1998). Knowledge-based measures rely on lexical
tion which paraphrases her question, if available.
The question reformulations thus labelled by the
semantic resources such as WordNet and comprise
path length based measures (Rada et al., 1989)
users are stored in order to retrieve the same an-
swer when a given question reformulation is asked
and concept vector based measures (Qiu and Frei,
again.
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