Neo4j的找到类似的连接节点

Posted 2023-01-07

我想弄清楚以下问题：我有两个节点:Merchant和:Customer。这两者是有关系:BUY相关。我想找到具有相同:Merchant节点，甚至更好:Customer节点，这一比例让我们说90％的:Customernodes的。谢谢。

答案

这帮助了我：https://neo4j.com/docs/graph-algorithms/current/algorithms/similarity-jaccard/

重要的是，要比较的所有节点都在同一个图形和连接。

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

应该是这样的，（这取决于你的分贝）

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

按照我的理解它采用了捷卡（https://en.wikipedia.org/wiki/Jaccard_index）到节点的ID。

PS：它安装插件的使用是很重要的：https://neo4j.com/docs/graph-algorithms/current/introduction/#_installation