func (a *Pattern) Distance(p lattice.Pattern) float64 {
b := p.(*Pattern)
i, err := a.Items.Intersect(b.Items)
exc.ThrowOnError(err)
inter := float64(i.Size())
return 1.0 - (inter / (float64(a.Items.Size()) + float64(b.Items.Size()) - inter))
}
func jaccardSetSimilarity(a, b types.Set) float64 {
i, err := a.Intersect(b)
exc.ThrowOnError(err)
inter := float64(i.Size())
return 1.0 - (inter / (float64(a.Size()) + float64(b.Size()) - inter))
}