Fix assert bound.
Fix assert bound.

\cc @aaronnech

For #132

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