Fix flake warning.
Fix flake warning.

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