Optimization visualization

[hbredin]

Would be nice to add support for parallel axes plot:
https://twitter.com/bokeh/status/1233782933477109760

[hbredin]

Looks like this is already implemented in Optuna (along with other visualization techniques)
https://optuna.readthedocs.io/en/stable/reference/visualization.html

[hbredin]

https://github.com/optuna/optuna-dashboard