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This PR - fixes the `similarity_search_by_vector` example, makes the code run and adds the example to mirror `similarity_search` - reverts back to chroma from faiss to remove sharp edges / create a happy path for new developers. (1) real metadata filtering, (2) expected functionality like `update`, `delete`, etc to serve beyond the most trivial use cases @hwchase17 --------- Co-authored-by: Bagatur <baskaryan@gmail.com>