Question

我想弄清楚以下问题：我有两个节点:Merchant和:Customer。这两者与:BUY关系有关。我试图找到具有相同:Merchant个节点的:Customer个节点，甚至更好，这些节点分享90％的:Customer个节点。谢谢。

Answer 1

这对我有帮助： https://neo4j.com/docs/graph-algorithms/current/algorithms/similarity-jaccard/

所有要比较的节点都在同一图中并已连接很重要。

MATCH (p:Person)-[:LIKES]->(cuisine)
WITH {item:id(p), categories: collect(id(cuisine))} as userData
WITH collect(userData) as data
CALL algo.similarity.jaccard.stream(data)
YIELD item1, item2, count1, count2, intersection, similarity
RETURN algo.getNodeById(item1).name AS from, algo.getNodeById(item2).name AS to, intersection, similarity
ORDER BY similarity DESC

应该是这样，（取决于您的数据库）

MATCH (p:Merchant)-[:BUY]->(consumer)
WITH {item:id(p), categories: collect(id(consumer))} as userData
WITH collect(userData) as data
CALL algo.similarity.jaccard.stream(data)
YIELD item1, item2, count1, count2, intersection, similarity
WHERE similarity > 0.9
RETURN algo.getNodeById(item1).name AS from, algo.getNodeById(item2).name AS to, intersection, similarity
ORDER BY similarity DESC

据我了解，它使用jaccard（https://en.wikipedia.org/wiki/Jaccard_index）作为节点的ID。

PS：安装插件以使用它很重要： https://neo4j.com/docs/graph-algorithms/current/introduction/#_installation

neo4j找到具有类似连接的节点

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