9. The method as recited in claim 8 , wherein computing a likelihood further includes, calculating the likelihood by multiplying the word probabilities for all the words in text instances generated by the sources times a length probability that the true title has the length of the candidate.
9. The method as recited in claim 8 , wherein computing a likelihood further includes, calculating the likelihood by multiplying the word probabilities for all the words in text instances generated by the sources times a length probability that the true title has the length of the candidate. 10. The method as recited in claim 9 , wherein evaluating generation parameters further includes, obtaining a training set of webpages, context webpages, and the corresponding true link titles, and maximizing the likelihood for the training set to obtain α s and β s .