Invalid configuration result about hpbandster

[sfalkner]

You understood that correctly: If a configuration crashes in the worker, it will count as failed evaluation. The optimizer will go ahead and count this as an evaluation with an infinite loss and sample a new configuration. If many of your configurations fail like that it's hard to predict how many configurations are successfully evaluated. But without knowing any more details, I can't say anything specific.

If you set min_budget equal to max_budget, you do fall back to BO, but full disclaimer: the implementation in hpbandster is not quite as good as the original TPE implementation.