Automatic Conversation Driven by Uncertainty Reduction and Combination of Evidence for Recommendation Agents

Complex Systems Modeling
Modeling, Algorithms, and Informatics Group (CCS-3)
Los Alamos National Laboratory, MS B256
Los Alamos, New Mexico 87545, USA

Citation: Rocha, L.M. [2003]. "Automatic Conversation Driven by Uncertainty Reduction and Combination of Evidence for Recommendation Agents ". In: Systematic Organization of Information in Fuzzy Systems. NATO Science Series. P. Melo-Pinto, H.N. Teodorescu and T. Fukuda (Eds.) IOS Press, pp 249-265.

The full paper is available in Adobe Acrobat (.pdf) format only. Due to mathematical notation and graphics, only the abstract is presented here.


We present an adaptive recommendation system named TalkMine, which is based on the combination of Evidence from different sources. It establishes a mechanism for automated conversation between recommendation agents, in order to gather the interests of individual users of web sites and digital libraries. This conversation process is enabled by measuring the uncertainty content of knowledge structures used to store evidence from different sources. TalkMine also leads different databases or websites to learn new and adapt existing keywords to the categories recognized by its communities of users. TalkMine s currently being implemented for the research library of the Los Alamos National Laboratory under the Active Recommendation Project

The process of identification of the interests of users relies on a process of combining several fuzzy sets into evidence sets, which models an ambiguous “and/or” linguistic expression. The interest of users is further fine-tuned by a human-machine conversation algorithm used for uncertainty reduction. Documents are retrieved according to the inferred user interests. Finally, the retrieval behavior of all users of the system is employed to adapt the knowledge bases of queried information resources. This adaptation allows information resources to respond well to the evolving expectations of users.


Recommendation Systems, Information Retrieval, Web-related technologies, Fuzzy Set Theory, Evidence Sets, Measures of Uncertainty, Collaborative Systems, Adaptive Systems, Distributed Artificial Intelligence, Human-machine Interaction, Communities of Agents, Knowledge Representation, Soft Computing.

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For more information contact Luis Rocha at
Last Modified: September 02, 2004