Function faiss_sys::faiss_IndexIVF_copy_subset_to

pub unsafe extern "C" fn faiss_IndexIVF_copy_subset_to(
    index: *const FaissIndexIVF, 
    other: *mut FaissIndexIVF, 
    subset_type: c_int, 
    a1: c_long, 
    a2: c_long
) -> c_int

copy a subset of the entries index to the other index

if subset_type == 0: copies ids in [a1, a2) if subset_type == 1: copies ids if id % a1 == a2 if subset_type == 2: copies inverted lists such that a1 elements are left before and a2 elements are after