Fix flake warning.
Fix flake warning.

francisleunggie/openface,nhzandi/openface,nmabhi/Webface,xinfang/face-recognize,Alexx-G/openface,xinfang/face-recognize,francisleunggie/openface,Alexx-G/openface,xinfang/face-recognize,nmabhi/Webface,nmabhi/Webface,francisleunggie/openface,nhzandi/openface,cmusatyalab/openface,cmusatyalab/openface,cmusatyalab/openface,nmabhi/Webface,Alexx-G/openface,nhzandi/openface,Alexx-G/openface