Fix flake8 warnings.
Fix flake8 warnings.

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