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Pre-release
Pre-release

@hvy hvy released this Nov 7, 2019 · 144 commits to master since this release

This is the release note of v0.18.0. See here for the complete list of solved issues and merged PRs.

Upcoming Python 2 Support Drop

Due to the end-of-life (EOL) of Python 2 in January 2020, Optuna will drop Python 2 support in December 2019.

This decision was made considering the following facts:

We plan to drop Python 2 support in the first release in December 2019.

Compatibility

  • Remove OptunaConfig. (#653)
  • Catch no exceptions in optimize by default. (#638)

New Features

  • Add function for high-dimensional parameter relationships visualization. (#594, thanks @suecharo!)
  • Add function for parameter relationships visualization as slice plot. (#540, thanks @suecharo!)
  • Add function for parameter relationships visualization as contour plot. (#539, thanks @suecharo!)
  • Add a PyTorch Ignite handler for pruning. (#561)
  • Add PyTorch Lightning pruning integration. (#597)
  • Add FastAI Callback for pruning. (#585, thanks @crcrpar!)
  • Add public APIs for checking visualization availability. (#607)
  • [Experimental] Add a prototype version of automatic LightGBM tuner with stepwise logic. (#549)

Enhancements

  • Improve handling of reported values. (#659)
  • Avoid iterating through all trials unnecessarily. (#641, thanks @dwiel!)
  • Remove TrialModel.where_study_id. (#640)
  • Record all error raising trials as failures. (#637)
  • Speed up Parzen Estimator. (#554, thanks @oda!)
  • Cache best trial_id. (#535, thanks @oda!)
  • Add an option to force_garbage_collection for every trial. (#533, thanks @oda!)
  • Fix plot_optimization_history. (#631, thanks @cafeal!)

Bug Fixes

  • Add type casting to float. (#644)
  • Add missing call to check function. (#598)

Documents

  • Add PULL_REQUEST_TEMPLATE.md file. (#651)
  • Update issue template. (#652)
  • Update CONTRIBUTING.md file. (#649)
  • Update the experimental warning of OptunaSearchCV. (#639)
  • Update BaseStudy.trials doc to specify order constraint. (#634)
  • Add visualization functions to API reference doc. (#615)
  • Apply a small fix to the docstring of Study. (#591)
  • Add links to nbviewer. (#590, thanks @upura!)

Examples

  • Add a distributed optimization example on Kubernetes. (#643, thanks @AnesBenmerzoug!)
  • Add --pruning option to the PyTorch Ignite example. (#633)
  • Fix an example for tensorflow==1.15.0. (#620)
  • Add pruning to Chainer example. (#614, thanks @Crissman!)
  • Enclose plot_slice() of slice plot example in backquotes. (#608, thanks @crcrpar!)
  • Add PyTorch Lightning example. (#584)

Tests

  • Fix assertions in test_optimize_with_catch. (#650)
  • Fix the module of type variables. (#636)
  • Add ValueError test to test_get_contour_plot(). (#616, thanks @crcrpar!)

Continuous Integration

  • Skip XGBoost tests and examples with Python 2.7 in CircleCI. (#654)
  • Hide pip progress bar from CircleCI log. (#648)
  • Align CircleCI install-examples step name to anchor. (#618)

Code Fixes

  • Use indices to align with the others. (#621, thanks @crcrpar!)
  • Replace useless None check with assertion. (#610)
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