fix top_neighbors bug
fix top_neighbors bug

Impactstory/depsy,Impactstory/depsy,total-impact/software,Impactstory/depsy,total-impact/depsy,total-impact/depsy,total-impact/software,Impactstory/depsy,total-impact/depsy,total-impact/software,total-impact/software,total-impact/depsy