Báo cáo khoa học: "Generalizing Dependency Features for Opinion Mining" pptx

... USA {maheshj,cprose}@cs.cmu.edu Abstract We explore how features based on syntac- tic dependency relations can be utilized to improve performance on opinion mining. Using a transformation of dependency re- lation triples, ... different features extracted from dependency parse trees to improve performance on the task of predicting the strength of opinion phrases. On the flip side,...

Ngày tải lên: 31/03/2014, 00:20

... different trans- formations have been studied by Johnson (1998), Klein and Manning (2003), and Bikel (2004). Corre- sponding manipulations in the form of tree transfor- mations for dependency- based ... treebanks, making the inverse trans- formation for PADT more problematic than for the other treebanks. The absence of a positive effect for PADT is therefore understandable given the...

Ngày tải lên: 17/03/2014, 04:20

... (Google n-grams) to compute features for the full parsing task. To show end-to-end effectiveness, we incor- porate our features into state-of-the-art dependency and constituent parsers. For the dependency case, we ... Second, we integrate our features into full-scale parsing systems. For dependency parsing, we augment the features in the second-order parser of McDonald and...

Ngày tải lên: 20/02/2014, 04:20

... the found set of features for text classification (index- ing) for an OIR query of the first level (finds opin- ionated information) and for an OIR query of the second level (finds opinionated information ... 37–42, Prague, June 2007. c 2007 Association for Computational Linguistics Kinds of Features for Chinese Opinionated Information Retrieval Taras Zagibalov Department of Inform...

Ngày tải lên: 20/02/2014, 12:20

... test examples. We use a number of features, including information-theoretic features previously used in unsupervised keyword extraction, as well as a novel set of features based on syntactic and ... properties of the text, or on informa- tion extracted from external knowledge repositories. 3.1 Phraseness and Informativeness We use the phraseness and informativeness features that we pre...

Ngày tải lên: 08/03/2014, 01:20

... primarily use it for evaluation pur- poses (not for training the readability models). 5 Linguistic Features and Readability We now describe the set of features we investi- gated for assessing ... Ostendorf, 2009) in the assessment of text reada- bility for English as a Second Language readers. While lexical features alone outperform syntactic features in classifying texts...

Ngày tải lên: 08/03/2014, 21:20

... extracting the DDN features re- quires knowledge of the object; therefore the per- formance of a model that only includes lexical features cannot be considered a fair baseline for studying the ... Contribution of Semantic Features The DDN features outperform the other two types of semantic features used separately and in conjunction. The difference in performance is sta- tis...

Ngày tải lên: 23/03/2014, 17:20

... adding features to the T&C08 model (see Table 3). We make three observations. First, while there is overlapping information between the dependency features and the phrase structure features, ... illustrate our features us- ing the example phrase many local groups around the country. Fig. 1 shows the phrase structure tree and dependency triples returned by the Stanford parser f...

Ngày tải lên: 30/03/2014, 21:20

... disturbing elements. As for morphol- ogy, verbs are expanded with all their tense forms (i.e. present, present continuous, past tense and past participle). Synonyms and morphological forms are added ... before, AltaVista was used as search engine. A baseline for the answer validation experiment was defined by considering how often an answer oc- curs in the top 10 documents among those (100...

Ngày tải lên: 08/03/2014, 07:20

... broadcast audio for information access. At LIMSI, broadcast news tran- scription systems have been developed for English, French, German, Mandarin and Portuguese, and systems for other languages ... in de- veloping a system for processing broadcast au- dio for information access. The system has two main components, the speech transcription com- ponent and the information retrieval c...

Ngày tải lên: 17/03/2014, 07:20