Reduction Factor in Ray tune

How do I use this parameter? When I run I do not get any halving at all at a setting of 2. My tuning works through the trials sequentially. I thought it would try and only carry forward the most promising combinations of hyper parameters.

Am I missing something, documentation seems thin on this setting IMHO

Thanks in advance,

Hey, I was facing this problem as well and still am not really sure what this param was supposed to be exactly due to the very limited docs.

This is what I found from ray tune faqs, hope it helps.

‘reduction_factor=4` means that only 25% of all trials are kept each time they are reduced.’

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It does thanks for that clarification!