Automatic Detection of Japanese Compound Functional Expressions and its Application to Statistical Dependency Analysis • Japanese has many compound functional expressions. • One words include both content words and functional words. • e.g. Ø“にあたって” and “をめぐって”
Ambiguity • One compound expression have both ØA literal content word usage u私は、彼の車について走った。 uI drove following his car. ØA non-literal functional usage u私は、自分の夢について話した。 uI talked about my dream. • To identify compound functional expression is important for some NLP tasks. • They use SVM for identifying expressions.
Approach • They formalize the task as a chunking problem. Ø“に あたっ て”→”にあたって” • After chunking, results are used for dependency analysis.
Results • F93%, to identify functional expression • Proposed dependency analysis with chunking significantly outperform exiting tools.