CUED Publications database

Statistical user simulation with a hidden agenda

Schatzmann, J and Thomson, B and Young, S (2007) Statistical user simulation with a hidden agenda. Proceedings of the 8th SIGdial Workshop on Discourse and Dialogue. pp. 273-282.

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Recent work in the area of probabilistic user simulation for training statistical dialogue managers has investigated a new agenda-based user model and presented preliminary experiments with a handcrafted model parameter set. Training the model on dialogue data is an important next step, but non-trivial since the user agenda states are not observable in data and the space of possible states and state transitions is intractably large. This paper presents a summary-space mapping which greatly reduces the number of state transitions and introduces a tree-based method for representing the space of possible agenda state sequences. Treating the user agenda as a hidden variable, the forward/backward algorithm can then be successfully applied to iteratively estimate the model parameters on dialogue data. © 2007 Association for Computational Linguistics.

Item Type: Article
Divisions: Div F > Machine Intelligence
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:29
Last Modified: 15 Feb 2018 01:15