Báo cáo khoa học: "Latent variable models of selectional preference" potx

... data.Latent variable models that use E M for infer-ence can be very sensitive to the number of latentvariables chosen. For example, the performance of ROOTH-EM worsens quickly if the number of clusters ... top-ical structure of documents can be adapted tolearn probabilistic models of selectional prefer ence.These models are especially effective for estimat-ing plausibility of low-frequency items, ... prior work on selectional preference mod-elling and on semantic applications of topic models. Section 3 describes the models used in our exper-iments. Section 4 provides details of the experi-mental...

Báo cáo khoa học: "Latent Variable Models of Concept-Attribute Attachment" pptx

... 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 AFNLPLatent Variable Models of Concept-Attribute ... between the top 10 concepts of C(w) and any of the gold-standard concepts, or ifC(w) is empty. The overalll precision of a givenmodel is the average of the DRR scores of individ-ual attributes, ... Conservation of entropy is a strongassumption, and in particular it hinders improvingthe speciﬁcity of attribute rankings.Class-Entropy+Prior: The LDA-based models do not inherently make use of any...

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 semanticorientations of phrases, ... into the models to capture the properties of phrases. Through experiments, we showed thatthe proposed latent variable models work wellin the classification of semantic orientations of phrases ... latent variable models work well in the classifi-cation of semantic orientations of phrasesand achieved nearly 82% classification ac-curacy.1 IntroductionTechnology for affect analysis of texts...

... states of each of the two models are unseen and must be inferred from the words. The problem of language understanding, then, is to recover the most likely meaning structure given a sequence of ... 92]. Hidden understanding models are capable of learning a variety of meaning representations, ranging from simple domain-specific representations, to ones at a level of detail and sophistication ... sequence of spectra, the relation between the meaning of a sentence and the sequence of words is not a simple linear sequential model. Language is inherently nested, with subgroups of concepts...

Báo cáo khoa học: "Evaluating Distributional Models of Semantics for Syntactically Invariant Inference" doc

... the selectional preferences of words. The vector representation of a word incontext depends on the inverse selectional prefer-ences of its dependents, and the selectional pref-erences of its ... PennDepartment of Computer ScienceUniversity of TorontoToronto, ON, M5S 3G4, Canada{jcheung,gpenn}@cs.toronto.eduAbstractA major focus of current work in distri-butional models of semantics ... Vector-based models of semantic composition. In Proceedings of ACL-08: HLT, pages 236–244.Jeff Mitchell and Mirella Lapata. 2009. Language models based on semantic composition. In Pro-ceedings of the...

Báo cáo khoa học: "Vector-based Models of Semantic Composition" ppt

... achieves.As a result of the assumption of symmetry, boththese models are ‘bag of words’ models and wordorder insensitive. Relaxing the assumption of sym-metry in the case of the simple additive ... function of the tensor product of u and v, then we obtain multi-plicative models: p = Cuv (4)where C is a tensor of rank 3, which projects thetensor product of u and v onto the space of p.Further ... poten-tial drawback of multiplicative models is the effect of components with value zero. Since the product of zero with any number is itself zero, the presence of zeroes in either of the vectors...

Báo cáo khoa học: "Cognitively Plausible Models of Human Language Processing" ppt

... developingcognitively plausible models of human languageprocessing. Developing computational models is of scientiﬁc importance in so far as models are im-plemented theories: models of language process-ing ... psycholinguis-tics is often oblivious of work in computationallinguistics (CL). To test their theories, psycholin-guists construct computational models of hu-man language processing, but these models of- ten ... thedevelopment of cognitively plausible models of human language processing. This task can be de-composed into a modeling challenge (building models that instantiate known properties of hu-man...

Báo cáo khoa học: "Real-Time Correction of Closed-Captions" potx

... were made up of 1.37M words and 0.17M words, respectively.2. A phoneme based confusion matrix was usedfor scoring the alignment of each word of thevocabulary with every other word of the samevocabulary. ... intoconsideration and the fact that 48% of the wordswere common to both lists. On this basis, we haveconstructed an alternate list of 10 words comprised of the most likely 7 words of case 1; the remaining ... correction, the list of available alter-natives is presented in a list box under each word.These lists are always present, instead of being pre-sented only upon selection of a word. In this...

Báo cáo khoa học: "Automating the Acquisition of Bilingual Terminology" potx

... group consists of 334 NPs which it would not be able to extract because of one or a combination of errors in one of the preprocessing steps. Section 5.3 contains a detailed analysis of these errors. ... classes of fundamental counter-examples. These are the four classes of errors due to preprocessing. 1. Incorrect alignment of text segments accounts for 6% of the errors. 2. In 15% of the ... only frequencies of nouns are compared. Figure 4 shows the result of some experiments. The quality of the methods can be measured in recall -whether or not a translation of a term is found-...

Báo cáo khoa học: "Interactive Discourse: Influence of Problem Context " potx

... critical to the study of language in gener- al, and to the construction of computer systems that can co~nunicate with people in particular. Of course, the issue of the influence of "problem ... construction of computer-based natural language processing systems will address some of the issues of "how" and that all of the panelists will consider the prior questions of what ef- ... subject matter of the discourse. The structure of the information being discussed has an effect on the language (of. Chafe's "The Flow of Language and the Flow of Thought",...

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