[Tutorial 6] Use in memory sqlite to allow re-running the tutorial #55
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Problem
Currently, re-running Tutorial 6 several times might make FAISS complain about the fact that the content of its SQLite instance is still populated by leftover metadata from the previous execution. A contributor reported it happening on Colab.
https://discord.com/channels/993534733298450452/1033011959819423834/1035572050175213608
Solution
Specify that FAISS should use an in-memory version of SQLite, so that it will get erased with the FAISS backend when cells are re-run