Cache split infromation for TPE sampler. #6128
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Motivation
This is a revival of #5464.
In the current implementation,
_split_cache
is unnecessarily repeated even when the results would be identical.This PR aims to eliminate such redundant computations and improve efficiency.
Description of the changes
The content is same as #5464 for now.
The cache uses
trial.number
as the key, and the value is the result of the split operation.