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Jacana word aligner

Slides accompanying the article are located at http://cs.jhu.edu/~xuchen/paper/yao-jacana-wordalign-acl2013.ppt

1/ Describe parameters of feature function in section 3.1. Is there something unclear in the formula?

2/ Section 3.1 describes a problem with unknown number of states.
For example, we have the following source sentence: “Linda is married to Charles.”
and target sentence: “Charles likes his new role as the husband.”
and tags: NOUN, VERB, ADJ, ADV, PRON, DET, ADP, NUM, CONJ, PRT
How many states will be used?

3/ Search WordNet (http://wordnetweb.princeton.edu/perl/webwn) for words “married” and “husband”. Which (non-zero) WordNet features will be triggered for these two words?

a/ using POS tagger
b/ without POS tagger

4/ Why do you think, the authors add Hamming distance (cost) into the first formula in Section 3.1. Can the normalization function Z work without it?


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