multinomial naive bayes for text categorization revisited
Tài liệu Báo cáo khoa học: "Learning with Unlabeled Data for Text Categorization Using Bootstrapping and Feature Projection Techniques" doc
... Models for Naive Bayes Text Classification. AAAI ’98 workshop on Learning for Text Categorization, pp. 41-48. K. P. Nigam, A. McCallum, S. Thrun, and T. Mitchell, 1998, Learning to Classify Text ... centroid-contexts and contexts selected by the similarity measure. Using the context-clusters as labeled training data, a Naive Bayes classifier can be built. Since the Naive Bayes classifier ... clustering algorithms for text categorization (Slonim et al., 2002). Nigam studied an Expected Maximization (EM) technique for combining labeled and unlabeled data for text categorization in...
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A Comparison of Event Models for Naive Bayes Text Classi cation potx
... classification performanceon five text corpora. We find that the multi-variateBernoulli performs well with small vocabulary sizes,but that the multinomial performs usually performseven better ... other given the con- text of the class. This is the so-called naive Bayes assumption.” While this assumption is clearly falsein most real-world tasks, naive Bayes often performsclassification ... community aboutthe naive Bayes classifier because there are two dif-ferent generative models in common use, both of whichmake the naive Bayes assumption.” Both are called naive Bayes by their...
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Tài liệu Word Segmentation for Vietnamese Text Categorization: An online corpus approach pptx
... mapping method for text categorization and retrieval. ACM Transaction on Information System (TOIS’94): 252-277. \ [18] Yiming Yang, Xin Liu 1999. A re-examination for text categorizationmethods. ... experiment. B. Text Categorization Experiment As we stated above, there are many approaches performing text categorization task. Nevertheless, the best performance approach for English may not ... this task for future works. In this part, we perform a simple text categorization experiment for testing our segmentation approach based on 172 3 However, we argue that both above formulas...
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Báo cáo khoa học: "Exploiting Comparable Corpora and Bilingual Dictionaries for Cross-Language Text Categorization" potx
... and low cost solu-tion for the Cross-Language Text Categorization task. In particular, when bilingual dictionar-ies/repositories are available, the performance ofthe categorization gets close ... of texts defined by T∗=iTi. Ifthe function ψ exists for every text tiz∈ T∗and for every language Lj, and is known, then thecorpus is parallel and aligned at document level. For ... Melamed. 2001. Empirical Methods for ExploitingParallel Texts. The MIT Press.L. Rigutini, M. Maggini, and B. Liu. 2005. An EMbased training algorithm for cross-language text cat-egorizaton. In Proceedings...
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Tài liệu Báo cáo khoa học: "An ERP-based Brain-Computer Interface for text entry using Rapid Serial Visual Presentation and Language Modeling" ppt
... symbols is removed and, like before, theuser can take a break and then the system continueswith the next epoch.3 Language ModelingLanguage modeling is important for many text pro-cessing applications, ... impairedusers. Simpler interactions via brain-computer in-terfaces (BCI) hold much promise for effective text communication for these most impaired users. Yetthese simple interfaces have yet to take full ... for each stimulus. Sixth, the conditional prob-ability of each letter given the typed history is ob-tained from the language model. Seventh, Bayesianfusion (which assumes the EEG-based informationand...
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Tài liệu Báo cáo khoa học: "Demonstration of the UAM CorpusTool for text and image annotation" docx
... specific file for annotation at a specific layer (each file has a button for each layer). 3 Tag Hierarchy Editing Most of the current text annotation tools lack built-in facilities for creating ... CorpusTool allows for partially overlap-ping segments, and embedding of segments. Annotated texts are stored using stand-off XML, one file per source text and layer. See Figure 4 for a sample. ... been necessary where software for automatic annotation has not been available, e.g., for linguistic patterns which are not easily identi-fied by machine, or for languages without suffi-cient...
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Tài liệu Báo cáo khoa học: "Outilex, a Linguistic Platform for Text Processing" pdf
... put in our RTNs. This can be used, for instance, to insert tags in texts and thereforeformalize relations between identified segments.This formalism allows for the construction oflocal grammars ... Dataare structured both in standard XML formats andin more compact ones. Format converters are in-cluded in the platform. The WRTN formalism al-lows for combining statistical methods with meth-ods ... context-free grammar) and a text in theform of an acyclic finite state automaton (insteadof a word sequence). The result of the parsingconsists of a shared forest of weighted syntactictrees for...
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Tài liệu Báo cáo khoa học: "Seeing stars: Exploiting class relationships for sentiment categorization with respect to rating scales" doc
... examples for learning sentiment. In Workshop onthe Analysis of Informal and Formal Information Exchangeduring Negotiations (FINEXIN).Liu, Hugo, Henry Lieberman, and Ted Selker. 2003. A modelof textual ... “straightforward”,“likeable” (class 2). Some unexpected distinguish-ing terms for this author are “lion” for class 2 (three-class case), and for class 2 in the four-class case,“jennifer”, for ... deviation of PSP for reviews expressing different ratings.But before proceeding, we note that it is possi-ble that similarity information might yield no extrabenefit at all. For instance, we...
