
272 Natural Language Processing: Semantic Aspects
its repetition), strong (between two words connected by a WordNet
relation) and medium strong (between the words from two WordNet
synsets connected by paths longer than one). The LCs in (Barzilay
and Elhadad 1997) are built in every segment and then the chains
from different segments are merged if they contain a common word
with the same meaning. The chains are scored according to the
formula (Barzilay and Elhadad 1999):
Score(Chain) = Length(Chain) HomogenityIndex(Chain) (4)
where Length(Chain) is the number of occurrences of members of
the Chain, and HomogenityIndex(Chain) is
1 –
the number ...