audeering/audb

`ModuleNotFoundError`/`KeyError` when trying to load a database from cache

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hagenw commented

I ran into both the ModuleNotFoundError and KeyError when trying to load a database that already had an existing version stored, and then found this PR.

I think it isn't a cross-platform issue, but a compatibility issue with different pandas versions.
I tried creating different versions of the db.pkl from the db.csv similar to what was added in d5402d6 , using always audb==1.7.2 but alternating the pandas version. Then I loaded the db.pkl with pd.read_pickle().

This replicated the error:

  • db.pkl created with pandas==2.0.3. Loading with pandas==2.2.2 leads to a ModuleNotFoundError
  • db.pkl created with pandas==2.2.1 or pandas==2.2.2. Loading with pandas==2.0.3 leads to a KeyError

Maybe the problem just manifested for Windows because it happened to install a different pandas version between tests, but for the other platforms the same pandas version was used.

Originally posted by @audeerington in #413 (comment)