Hey @stephano41, ah I don’t think we have something like this for Ray Tune.
The optuna study is saved as a private attribute in the OptunaSearcher, so a hacky way to do this would be to pass in optuna_search._ot_study into get_param_importances.
But let me create a Github issue to track this feature. [Tune] Support for Optuna `get_param_importances` or equivalent · Issue #25522 · ray-project/ray · GitHub.