Defining reject_threshold for reject prediction.

[rhythmize]

After successfully training both UBM model and user specific GMM models. The difference between the ubm_score and the maximum gmm_score shows large variance for both trained and untrained users, so I'm not able to define reject_threshold for the system.
Is there a way to resolve this?

P.S. : Is this the reason you updated UBM_MODEL_FILE to None in 'src/gui/interface.py'?