An aggregated relationship edge between two leaf topics: how many entity relationships cross
between their member entities. Undirected (one entry per pair) and pruned to each topic's
strongest neighbors, so weak long-tail links may be absent. Ids churn on rebuild, like
KnowledgeBaseGraphTopic.id.
An aggregated relationship edge between two leaf topics: how many entity relationships cross between their member entities. Undirected (one entry per pair) and pruned to each topic's strongest neighbors, so weak long-tail links may be absent. Ids churn on rebuild, like KnowledgeBaseGraphTopic.id.