[ENH]: Add XGBoost and XGBoost with CV Early Stopping

[fraimondo]

This PR adds XGBoost as well as a custom XGBoost which uses CV and early stopping to determine the amount of trees to use.

[codecov]

Codecov Report

❌ Patch coverage is 94.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.17%. Comparing base (5501ac2) to head (5639bcc).

Files with missing lines	Patch %	Lines
julearn/models/available_models.py	42.85%	3 Missing and 1 partial ⚠️
julearn/models/xgb_cvearlystopping.py	97.84%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #306      +/-   ##
==========================================
+ Coverage   89.00%   89.17%   +0.16%     
==========================================
  Files          58       59       +1     
  Lines        2847     2947     +100     
  Branches      507      521      +14     
==========================================
+ Hits         2534     2628      +94     
- Misses        210      214       +4     
- Partials      103      105       +2     

Flag	Coverage Δ
docs	100.00% <ø> (ø)
julearn	89.17% <94.00%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
docs/conf.py	100.00% <ø> (ø)
julearn/models/xgb_cvearlystopping.py	97.84% <97.84%> (ø)
julearn/models/available_models.py	91.48% <42.85%> (-8.52%)	⬇️

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[Copilot]

Pull request overview

This PR introduces XGBoost-based models to julearn, including a custom wrapper that uses a holdout split (optionally group-aware) to determine n_estimators via early stopping, and registers these models for pipeline use. It also broadens scope with logging optimizations (delayed formatting + reduced feature logging), joblib-htcondor backend context propagation, documentation updates, and CI/workflow action version bumps.

Changes:

• Add xgboost dependency and register xgb / xgb_cvearlystopping models (plus new tests).
• Add DelayedFmtMessage and refactor many logs to be lazily formatted; add max_x_logs to limit verbose feature logging.
• Add joblib-htcondor backend context propagation for config/logging/sklearn settings; update docs and GitHub Actions.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
uv.lock	Locks new dependency graph including xgboost (and platform-specific wheels).
pyproject.toml	Adds xgboost to core dependencies.
julearn/utils/logging.py	Introduces DelayedFmtMessage for delayed log formatting.
julearn/transformers/target/ju_generated_target_model.py	Switches debug logs to delayed formatting.
julearn/transformers/target/available_target_transformers.py	Switches info log to delayed formatting.
julearn/transformers/dataframe/set_column_types.py	Switches debug logs to delayed formatting.
julearn/transformers/dataframe/pick_columns.py	Switches debug log to delayed formatting.
julearn/transformers/dataframe/drop_columns.py	Switches debug log to delayed formatting.
julearn/transformers/available_transformers.py	Switches info log to delayed formatting.
julearn/scoring/available_scorers.py	Switches logs to delayed formatting; refactors scoring debug message.
julearn/prepare.py	Limits feature logging via new max_x_logs; switches logs to delayed formatting.
julearn/pipeline/pipeline_creator.py	Switches many info/debug logs to delayed formatting.
julearn/models/xgb_cvearlystopping.py	Adds XGBoost CV/early-stopping wrapper estimators.
julearn/models/tests/test_xgb_cvearlystopping.py	Adds tests for grouped/non-grouped fitting behavior.
julearn/models/available_models.py	Registers xgb and xgb_cvearlystopping models.
julearn/model_selection/available_searchers.py	Refactors logging to delayed formatting.
julearn/model_selection/_skopt_searcher.py	Refactors logging to delayed formatting.
julearn/model_selection/_optuna_searcher.py	Refactors logging to delayed formatting.
julearn/config.py	Adds max_x_logs; adds joblib-htcondor context function helper; delayed formatting in config logging.
julearn/api.py	Adds joblib backend detection/configuration hook; delayed formatting in logs.
docs/configuration.rst	Documents config defaults and adds max_x_logs.
docs/changes/newsfragments/303.feature	Adds release note fragment for joblib-htcondor context propagation.
docs/changes/newsfragments/301.misc	Adds release note fragment for delayed log formatting.
docs/available_pipeline_steps.rst	Documents the new xgb pipeline step.
.github/workflows/publish.yml	Bumps softprops/action-gh-release major version.
.github/workflows/ci.yml	Bumps codecov/codecov-action major version.
.github/workflows/ci-docs.yml	Bumps codecov/codecov-action major version for docs CI.

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[github-actions]

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2026-06-02 08:28 UTC