Báo cáo khoa học: "Using Grammatical Relations to Compare Parsers" pptx

... Using Grammatical Relations to Compare Parsers Judita Preiss* Computer Laboratory University of Cambridge Judita.PreissAcl.cam.ac.uk Abstract We use the grammatical re- lations ... usefulness of a grammatical relation (GR) evaluation method by using it to compare the performance of four full parsers and a GR finder based on a shallow parser. It is usually difficult to comp...

Ngày tải lên: 08/03/2014, 21:20

... 1078 Vancouver Computer 2002 1130 Victoria Phone 2001 818 Victoria Phone 2002 894 Victoria Computer 2001 968 Victoria Computer 2002 1024 Location Type Time Vancouver Victoria Phone Computer 845 1078 2001 2002 Figure ... presented here aims to address this problem. Our model provides an enabling foun- dation toward a linguistic approach by first shift- ing to a two-dimensional CFG framework...

Ngày tải lên: 08/03/2014, 02:21

... automatic method to create a thesaurus that is sensitive to the sentiment of words expressed in different domains. • We describe a method to use the created the- saurus to expand feature vectors ... vector d ∈ R N , where the value of the j-th element d j is set to the total number of occurrences of the unigram or bigram w j in the review d. To find the suitable candidates to exp...

Ngày tải lên: 20/02/2014, 04:20

... struc- ture. Because of this, less linguistic structure needs to be “built in” to an adaptor grammar compared to a comparable PCFG. For example, the adaptor gram- mars for syllable structure presented in ... them to be stipulated in the grammar. In the unigram syllable adaptor grammar shown in Figure 7, Consonant expands to any consonant and Vowel expands to any vowel. This gram-...

Ngày tải lên: 20/02/2014, 09:20

... iterate over nodes from top down 2 for each node X 3 try to insert NP* in X 4 try to insert 0 in X 5 try to insert WHNP 0 or WHADVP 0 in X 6 try to insert *U* in X 7 try to insert a VP ellipsis ... ellipsis site in X 8 try to insert S*T* or SBAR in X 9 try to insert trace of topicalized XP in X 10 try to insert trace of extraposition in X 11 for each node X 12 try...

Ngày tải lên: 20/02/2014, 16:20

... a more complex approach to evaluat- ing the performance of the system's ability to detect errors. Here, we need to look at both the 1. We use the term critique to represent an instance ... In order to coerce our system into accepting only the desired parse tree, we modified it to ac- cept only parses that satisfied bracketed forms. 6. The BSEC has the capability to...

Ngày tải lên: 20/02/2014, 21:20

... attributed to two main factors. Firstly, the mapping from Cast3LB tags to LFG grammat- ical functions is not one -to- one. For example three Cast3LB tags (CC, MOD and ET) are all mapped to LFG ADJUNCT. ... Cast3LB treebank make it non-trivial to apply the method of auto- matically mapping c-structures to f-structures used by Cahill et al. (2004), which assigns grammatical Tag Mean...

Ngày tải lên: 08/03/2014, 02:21

... hard and time-consuming task to hand-align bilingual data, the automation of this task receives a fair amount of attention. In this pa- per, we present an approach to improve the bilin- gual dictionary ... the Compet- itive Linking algorithm (Melamed, 1997) allows for only up to one link per word. However, this one -to- one/zero -to- one assumption is relaxed by redefining the notion of...

Ngày tải lên: 08/03/2014, 07:20

... history of natural language understanding work, semantic and pragmatic constraints are known to be indispensable and are recommended to be represented in some formal way and to be referred to ... A STOCHASTIC APPROACH TO SENTENCE PARSING Tetsunosuke FuJisaki Science Institute, IBM Japan, Ltd. No. 36 Kowa Building 5-19 Sanbancho,Chiyoda-ku Tokyo 102, Japan ABSTRACT ... by [...

Ngày tải lên: 08/03/2014, 18:20

... relations were therefore added to the list of relations we used. Various other less commonly- occuring relations were also observed. To allow for these other relations, a function was added to the ... Gagn ´ e’s set of taxonomic relations. This suggests that the taxonomy needs to be ex- tended by the addition of further relations. In addition to identifying the relations...

Ngày tải lên: 08/03/2014, 02:21