AAAI Publications, Workshops at the Twenty-Sixth AAAI Conference on Artificial Intelligence

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Considering State in Plan Recognition with Lexicalized Grammars
Christopher Geib

Last modified: 2012-07-15


This paper documents extending the ELEXIR (Engine for LEXicalized Intent Recognition) system (Geib 2009; Geib 2011) with a world model. This is a significant increase in the expressiveness of the plan recognition system and allows a number of additions to the algorithm, most significantly conditioning probabilities for recognized plans on the state of the world during execution. Since, ELEXIR falls in the family of gramatical methods for plan recognition in viewing the problem of plan recognition as that of parsing, this paper will also briefly discuss how this extension relates to state of the art proposals in the natural language community regarding probabilistic parsing.


Plan Recognition; Activity Recognition; Lexicalized Grammars

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