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The strength of
concept links between two sentences, sim(si,sj), is in turn
calculated as the weighted sum of the strength of each concept link in SL(si,sj).
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We use the data
available at http://elib.cs.berkeley.edu/docfreq to get the term document
frequency
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“Welcome to the Web
Term Document Frequency and Rank site! Available from this site are the document
frequency and rank of 31,928,892 terms found on 49,602,191 pages of the Web.”
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Sum of “strength” of concept links
