Function classification_report 

pub fn classification_report(
    predictions: &[usize],
    targets: &[usize],
    labels: &[&str],
) -> Result<String, EvalError>

Generate a human-readable classification report (similar to scikit-learn’s classification_report).

Example output:

              precision  recall  f1-score  support
         cat      0.800   0.889     0.842        9
         dog      0.857   0.750     0.800        8
    accuracy                        0.824       17