class FaissIndex(BaseIndex):
    """
    Dense index using Faiss. It is used to index vectors.
    Faiss is a library for efficient similarity search and clustering of dense vectors.
    It contains algorithms that search in sets of vectors of any size, up to ones that possibly do not fit in RAM.
    You can find more information about Faiss here:
    - For index types and the string factory: https://github.com/facebookresearch/faiss/wiki/The-index-factory
    - For GPU settings: https://github.com/facebookresearch/faiss/wiki/Faiss-on-the-GPU
    """