Function reservoir_sampling::weighted::a_res

pub fn a_res<I, T>(stream: I, sample_len: usize) -> Vec<T> where
    I: Iterator<Item = WeightedItem<T>>, 

An implementation of Algorithm A-Res (https://en.wikipedia.org/wiki/Reservoir_sampling#Algorithm_A-Res)

Parameters:

• Iterator of core::WeightedItem as source,
• sample_len, the size of the sampled reservoir. Returns a Vec of length sample_len In case iterator yields less than sample amount, sample will be filled as much as possible, and returned.