TAILIEUCHUNG - Báo cáo khoa học: "Computing weakest readings"

We present an efficient algorithm for computing the weakest readings of semantically ambiguous sentences. A corpus-based evaluation with a large-scale grammar shows that our algorithm reduces over 80% of sentences to one or two readings, in negligible runtime, and thus makes it possible to work with semantic representations derived by deep large-scale grammars. | Computing weakest readings Alexander Koller Stefan Thater Cluster of Excellence Saarland University koller@ Dept. of Computational Linguistics Saarland University stth@ Abstract We present an efficient algorithm for computing the weakest readings of semantically ambiguous sentences. A corpus-based evaluation with a large-scale grammar shows that our algorithm reduces over 80 of sentences to one or two readings in negligible runtime and thus makes it possible to work with semantic representations derived by deep large-scale grammars. 1 Introduction Over the past few years there has been considerable progress in the ability of manually created large-scale grammars such as the English Resource Grammar ERG Copestake and Flickinger 2000 or the ParGram grammars Butt et al. 2002 to parse wide-coverage text and assign it deep semantic representations. While applications should benefit from these very precise semantic representations their usefulness is limited by the presence of semantic ambiguity On the Rondane Treebank Oepen et al. 2002 the ERG computes an average of several million semantic representations for each sentence even when the syntactic analysis is fixed. The problem of appropriately selecting one of them to work with would ideally be solved by statistical methods Higgins and Sadock 2003 or knowledge-based inferences. However no such approach has been worked out in sufficient detail to support the disambiguation of treebank sentences. As an alternative Bos 2008 proposes to compute the weakest reading of each sentence and then use it instead of the true reading of the sentence. This is based on the observation that the readings of a semantically ambiguous sentence are partially ordered with respect to logical entailment and the weakest readings - the minimal least informative readings with respect to this order - only express safe information that is common to all other read ings as well. However when a sentence has .

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.