Function rbc_multi 

pub fn rbc_multi<I, L>(lists: &[L], persistence: f32) -> Vec<(I, f32)>
where
    I: Clone + Eq + Hash,
    L: AsRef<[(I, f32)]>,

RBC for 3+ result lists with custom persistence.

Arguments

• lists - Ranked lists to fuse
• persistence - Persistence parameter (0.0-1.0), default 0.8. Higher = more top-heavy.