Demonstration of AT&T “Let´s Go”: A production-grade statistical spoken dialog system

This paper is a demonstration of the AT&T "Let\´s Go" bus timetable spoken dialog system. The system was entered in the 2010 Spoken Dialog Challenge, where the task is to provide bus timetable information for Pittsburgh, Pennsylvania. Its primary aim was to build a statistical spoken dialog system to comemrcial production standards, both in terms of user interface, and also in terms of compatibility with commercial development practices. AT&T Let\´s Go illustrates how this can be done, incorporating two statistical techniques: the AT&T Statistical Dialog Toolkit (ASDT), which tracks a distribution over many dialog states in real time; and regression-based confidence scores, which are trained on a corpus of in-domain recognitions.