A cross-medium neighbour is an evidenced graph edge, not a taste prediction.

Of 416 non-track objects, 113 currently have at least one neighbour in a different medium.

That ratio is registered as the covariate cross_medium_ratio. It is a candidate feature. It does not authorize a claim that visitors prefer crossings until first-party transition events exist in sufficient number.

Related first-party surfaces: Interact, Crossings collection.