Function py_kl_refine 

pub(crate) fn py_kl_refine<'py>(
    py: Python<'py>,
    adj_offsets: PyReadonlyArray1<'_, i64>,
    adj_neighbours: PyReadonlyArray1<'_, i32>,
    adj_scc_abs: PyReadonlyArray1<'_, f64>,
    vertex_weights: PyReadonlyArray1<'_, f64>,
    part_map: PyReadonlyArray1<'_, i32>,
    parts_concat: PyReadonlyArray1<'_, i32>,
    parts_offsets: PyReadonlyArray1<'_, i64>,
    n_parts: i32,
    kl_iterations: i32,
    correlation_penalty: f64,
) -> PyResult<(Py<PyArray1<i32>>, u64)>