The proposed methods are evaluated in terms of relevance with respect to conversation fragments from the AMI, and ELEA conversational corpora, rated by several human judges. The proposed method to derive multiple topically separated queries from this keyword set, in order to maximize the chances of making at least one relevant recommendation when using these queries to search over the English Wikipedia. Therefore, it is difficult to infer precisely the information needs of the conversation participants. However, even a short fragment contains a variety of words, which are potentially related to several topics moreover, using an automatic speech recognition (ASR) system introduces errors among them. The keyword extraction from conversations, with the goal of using these keywords to retrieve, for each short conversation fragment, a small number of potentially relevant documents, which can be recommended to participants.
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