Báo cáo khoa học: "Weakly Supervised Approaches for Ontology Population" docx

... large scale applications. 3 Weakly supervised approaches for Ontology Population In this Section we present three Ontology Popula- tion approaches. Two of them are unsupervised: 18 (i) a pattern-based ... 2005). State-of-the-art approaches may be divided in two classes, according to different use of train- ing data: Unsupervised approaches (see (Cimi- ano et al., 2005) for de...

Ngày tải lên: 31/03/2014, 20:20

... directly. 2.2 Weakly Supervised Learning Recent years have witnessed a significant growth of research into weakly supervised ML techniques for NLP applications. Different approaches are of- ten ... hybrid co/self-training strategy for weakly supervised re- lation classification and (Chen et al., 2006) where a graph based algorithm called label propagation is employed to perform weak...

Ngày tải lên: 23/03/2014, 18:20

... Weakly Supervised Learning for Cross-document Person Name Disambiguation Supported by Information Extraction Cheng Niu, Wei Li, and Rohini K. ... name disambiguation calls for NLP/IE support which may have extracted the key person’s identification information from the textual documents. compared. Significant performance enhancement up ... probabilities in Eq. (3), for a given...

Ngày tải lên: 31/03/2014, 03:20

... (2008; 2009) recent work on unsupervised multilingual POS tagging, existing approaches to unsupervised POS tagging have been developed and tested primarily on English data. For instance, Merialdo (1994) ... Similar trends are observed for Lex- icon 2, where BHMM+IS outperforms BHMM and MLHMM by a larger margin of 5–10% and 12–16%, respectively. For Lexicon 3, BHMM+IS outperforms SHMM,...

Ngày tải lên: 24/03/2014, 03:20

... tasks such as information distillation and question answering. Most successful approaches to NER employ machine learning techniques, which require supervised training data. However, for many languages, ... time distributions for information extraction, in general, and NE extrac- tion, in particular, is not new. (Hetland, 2004) surveys recent methods for scoring time sequences for...

Ngày tải lên: 20/02/2014, 12:20

... basis for finding and further discriminating more detailed semantic relations. 3 A Weakly Supervised Approach to Learning Presupposition Relations We describe a weakly supervised approach for learning ... Setting Initial Subset of Verb Pair Candidates. Unlike other semi -supervised approaches, we don’t use patterns for acquiring new candidates for classi- fication. Candidate verb...

Ngày tải lên: 07/03/2014, 22:20

... (Davidov et al., 2007) are only evaluated for three hand-picked classes, with preci- sion scores of 90% for names of countries, 87% for fish species and 68% for instances of constellations. Our evaluation ... departure from previous approaches to large- scale information extraction from unstructured text on the Web, this paper introduces a weakly- supervised extraction framework f...

Ngày tải lên: 08/03/2014, 01:20

Ngày tải lên: 08/03/2014, 01:20

... of 53% for E s and 304% for E a . 4.2 Evaluation of Attributes Target Hierarchy Concepts: The performance of attribute extraction is assessed over a set of 25 tar- get concepts also used for evaluation ... Seed attributes are provided as input for only one target concept (top graphs), or for each target concept (bottom graphs) for failing to extract any attributes for some tar-...

Ngày tải lên: 08/03/2014, 21:20

... tags First letter of previous tag Word forms Current word form Previous word form Previous two word forms Following word form Following two word forms Last but one word form Current word affixes Prefixes ... dependencies to include the right-hand side disambiguated tags, 4 For brevity, we will use the terms supervised and “un- supervised data for “manually annotated” and “(automat- ically...

Ngày tải lên: 17/03/2014, 22:20