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IRJET- Ordinal based Classification Techniques: A Survey
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5432 Ordinal Based Classification Techniques: A Survey Anoosha M Rao1, Vinayak S2, Swetha S3 1Student, Dept of Information Science and Engineering, RV College of Engineering, Bangalore-560 059, India 2 Student, Dept of Information Science and Engineering, RV College of Engineering, Bangalore-560 059, India 3Assistant professor, Dept of Information Science and Engineering, RV College of Engineering, Bangalore, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Ordinal classification is a type of supervised learning problem where the target variables exhibit an inherent sense of ordering among them. This differs from a regular classification problem where an input vector is classified into unordered categories. Ordinal classification problems are prevalent in the field of machine learning and pattern recognition. It is used in facial recognition systems, classification of text etc., It plays a major role in theanalysisof data in behavioral sciences. Various algorithms have been proposed to solve the ordinal classification problem. This paper aims to present the advances made in this field and review the methods proposed to perform the same. A comprehensive study of the existing techniqueshasbeenmade and several conclusions regarding the performance of these algorithms have been drawn. Key Words: Classification problem, ordinal classification, regression, error-weighted classification, binary decomposition, neural network, discriminant analysis, cumulative link modelling. 1.INTRODUCTION One of the classic problems of machine learning is categorizing various sets of data into predefined labels. Classification is a type of supervised learning. A general classification problem simply expects the input to be categorized into one of the previously specifiedclasses,each of which is independent of one another. However, ordinal classification involves classifying the input vector into categories possessing an inherent ordering. Consider the example of a student rating his/her knowledge of machine learning. The output variables are Outstanding, Very Good, Good, Mediocre and Poor. These values are categorical but clearly Outstanding > Very Good > Good > Mediocre > Poor. Another property of ordinal categories is that the distance between the adjacent categories are unknown. Also, the distance between categories is not necessarily equal i.e. ‘Outstanding’ is certainly better than ‘Very Good’ and ‘Good’ is better than ‘Mediocre’. But, ‘Good’ might be a lot better than ‘Mediocre’ while ‘Outstanding’ might be slightly better than ‘Very Good’. In a general classification problem, if an input vector v is wrongly classified into class i or to class j while it actually belongs to class k (i not = j not = k), then the penalty for improper classification is the same for both cases i and j. However, the penalty for wrong classification varies for every class in case of ordinal classification. In the example considered previously, the penalty for classifying a vector actually belonging to the ‘Outstanding’ category to ‘Very Good’ category is lesser than that of classifying it to ‘Poor’ category. This penalty variation for erroneous classification is one of the important factors to be considered in ordinal classification. 2. ORDINAL CLASSIFICATION METHODS Ordinal classification can be performed using various approaches. In this section, we explore different methods used to for the same. These methods have been divided into three major groups, namely, traditional approaches, binary decompositionandthresholdmodels.Traditionalapproaches generally involve simplification of ordinal problems into other standard problems in the field of pattern recognition. This includes regression and error-weighted classification. Binary decomposition deals with splitting the target classes into several binary variables whose values are deduced by other classification models.Amethodinvolvingmanymodels and a neural networks approach fall into this category. A variety of methods to perform ordinal classification are includedunderthresholdmodels.Ahierarchicalclassification of the methods mentioned above is representedpictoriallyin Figure 1. Each of these methods is dealt with in detail in the following sections. Fig -1: Hierarchy of ordinal classification method
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5433 2.1 Traditional approaches This involves the transformationofanordinalprobleminto a standardized problem with a known solution. There are mainly two methods that are traditional in nature. They are: 2.1.1 Regression In this method, the ordinal data labels are mapped to certain real numbers [1]. The data labels are now real numbers and hence standardized regression-based algorithms and techniques are utilized for further classification. However, this technique is not devoid of shortcomings. Firstly, in ordinal data, the distance between the classes is unknown due to which it is difficult to convert ordinal numbers into a real valued entity. Secondly, the usage of these real values might hamper the regression algorithm’s performance. Thirdly, regressionalgorithmsare more concerned about the absolute weight of the label rather than the relative positioning of a particular label with respect to other labels [2]. Hence, applying regression techniques do not give correct results. Monedero [3] has proposed a method in which real numbers are chosen by observing inter-class distances of all pairs of data labels,and not randomly. 