Fix bad config ids that name cache directories #2686
Merged
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data_dir=Nonewas considered a dataset config parameter, hence creating a special config_id for all dataset being loaded.Since the config_id is used to name the cache directories, this leaded to datasets being regenerated for users.
I fixed this by ignoring the value of
data_dirwhen it'sNonewhen computing the config_id.I also added a test to make sure the cache directories are not unexpectedly renamed in the future.
Fix #2683