Catalyst callback to prune unpromising trials.
This class is an alias to Catalyst’s OptunaPruningCallback.
See the Catalyst’s documentation for the detailed description.
Deprecated in v2.7.0. This feature will be removed in the future. The removal of this feature is currently scheduled for v4.0.0, but this schedule is subject to change. See https://github.com/optuna/optuna/releases/tag/v2.7.0.