fix max edge per vertex

[nevermore3]

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• bug
• feature
• enhancement

What problem(s) does this PR solve?

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• Unit test(positive and negative cases)
• Function test
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• Documentation affected (Please add the label if documentation needs to be modified.)
• Incompatibility (If it breaks the compatibility, please describe it and add the label.）
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• Performance impacted: Consumes more CPU/Memory

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ex. Fixed the bug .....