Could not obtain meaningful lengthscales

[rdiaz02]

Thanks a lot for the package. I am using it to optimize xgboost hyperparameters and, in some runs, I am getting Could not obtain meaningful lengthscales. I see where that is happening in the code (https://github.com/AnotherSamWilson/ParBayesianOptimization/blob/af44dd96f9c0fa1bde3ae9bf3fa53d735bac119f/R/updateGP.R#L88) but I do not have any intuition of what, if anything, I should/can do.

As far as I can tell, the optimization continues and the optimized model is, anyway, better than what I started from.