Function confusion_matrix 

pub fn confusion_matrix(
    py: Python<'_>,
    y_true: PyReadonlyArray1<'_, i32>,
    y_pred: PyReadonlyArray1<'_, i32>,
    labels: Option<PyReadonlyArray1<'_, i32>>,
    sample_weight: Option<PyReadonlyArray1<'_, f64>>,
    normalize: Option<&str>,
) -> PyResult<Py<PyArray2<i64>>>

Calculate confusion matrix