Model: Use opt.imgDim for retraining
Model: Use opt.imgDim for retraining

\cc @melgor

Ideally I should have made imgDim part of the model.
This works for now, but users training will need to be
careful about this size.

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