Visualize the parameter distributions of the top X% trials with density estimators

[nabenabe0928]

Feature Request

Please write your suggestion here.

The concept by itself is the following:

I would like to have density estimators of each parameter with a slider so that I can see the distributions of each parameter in top X% or lower than a threshold.

If we talk about density estimators, we can also visualize the specific solutions in the Pareto front plot and I think it is very helpful because we cannot imagine where we have good parameters for Pareto solutions.