Function conshomfold::remove_small_bpps_from_bpp_mat

pub fn remove_small_bpps_from_bpp_mat<T>(
    sparse_bpp_mat: &HashMap<(T, T), f32, BuildHasherDefault<FxHasher>>, 
    min_bpp: f32
) -> HashMap<(T, T), f32, BuildHasherDefault<FxHasher>> where
    T: Unsigned + PrimInt + Hash + FromPrimitive + Integer + Ord,