From 049263a36b74339ad98c30d9748c4be8e5ef17ff Mon Sep 17 00:00:00 2001
From: zhangyi51 <zhangyi51@baidu.com>
Date: Wed, 6 Jan 2021 11:27:26 +0800
Subject: [PATCH] fix jaccard similarity nan

Change-Id: I78a3f3da2be5480712f4545fbc93daad77f0bf1d
---
 .../hugegraph/traversal/algorithm/JaccardSimilarTraverser.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/algorithm/JaccardSimilarTraverser.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/algorithm/JaccardSimilarTraverser.java
index ba62b24df5..af9f321cb2 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/algorithm/JaccardSimilarTraverser.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/traversal/algorithm/JaccardSimilarTraverser.java
@@ -65,6 +65,9 @@ public double jaccardSimilarity(Id vertex, Id other, Directions dir,
     public double jaccardSimilarity(Set<Id> set1, Set<Id> set2) {
         int interNum = CollectionUtil.intersect(set1, set2).size();
         int unionNum = CollectionUtil.union(set1, set2).size();
+        if (unionNum == 0) {
+            return 0.0D;
+        }
         return (double) interNum / unionNum;
     }