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Tài liệu Báo cáo khoa học: "Fragments and Text Categorization" pptx
... highestimpact was observed for J48. Thus, for instance for Czech, it was observed for fragments that the ac-curacy was higher for 14 out of 15 tasks when J48had been used, and for 12 out of 15 in ... of text categoriza-tion. For the Na¨ıve Bayes classifier this increase issignificant.1 MotivationIn the process of automatic classifying documentsinto several predefined classes – text categorization (Sebastiani, ... also looked for the optimal length of fragments.We found that for the lengths of fragments for therange about the average document length (in thelearning set), the accuracy increased for the signifi-cant...
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Tài liệu Báo cáo khoa học: "DiMLex: A lexicon of discourse markers for text generation and understanding" docx
... in text understanding In text understanding, discourse markers serve as cues for inferring the rhetorical or seman- tic structure of the text. In the approach pro- posed by Marcu [1997], for ... based formalism that allows for a compact representation of individual descriptions, hy- ponymic relations between them, and polyse- mous entries. 3 Using DiMLex in text generation Present text ... ory: Towards a functional theory of text organi- zation." In: TEXT, 8:243-281, 1988 D. Marcu. "The rhetorical parsing of natural lan- guage text. " In: Proceedings of the 35th...
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khai phá dữ liệu dùng thuật toán K-mean và naive bayes trên wave
... 43@dataf,f,e,t,n,f,c,n,k,e,e,s,s,w,w,p,w,o,p,k,s,ux,s,y,t,a,f,c,b,k,e,c,s,s,w,w,p,w,o,p,n,n,gb,s,w,t,l,f,c,b,n,e,c,s,s,w,w,p,w,o,p,n,n,mx,y,w,t,p,f,c,n,n,e,e,s,s,w,w,p,w,o,p,k,s,ux,s,g,f,n,f,w,b,k,t,e,s,s,w,w,p,w,o,e,n,a,gx,y,y,t,a,f,c,b,n,e,c,s,s,w,w,p,w,o,p,k,n,gb,s,w,t,a,f,c,b,g,e,c,s,s,w,w,p,w,o,p,k,n,mb,y,w,t,l,f,c,b,n,e,c,s,s,w,w,p,w,o,p,n,s,mx,y,w,t,p,f,c,n,p,e,e,s,s,w,w,p,w,o,p,k,v,gb,s,y,t,a,f,c,b,g,e,c,s,s,w,w,p,w,o,p,k,s,m Kết quả kiểm thử mô hình như sau : === Run information ===Scheme: weka.classifiers .bayes. NaiveBayesRelation: mushroomInstances: 8124Attributes: 23Test mode: user ... Các phương pháp dựa trên luật (Rule-based Methods)- Các phương pháp Bayes «Ngây thơ» (Na¨ıve Bayes) và mạng tin cậy Bayes (Bayesian Belief Networks)- Các phương pháp máy vector hỗ trợ (Support ... CSDLDM Data Mining Khai phá dữ liệuFCM Fuzzy c-Mean Thuật toán c-Mean mờNB Naıve Bayes Thuật toán Naive Bayes FP False positives Khẳng định saiFN False negatives Phủ định saiTP True positives...
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Báo cáo khoa học: "A Study on Automatically Extracted Keywords in Text Categorization" doc
... bestate-of-the-art.3 Text Categorization ExperimentsThis section describes in detail the four experi-mental settings for the text categorization exper-iments.3.1 Corpus For the text categorization ... acommon form. In addition, any of a number offeature selection metrics may be applied to furtherreduce the space, for example chi-square, or infor-mation gain (see for example Forman (2003) for ... improve text categorization. Insummary we show that a higher perfor-mance — as measured by micro-averagedF-measure on a standard text categoriza-tion collection — is achieved when thefull-text...
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Báo cáo khoa học: "A Comparison and Semi-Quantitative Analysis of Words and Character-Bigrams as Features in Chinese Text Categorization" potx
... Chinese text process-ing tasks, but no systematic comparison or analysis of their values as features for Chinese text categorization has been re-ported heretofore. We carry out here a full performance ... similar comparative studies have been re-ported for Text Categorization (Li et al., 2003) so far in literature. Text categorization and Information Retrieval are tasks that sometimes share ... Space Model (VSM) in text information processing, document indexing (term extraction) acts as a pre-requisite step in most text information proc-essing tasks such as Information Retrieval (Baeza-Yates...
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Báo cáo khoa học: "A Generalized Vector Space Model for Text Retrieval Based on Semantic Relatedness" pot
... reveals thatsemantic information can boost text retrieval performance with the use of theproposed GVSM.1 IntroductionThe use of semantic information into text retrievalor text classification has ... controversial. For example in Mavroeidis et al. (2005) it was shownthat a GVSM using WordNet (Fellbaum, 1998)senses and their hypernyms, improves text clas-sification performance, especially for small ... represent-ing users’ information needs. Let also tisymbol-70showed that this can improve text categorization. Stokoe et al. (Stokoe et al., 2003) reported an im-provement in retrieval performance using...
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Báo cáo khoa học: "Evaluating Centering-based metrics of coherence for text structuring using a reliably annotated corpus" doc
... Entity Coherence for Descriptive Text Structuring. Ph.D. the-sis, Division of Informatics, University of Ed-inburgh.Rodger Kibble and Richard Power. 2000. Anintegrated framework for text planning ... Evaluating the coherence of a text and text structuringThe statistics about transitions computed asjust discussed can be used to determine the de-gree to which a text conforms with, or violates,Centering’s ... M.CHEAP. The exact number of BfCs for which the classification rate of M.NOCB is lowerthan its competitor for each comparison is re-ported in the next column of the Table. For ex-ample, M.NOCB has...
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