Fix flake8 warnings.
Fix flake8 warnings.

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