21. The non-transitory computer-readable media of claim 20 , wherein adjusting the confidence scoring functionality includes updating the confidence score thresholds.
21. The non-transitory computer-readable media of claim 20 , wherein adjusting the confidence scoring functionality includes updating the confidence score thresholds. 23. The non-transitory computer-readable media of claim 21 , wherein the confidence score thresholds on the new ROC curve are determined based on accepting and rejecting an equal percentage of input utterances as the confidence score thresholds on the original ROC curve.