Function faiss_sys::faiss_IndexIVF_make_direct_map

pub unsafe extern "C" fn faiss_IndexIVF_make_direct_map(
    index: *mut FaissIndexIVF, 
    new_maintain_direct_map: c_int
) -> c_int

intialize a direct map

@param new_maintain_direct_map if true, create a direct map, else clear it