adds tracking and logging best metrics to wandb cb #3372
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As per my understanding currently one can use only the last logged metric in W&B in some scenarios (e.g. comparing runs in sweep, reporting scores with barplot etc.) which might be inconvenient when best score is different from final score. This PR adds logging
best_metrics
dict, which contain the best observed scores during the run.best_metrics
contains an entry for each logged metric namedbest_{metric_name}
. Thecompare
argument is added to__init__
to allow user to provide custom list of comparison functions as it's not trivial to automate determining appropriate functions for all possible scenarios, I aimed made it consistent withTrackerCallback
in this regard.cc @morganmcg1 @borisdayma