Function predict_one_class_probability 

pub fn predict_one_class_probability(
    prob_density_marks: &[f64],
    dec_value: f64,
) -> f64

Predict probability for one-class SVM from density marks.

Bin-lookup in precomputed density marks (10 entries). Returns a probability estimate in (0, 1).

Matches LIBSVM’s predict_one_class_probability.