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By comparative study, we show that a Sentiment Dependent Bayesian Network (SDBN) classifier has improved performance on popular review datasets such as Amazon product reviews due to the ability of the Bayesian Network to construct a network structure of multiple dependencies [12].
We will focus on penalizing existing local score metrics with our sentiment-dependent scoring function for the BN classifiers, hence the SDBN proposed in this paper.
Figure 1 shows the structure of a SDBN. In this figure, C denotes the class node and the parent to all the variable nodes [x.sub.1], [x.sub.2] and [x.sub.3].
The proposed SDBN is created from a sentiment dependent score table (SDST) similar to the conventional CPT which contains network parameters from the data.
We conducted set of experiments using the proposed SDBN algorithm on 8 different product review domains.
We performed a grid search with 10-fold cross-validation for the three algorithms and observed that both SDBN and Baseline-BN gave best accuracies using SimpleEstimator with [alpha] = 0.5 and K2 search algorithm with the Bayes/K2 scoring function, while NB performed better with the Kernel Estimator.
We evaluated the performance of the SDBN with reduced attribute sets since attribute selection tends to improve BN's accuracy [16].
As emphasised in Table 1, we observed the proposed SDBN to have improved and sometimes comparable performance with the baseline classifiers.
We also performed experiment using the SDBN for top-10, top-20, top-30, top-50, and top-100 attributes alone as shown in Table 2.
El presente trabajo se desarrollo en dos comunidades: 1) Selva Decidua de Banco (SDBn), alrededores de la pica 8, en la progresiva 2+150.
Las otras parcelas de vegetacion potencial (SsSVsBn y SDBn) son muy similares entre sf (>50%) pero muy diferentes a las de patios (apenas 2%).
TABLA II INDICE DE IMPORTANCIA DE TODAS LAS ESPECIES EN LOS LEVANTAMIENTOS Especie SsSVBj SsSVsBn SDBn Albizia guachapele 0,0 0,0 0,0 Albizia niopoides 0,0 0,0 0,0 Allophyllus racemosus 0,8 0,0 0,0 Annona montana 0,0 0,0 0,0 Astronium graveolens 1,9 0,0 0,0 Attalea butyracea 11,7 8,13 33,7 Banara sp.