2.1 Language Model
mation in modeling the translation of phrases as a
The unigram language model has been widely used
whole. More precise translation can be determined
for question retrieval on community-based Q&A
for phrases than for words. It is thus reasonable to
expect that using such phrase translation probabili-
data (Jeon et al., 2005; Xue et al., 2008; Cao et al.,
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