Investigating Clarification Strategies in a Hybrid POMDP Dialog Manager
Sebastian Varges, Silvia Quarteroni, Giuseppe Riccardi, А. В. Иванов · Institutional Research Information System (Università degli Studi di Trento) · 2010
We investigate the clarification strategies exhibited by a hybrid POMDP dialog manager based on data obtained from a phone-based user study. The dialog man-ager combines task structures with a num-ber of POMDP policies each optimized for obtaining an individual concept. We in-vestigate the relationship between dialog length and task completion. In order to measure the effectiveness of the clarifica-tion strategies, we compute concept pre-cisions for two different mentions of the concept in the dialog: first mentions and final values after clarifications and simi-lar strategies, and compare this to a rule-based system on the same task. We ob-serve an improvement in concept precision of 12.1 % for the hybrid POMDP com-pared to 5.2 % for the rule-based system. 1