Add IDLE message to optimizer to allow idle executors #49
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moritzmeister
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@ssheikholeslami is there any case where we will need this for ablation too? |
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The immediate thing that comes to my mind is the option it gives us for synchronous execution - and we want to use this for evaluating how the asynchrony reduces total time of the study. |
tabularaza27
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ssheikholeslami
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moritzmeister
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(cherry picked from commit 17d6816)
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For some optimization algorithms it is required to let an executor be idle for a short while until another trial finishes. This is the case in HyperBand when all Iterations are running but nothing can be promoted to next rung.
This PR makes a change to the Optimizer API and allows developers to return
"IDLE"from aget_suggestion()call. This will keep the executor idle until the optimizer returns a Trial again to be scheduled.Tested with both example notebooks.