to samples.py.

Internals:

• Support for remote filesystems s3 and gcs in sklearn module (installation with extra dependencies required).
• New scenario module containing classes to write templatized-scenarios and that also handle character encoding (see Fixed below).
• Support for the new subTool key of Khiops JSON files.
• Command-line options for samples.py to specify which samples to run.

Changed

• str parameters of core API functions may now also be bytes and bytearray
• Changed all core module docstrings to the "NumPy" style.
• write and writeln methods of classes in the dictionary, analysis_results and coclustering_results now require a PyKhiopsOutputFile object as argument.
• Query methods such as get_dictionary from DictionaryDomain now raise KeyError instead of returning None if the query fails.
• Core API functions that use a field_separator parameter now accept the string "\t".
• KhiopsClassifier and KhiopsRegressor now warn of incorrect types of target variable.
• Internals:
  • PyKhiopsLocalRunner now calls directly the MODL executables instead of the Khiops launch scripts (only for Khiops >= 10.0.1).
  • Specific pair parameter is not handled anymore with a temporary file.
  • Improved temporary file services in PyKhiopsRunner.

Removed

• Field separator constructor parameter for estimator classes of sklearn

Fixed

• Dictionary files created with pyKhiops are now guaranteed to be free of character encoding errors unless the new JSON field khiops_encoding is non-existent or set to colliding_ansi_utf8 in which case a warning is emitted
• Khiops execution problems due to the character encoding of certain parameters
• Khiops error reporting problems due to to character encoding
• train_coclustering now returns the path of the JSON coclustering report (.khcj)
• get_dimensions not working at all in CoclusteringReport
• Some Python 2 incompatibilities in Linux

10.0.2 - 2021-06-28

Added

• get_samples_dir core API function (works only with a local runner).
• train_predictor, evaluate_model, train_recoder, train_coclustering and deploy_coclustering now have return values (paths of relevant output files).

Changed

• transfer_database core API function renamed to deploy_model.
• build_transferred_dictionary core API function renamed to build_deployed_dictionary.
• In general the "model deployment" concept replaces that of "database transfer" in all code and in particular in the samples scripts.
• It is not necessary to specify a relative path as ./path for the results_dir argument.
• Messages enabled with the trace parameter go again to stdout.

10.0.1 - 2021-06-24

Added

• sklearn sub-module updated for pyKhiops 10.
• sklearn samples notebooks.
• deploy_coclustering core API function.
• build_multitable_dictionary core API function.

Changed

• The information messages of sklearn are now deactivated by default (they can be reactivated manually).

Removed

• sklearn dependency on overrides package.

Fixed

• Small transformation bug in convert-pk10.

10.0.0 - 2021-06-20

Added

• detect_format parameters to API methods that read databases. It is enabled by default and Khiops will try to automatically detect the format of input data tables. See the docstrings for the new behavior of header_line and field_separator.
• specific_pairs option replacing only_pairs_with. It allows the methods train_predictor and train_recoder more options to generate pairs of variables (only_pairs_with kept in legacy mode).
• PykhiopsRunner class to extend pyKhiops to different backends. PyKhiopsLocalRunner implements the current functionality and is the default runner.

Changed

• dictionary_domain parameter removed from all relevant API methods. Now methods accepting a dictionary file path as argument also accept a DictionaryDomain object.
• Renamed various parameters. Until the next major release pykhiops will warn when these old parameters are used.
• All optional parameters of API methods are now proper named parameters (no kwargs).
• All errors are now handled with custom PyKhiops* exceptions.
• Updated default values to those of Khiops 10. Notably max_trees == 10 by default.
• tools/convert-pk10.py script no longer exists. Now when installing pykhiops a convert-pk10 will be automatically be installed the user's local python scripts directory. Optionally, the function pykhiops.tools.convert_pk10 provides the same functionality.
• samples.py script is now in snake case and improved.
• Simplified samples.ipynb.
• Messages in trace mode now go to stderr.

Removed

• Naive Bayes classifier option from train_predictor.

Fixed

• simplify_coclustering: results_prefix now works.
• subprocess.Popen returning 1 in Linux even when the Khiops process ended correctly. This made the legacy mode detection fail.
• API functions failing when stderr was not empty even though the Khiops process ended correctly. Now it just emits a warning.

9.6.0b1- 2021-05-19

Added

• Compatibility for Khiops 10
• Legacy support for Khiops 9
• Partial compatibility for Khiops 10 JSON reports (no tree report)
• Script tools/convert_pk10.py to migrate from pyKhiops 9 to 10. See Changed below
• Extraction of dictionary data paths: See core.DictionaryDomain.extract_data_paths
• Robust JSON loading: tries utf-8 encoding, then the system's default.
• Licence file

Changed

• Now all variable/method names follow the PEP8 convention: All methods are now in snake_case

Removed

• In core.train_predictor: fill_test_database_settings and map (kept in legacy mode).

9.0.1 - 2020-09-30

Added

• Sources (first commit)