Fix pep8 warning.
Fix pep8 warning.

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