Minor changes to pin
Minor changes to pin

Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk,Purdue-ACM-SIGAPP/SafeWalk