Function py_predict_xor_ema 

pub(crate) fn py_predict_xor_ema(
    _py: Python<'_>,
    spikes: PyReadonlyArray1<'_, i8>,
    n_channels: usize,
    alpha: f64,
    threshold: f64,
) -> PyResult<(Py<PyArray1<i8>>, usize)>