1.ClusteringCoefficientAlgo参数为local时计算结果没有保留小数，所以总为0或1

[Yitozu]

2.DFS算法中的全局变量使用完为重置为0，导致多次执行DFS后itemNum的值总是大于maxIter以致于DFS算法没有结果

What type of PR is this?

• [√ ] bug
• [ ] feature
• [ ] enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

1.ClusteringCoefficientAlgo参数为local时计算结果没有保留小数，所以总为0或1 2.DFS算法中的全局变量使用完为重置为0，导致多次执行DFS后itemNum的值总是大于maxIter以致于DFS算法没有结果

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

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