Báo cáo khoa học: "Employing Topic Models for Pattern-based Semantic Class Discovery" doc

... document could be related to multiple topics in some topic models (e.g., pLSI and LDA). Topic modeling Semantic class construction word item (word or phrase) document RASC topic semantic ... organizing them into semantic classes. For example, {red, white, black…} is a semantic class consisting of color instances. A popular way for semantic class dis- cove...

Ngày tải lên: 08/03/2014, 00:20

... Association for Computational Linguistics Unsupervised Topic Modelling for Multi-Party Spoken Discourse Matthew Purver CSLI Stanford University Stanford, CA 94305, USA mpurver@stanford.edu Konrad ... drawing the topic assignment for each word, z u,i , conditioned on all other topic assign- ments, z −(u,i) , all topic change indicators, c, and all words, w; and then drawing the...

Ngày tải lên: 20/02/2014, 11:21

... 90% of the dialogs for training, and used the remainder for testing. We separately trained models for: user dia- log act classication (DAC, Equation 1); user task/subtask classication (STC, ... feature vector for user subtask classication has the same features as for user dialog act inter- pretation, plus the actual or classied dialog act (see Equation 2). The label for each...

Ngày tải lên: 22/02/2014, 02:20

... customized 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 ... task outperforms the other machine learning techniques investigated. In the monolingual task, the approach per- forms as well as the state-of-the-art sys- tems which reported results for...

Ngày tải lên: 08/03/2014, 02:21

... mapped into a vector space and SLU is performed as a classification problem using Maximal Margin Classifiers (Shawe-Taylor and Cristianini, 2004). Generative models have the advantage to be more robust ... months 1 Contract n. 33549 etc. The class of a word not belonging to any class is the word itself. In the second step, classes are mapped into con- cepts. The mapping is not one-to-one:...

Ngày tải lên: 08/03/2014, 21:20

... Meeting of the Association for Computational Linguistics, pages 856–864, Portland, Oregon, June 19-24, 2011. c 2011 Association for Computational Linguistics Rule Markov Models for Fast Tree-to-String ... performance of vertically composed rules at various settings. Here we have chosen the setting that gives the best performance on the test set for inclusion in Table 1. Table 6 sho...

Ngày tải lên: 17/03/2014, 00:20

... 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-speech, infor- ... can simplify the above formula and write: le+l 1 P(a,e,,f,)= ]-I p(ei,f~ilal )i-1 (5) i=1 where a~ -1 is a shorthand for (al, ,ai-1). p(ei, f~,) is a shorthand for p(a~(ei) = f~,...

Ngày tải lên: 17/03/2014, 07:20

... suitable for our task, by incorporating the new variable c for semantic orientation in the EM computation. 5 Conclusion We proposed models for phrases with semantic orientations as well as a classification ... computational models for phrases with semantic orientations as well as classification methods based on the models. Indeed the seman- tic orientations of phrases depend...

Ngày tải lên: 17/03/2014, 22:20

... model. The probabilities 1150 Sentence Doc3 ' Doc3 ' Doc3 ' Doc3 ' Doc3 ' _3 Doc3 Topic4 shallow Doc3 Topic4 circuits Doc3 Topic4 compute Doc3 Topic7 faster Figure 2: A tree generated ... Doc j,i  Topic i i, i  ∈ 1, . . . , ; j ∈ 1, . . . , m Topic i → w i ∈ 1, . . . , ; w ∈ V A sample parse generated by a “sticky topic 1151 Sentence Doc3...

Ngày tải lên: 23/03/2014, 16:20

... the Association for Computational Linguistics, pages 311–319, Jeju, Republic of Korea, 8-14 July 2012. c 2012 Association for Computational Linguistics Smaller Alignment Models for Better Translations: Unsupervised ... d, but the differences do not concern us here. All three models, as well as IBM Models 3–5, share the same t. For further details of these models, the reader is...

Ngày tải lên: 30/03/2014, 17:20