Báo cáo khoa học: "Latent Variable Models for Semantic Orientations of Phrases" pdf

... type of phrase contains most of interesting properties of phrases, such as emergence or inversion of se- mantic orientations. In order to capture the properties of semantic orientations of phrases, ... latent variable models work well in the classifi- cation of semantic orientations of phrases and achieved nearly 82% classification ac- curacy. 1 Introduction Techno...

Ngày tải lên: 17/03/2014, 22:20

... data. Latent variable models that use E M for infer- ence can be very sensitive to the number of latent variables chosen. For example, the performance of ROOTH-EM worsens quickly if the number of clusters ... on semantic applications of topic models. Section 3 describes the models used in our exper- iments. Section 4 provides details of the experi- mental design. Secti...

Ngày tải lên: 07/03/2014, 22:20

... Proceedings of the 47th Annual Meeting of the ACL and the 4th IJCNLP of the AFNLP, pages 620–628, Suntec, Singapore, 2-7 August 2009. c 2009 ACL and AFNLP Latent Variable Models of Concept-Attribute ... The LDA-based models do not inherently make use of any ranking infor- mation contained in the original extractions. How- ever, such information can be incorporated in the form...

Ngày tải lên: 30/03/2014, 23:20

... information gained from the textual context of the candidate term. 2 Context information for terms The idea of incorporating context information for term extraction came from that "Extended ... examined string, lal the length of a in terms of number of words, f(a) the frequency of a in the corpus, Ta the set of candidate terms that contain a, P(T~) the number...

Ngày tải lên: 22/02/2014, 03:20

... These types of infor- mation provide rich clues for building dialog mod- els (Grosz and Sidner, 1986). Dialog models can be built of ine (for dialog mining and summariza- tion), or online (for dialog ... history Nbest F start!complete connection!paths shift!reduce Figure 5: Performance of parse-based methods for subtask tree building Figure 5 shows the performance of the differ...

Ngày tải lên: 22/02/2014, 02:20

... the above formula, nDCG(G i,j ) is the nDCG score of semantic class G i,j ; and k i denotes the number of semantic classes assigned to SSC i . For a list of queries, the MnDCG score of an algo- rithm ... perform preprocess- ing (refer to Section 3.4 for details) before build- ing topic models for C R (q), where some low- frequency items are removed. Determine the numb...

Ngày tải lên: 08/03/2014, 00:20

... for this monolingual task, the ILP approach signif- icantly outperforms the majority sense baseline and performs as well as the state -of- the-art system re- porting results for the same set of ... for the disambigua- tion of verbs. We plan to further evaluate our approach for other sets of words, including other parts -of- speech to allow further comparisons with other appr...

Ngày tải lên: 08/03/2014, 02:21

... Proceedings of the 12th Conference of the European Chapter of the ACL, pages 202–210, Athens, Greece, 30 March – 3 April 2009. c 2009 Association for Computational Linguistics Re-Ranking Models For ... representation based on semantic constituents. These are the units for meaning representation and are often re- ferred to as concepts. Concepts are instantiated by sequences o...

Ngày tải lên: 08/03/2014, 21:20

... can be formed out of smaller rules (includ- ing larger phrase pairs that can be formerd out of smaller phrase pairs), as opposed to minimal rules, which are rules that cannot be formed out of other rules. ... results of our paper. We used grammars of minimal rules and composed rules of maximum height 3 as our baselines. For decod- ing, we used a beam size of 50. Using the best...

Ngày tải lên: 17/03/2014, 00:20

... model of the possible alignments in the form of flow net- works. This representation allows to define dif- ferent kinds of alignments and to find the most probable or an approximation of this ... 1993), for example, allow to take this fact into account. We can envisage more complex models, in- cluding distortion parameters, multiword no- tions, or information on part -of- s...

Ngày tải lên: 17/03/2014, 07:20