Function adaptive_spike_distance 

pub fn adaptive_spike_distance(
    times_a: &[f64],
    times_b: &[f64],
    t_start: f64,
    t_end: f64,
    cost: f64,
) -> f64

Adaptive SPIKE-distance (Kreuz et al. 2013). cost=0: pure SPIKE-distance. cost=1: ISI-like weighting.