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The TREC Genomics 2007 task included recognizing topic-specific entities in the returned answer snippets. To tackle this problem, we designed and implemented a novel data-driven approach by combining information extraction with language modeling techniques. Instead of using an exhaustive list of all possible instances for an entity, we look at the language usage around each entity type and use that as a classifier by comparing it with the language models of the snippets. E.g., given the entity type "genes", our approach can measure the gene-iness of a piece of text. In the presentation we describe the underlying algorithm, which works as follows. Given a list of possible entity types, it first uses Hearst patterns to extract instances of each type. To extract more, we look for new syntactic patterns around the instances and use them as input for a bootstrapping method, in which new instances and patterns are discovered iteratively. Afterwards, all discovered instances and patterns are used to find the sentences in the collection which are most on par with the entity type. A language model is generated from these sentences by sampling i.i.d. Then, at retrieval time, we use the language model of the topic's entity type to rerank the found snippets.
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