Topic-based vector space model
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The topic-based vector space model (TVSM) extends the vector space model that way, [what way?] that term-vectors are not necessarily orthogonal any more. [Is this about epidemiology, in which vectors are disease-carrying germs, or about vectors in the mathematical sense?] In contrast to the generalized vector space model the topic-based vector space model does not depend on cooccurence-based similarities between terms.
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