Function f1_score 

pub fn f1_score(
    y_true: PyReadonlyArray1<'_, i32>,
    y_pred: PyReadonlyArray1<'_, i32>,
    labels: Option<PyReadonlyArray1<'_, i32>>,
    pos_label: i32,
    average: &str,
    sample_weight: Option<PyReadonlyArray1<'_, f64>>,
    zero_division: &str,
) -> PyResult<f64>

Calculate F1 score for binary classification