<!-- Please write a clear and concise description of the feature proposal. --> ## Motivation Several Optuna example scripts have pruning option `--pruning`, more concretely, ```bash python pytorch_lightning_simple.py --pruning ``` as in [this example](https://github.com/optuna/optuna-examples/blob/6a6b20ad634627eebb3e7e104f73b70b45c6e624/pytorch/pytorch_lightning_simple.py). But currently CIs have not performed with such pruning option. <!-- Please write the motivation for the proposal. If your feature request is related to a problem, please describe a clear and concise description of what the problem is. --> ## Description I'm wondering if we could decide the policy whether or not to use the pruning option in CIs: 1. Without pruning only (as in the current example's CIs) 1. With pruning only 1. Both <!-- Please write a detailed description of the new feature. --> ## Alternatives (optional) <!-- Please write a clear and concise description of any alternative solutions or features you've considered. --> ## Additional context (optional) - https://github.com/optuna/optuna-examples/pull/43#discussion_r777805569 <!-- Please add any other context or screenshots about the feature request here. -->