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Issue No.11 - November (2010 vol.22)
pp: 1637-1647
Elias Iosif , Technical University of Crete, Chania
Alexandros Potamianos , Technical University of Crete, Chania
ABSTRACT
In this work, Web-based metrics that compute the semantic similarity between words or terms are presented and compared with the state of the art. Starting from the fundamental assumption that similarity of context implies similarity of meaning, relevant Web documents are downloaded via a Web search engine and the contextual information of words of interest is compared (context-based similarity metrics). The proposed algorithms work automatically, do not require any human-annotated knowledge resources, e.g., ontologies, and can be generalized and applied to different languages. Context-based metrics are evaluated both on the Charles-Miller data set and on a medical term data set. It is shown that context-based similarity metrics significantly outperform co-occurrence-based metrics, in terms of correlation with human judgment, for both tasks. In addition, the proposed unsupervised context-based similarity computation algorithms are shown to be competitive with the state-of-the-art supervised semantic similarity algorithms that employ language-specific knowledge resources. Specifically, context-based metrics achieve correlation scores of up to 0.88 and 0.74 for the Charles-Miller and medical data sets, respectively. The effect of stop word filtering is also investigated for word and term similarity computation. Finally, the performance of context-based term similarity metrics is evaluated as a function of the number of Web documents used and for various feature weighting schemes.
INDEX TERMS
Natural language processing, semantic similarity, Web search, ontologies, knowledge acquisition.
CITATION
Elias Iosif, Alexandros Potamianos, "Unsupervised Semantic Similarity Computation between Terms Using Web Documents", IEEE Transactions on Knowledge & Data Engineering, vol.22, no. 11, pp. 1637-1647, November 2010, doi:10.1109/TKDE.2009.193
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