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I have tried to solve these issues. All the pre-existing tests work fine, but i did not create new ones since i have just refactored the same code. I have also change the signature of FaissKNN and CustomKNN: now they follow the same signature of faiss indexes. All the lines changed for this reason are marked by a comment.
Since now the knn_func argument of the FaissKNN class is a wrapper for CustomKNN objects, and CustomKNN contains the methods of the old MatchFinder class, it is unclear what to return if the user passes a knn_func that can not be used as a MatchFinder object (which now does not exist anymore as it was merged into the CustomKNN class). I chose to just raise a warning.