Function batch_lif_run_multi 

pub(crate) fn batch_lif_run_multi<'py>(
    py: Python<'py>,
    n_neurons: usize,
    n_steps: usize,
    leak_k: i16,
    gain_k: i16,
    currents: PyReadonlyArray1<'py, i16>,
    data_width: u32,
    fraction: u32,
    v_rest: i16,
    v_reset: i16,
    v_threshold: i16,
    refractory_period: i32,
) -> PyResult<(Bound<'py, PyArray2<i32>>, Bound<'py, PyArray2<i16>>)>

Run N independent LIF neurons in parallel, each with its own constant input.

Returns (spikes: ndarray[i32, (n_neurons, n_steps)], voltages: ndarray[i16, (n_neurons, n_steps)]).