[ML] Hyperparameter optimization logging

[valeriy42]

We have a hypothesis that line search for hyperparameter (coarse_parameter_tuning) phase is already doing such a good job, that the identified feasibility interval does not contain a solution that could improve the performance further (module random variation).

To investigate this hypothesis, we need to look at the logs of hyperparameter optimization path for some real-world scenarios.

• Is additional logging required?
• Can I run the jobs in the cloud myself and look at the logs?
• Summarize results in a google sheet.