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132   Chapter 5 Depression discovery in cancer communities using deep learning






                                Table 5.3 Literature summary of metaclassifiers for SA.


                                                                                 Level of
                 Authors Algorithms used      Data set/Source Polarity   Language granularity
                 Clarke  SVM, k-nearest neighbor, NB, Media (media  Pos/neg  English  Document level
                   et al.  BN, DT, a rule learner  analysis company)
                   [46]
                 Rui et al. NB, SVM           Movie reviews,  Pos/neg    English  Document and
                   [47]                         tweets                             sentence levels
                 Bai [48]  Markov blanket, SVM, NB, ME Movie reviews, news Pos/neg  English  Document level
                                                articles, IMDB
                 Valdivia  SVM, NB, C4.5, BBR  MC, MCE       Pos/neg     Spanish,  Document level
                   et al.                                                  English
                   [49]
                 Walker  NB, SVM, rule-based  Two-sided debates  Stance  English  Document level
                   et al.                       convinceme.net  determination
                   [50]
                 BN, Bayesian network; IMDB, Internet Movie Database; k-NN, kernel nearest neighbor; ME, maximizationeexpectation; NB, naþve
                 Bayes; SVM, support vector machine.




                                       In Ref. [48], the author presents a statistical Markov model
                                    classifier to enhance SA of movie reviews. A model is proposed
                                    to detect interword relationships and build a vocabulary to
                                    enhance the efficiency of a number of common ML classifiers.
                                    The classifier acquires the word interword relationship model
                                    and then constructs a Markov blanket directed acyclic graph
                                    from it. Subsequently, the procedure is perfected to return an
                                    improved accuracy. The author equates the proposed approach
                                    with several well-known and widely used ML algorithms to illus-
                                    trate the efficacy of the proposed approach.
                                       Authors in Ref. [49] work on a Spanish movie review data set,
                                    namely, MuchoCine (MC) in consort with its equivalent English
                                    translation, namely, the MuchoCine English (MCE). They
                                    generate three models SVM, NB, and Bayesian Logistic Regression
                                    (BBR) and combine them using different strategies. The first
                                    model does the same thing on the translated data set. The third
                                    model applies SentiWordNet [26] to the MuchoCine English
                                    data set to assimilate etymological information and create an un-
                                    supervised polarity classifier. Lastly, the authors combine the
                                    output from the different models using diverse techniques such
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