2 INFORMATION NEED PREDICTIONNEED A MODEL TO PREDICT THE INFORMATION...
4.2 Information Need Prediction
need a model to predict the information need part
based on the query question in order to recommend
After estimating the statistical translation probabili-
questions based on the similarity of their informa-
ties, we treat the information need prediction as the
tion needs. Another reason is that information need
process of ranking words by p(w|Q), the probability
prediction plays a crucial part not only in Question
of generating word w from question Q:
Answering but also in information retrieval (Liu et
P
tr
(w|t)P(t|Q) + (1 − λ)P (w|C)
P (w|Q) = λ X
al., 2008). In this paper we propose an information
t∈Q
need prediction method based on a statistical ma-
chine translation model.
The word-to-word translation probability
P
tr