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@article{frontiers22reuth,
    author = {Reuth Mirsky and Ran Galun and Kobi Gal and Gal A. Kaminka},
    title = {Comparing Plan Recognition Algorithms through Standard Plan Libraries},
    journal = {Frontiers in Artificial Intelligence},
    volume = {4},
    year = {2022},
    abstract = {
      Plan recognition deals with reasoning about the goals and execution process of an actor, given observations of its actions. It is one of the
      fundamental problems of AI, applicable to many domains, from user interfaces to cyber-security. Despite the prevalence of these approaches, 
      they lack a standard representation, and have not been compared using a common testbed. This paper provides a first step towards bridging 
      this gap by providing a standard plan library representation that can be used by heirarchical, discrete-space plan recognition and 
      evaluation criteria to consider when comparing plan recognition algorithms. This representation is comprehensive enough to describe a 
      variety of known plan recognition problems and can be easily used by existing algorithms in this class. 
      We use this common representation to thoroughly compare two known approaches, represented by two algorithms, SBR and Probabilistic Hostile 
      Agent Task Tracker (PHATT). We provide meaningful insights about the differences and abilities of these algorithms, and evaluate these 
      insights both theoretically and empirically. We show a tradeoff between expressiveness and efficiency: SBR is usually superior to PHATT in 
      terms of computation time and space, but at the expense of functionality and representational compactness. We also show how different 
      properties of the plan library affect the complexity of the recognition process, regardless of the concrete algorithm used. Lastly, we 
      show how these insights can be used to form a new algorithm that outperforms existing approaches both in terms of expressiveness and 
      efficiency.
    },
  URL={https://www.frontiersin.org/article/10.3389/frai.2021.732177},       
  DOI={10.3389/frai.2021.732177},      
  ISSN={2624-8212},   
}