(1) [ Quarterly revenue rose 4.5%, to $2.3 billion from $2.2 billion] arg1 [ For the year, net income tumbled 61% to $86 million, or $1.55 a share] arg2 Automatically classifying implicit relations is difficult in large part because it relies on numerous factors, ranging from syntax, and tense and aspect, to lexical semantics and even world knowledge (Asher and Lascarides, 2003).
a lot of previous work on this problem have attempted to incorporate some of these information into their systems.