Revisiting the Prepositional-Phrase Attachment Problem Using Explicit Commonsense Knowledge
This addresses a specific NLP parsing challenge, offering incremental improvements with enhanced interpretability for developers and users.
The paper tackled the prepositional-phrase attachment ambiguity problem by proposing a module that uses explicit commonsense knowledge bases to improve attachment decisions, integrating rule-based and statistical techniques for better explainability.
We revisit the challenging problem of resolving prepositional-phrase (PP) attachment ambiguity. To date, proposed solutions are either rule-based, where explicit grammar rules direct how to resolve ambiguities; or statistical, where the decision is learned from a corpus of labeled examples. We argue that explicit commonsense knowledge bases can provide an essential ingredient for making good attachment decisions. We implemented a module, named Patch-Comm, that can be used by a variety of conventional parsers, to make attachment decisions. Where the commonsense KB does not provide direct answers, we fall back on a more general system that infers "out-of-knowledge-base" assertions in a manner similar to the way some NLP systems handle out-of-vocabulary words. Our results suggest that the commonsense knowledge-based approach can provide the best of both worlds, integrating rule-based and statistical techniques. As the field is increasingly coming to recognize the importance of explainability in AI, a commonsense approach can enable NLP developers to better understand the behavior of systems, and facilitate natural dialogues with end users.