Class VectorSearchIndex (0.8.0) 

VectorSearchIndex(
    num_leaves: int,
    num_branches: int,
    tree_depth: int,
    distance_type: langchain_google_spanner.vector_store.DistanceStrategy,
    nullable_column: bool = False,
    *args,
    **kwargs
)

The index for use with Approximate Nearest Neighbor (ANN) vector search.