2.1.2 Error-Weighted Classification: In this approach, the quantification of the error due to incorrect classification is carried outinaccordancetoordinal scale. Tu [4] utilizes the concept of the relative distance between the predicted and actualclasseswhile Kotsiantis[5] treats the cost variable as an absolute entity. The entire process is modelled using a cost values matrix where each element M[i][j] represents the cost of the ijth element. There are several other methods to choose the nature of the cost variable. Lin [6] assigns an asymmetric Gaussian nature to the cost variable. The major drawback of the error-weighted classification method is that there is no method to determine which nature of the cost variable is most suitable for a particular classification problem. 2.2 Binary decomposition Another method of performing ordinal regressioninvolves dividing the final ordinaltargetcategoriesintovariousbinary variables. The values of these variables shall be determined by one or more than one classification models. 2.2.1 A method involving many models In the process of ordinal classification, it can be assessed whether a certain class is greater or lesser than a particular level. Clearly, this is a dual category classification problem. One can determine whether a given pattern y is greater than a specified level l. Assuming that there exist n ordinal categories and that an input must belong to one of these classes, one canassess the target thattheinputmaybelongto by carrying out the aforementioned binary classification on every class. When the outputs of all the n classes are combined, the categorical label to which the input belongs can be effectively determined [7]. In this method, a binary classifier is used on each of the n target labels. The decision regarding the final target is made depending on the probability output values of the binary classifiers. Although the above-mentioned method performs the required classification, it does not take penalties of wrong classification into account. This point was noted by Waegeman [8]andinhiswork,weightswereintroducedsuch that the increase in distance of the predicted class from the actual target class increased the penalty on the system. 2.2.2 A Neural Networks Approach In a general model of a neural network, there exists a set of input nodes, one or more hidden node layers followed by a final layer of output notes. For a general class of binary classification problems, the output layer consists of a single node whose value is either 0 or 1. But for a problem consisting of n output classes, a neural network having n nodes in the output layer is used. The normal method of training a neural network can be used if the expected output value is simply categorical. Since the problem at hand is ordinal, it is necessary toconsidertherelationshipamongthe n output nodes. Generally, for a given input vector v, a target class is determined based on a simple naïve Bayes classifier and the usage of appropriateactivation functions in thehiddenlayer. The regular method does not take into account the inherent ordering among the output classes.Assumingthattherearen output classes, there is no relationship between the conditional probability P(C1/v), P(C2/v) and P(C3/v) for regular categorical data. But it can be established that for ordinal categories, if the input vector belongs to class 3, then the probability of it belonging to class 2 is lesser than that of class 3. Thus, in mathematical notation, it can be said that – Given a set of n ordinal target categories, if an input vector v belongs to a class I, the P(C1/v) < P(C2/v) < P(C3/v) - - - - - - - -< P(Ci/v). Also, P(Cn/v) < P(Cn-1/v) < P(Cn-2/v) < - - - P(Ci/v). This was proposed by Joaquim Pinto da Costa and Jaime S. Cardoso [9]. This ordering among the output probabilities ensures that the ordinal natureof the targetcategorieshasbeentakeninto consideration. Variousevaluationmetricscanbeusedforthis model as well. Root mean square error, Spearman’s coefficient and mean absolute error can be used to check the accuracy of the proposed model.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5434 2.3 Threshold Modelling approach In the process of regression, if the response to a non- discrete variable is ordinal in nature, then, such a variable is called as a latent variable. The modelling approaches which work on this assumption, are called threshold- based approaches [10]. Threshold modelling is the most common approach employed to handle ordinal data. Threshold methods are seen as an enhancement to the traditional modelling approaches. The main distinguishing factor between the two modelling schemes is that, in thresholdmodelling,thedistancebetweenthevariousclasses is not known initially and is determined during further stages. Threshold modelling is also similar to the 0-1 decomposition modelling. The main distinguishing factor is that threshold modelling uses only one mapping scheme for each class, in a given interval. 2.3.1 Cumulative link modelling The POM (Proportionally odds model) [11], belonging to the CML (Cumulative LinkModelling)approach[12]involves the probabilistic analysis of thresholds, with respect to the ordinal scale. This process has been formalized by William [13] and the formalized model is known as the generalized ordered partial proportional odds models. Peterson [14] applies probabilistic concepts only to a specialized group in the existing variable set. This approach is known as Partial proportion modelling. Tutz [15] developed the generalized semi-parametrically structured ordinal modellingapproach. A non-linear POM approach was suggested by Mathieson [16]. This model was enhanced (using evolutionary algorithms) by Dorado [17]. Gestel [18] combined the concepts of logistic regression for ordinal values and non- linear kernels and came up with the Internal rating model. Rennie [19] introduced the ordistic modelling technique as an enhancement to Cumulative Link Modelling. In this method, parameters such as logistic loss and hinge loss (considered for binary classification) are modelled based on probabilistic measuresandarelater,formalized.Thismethod is a bi-threshold based modelling approach. In general, N-1 thresholds partition the data line into N parts. 2.3.2 Support vector machine-based modeling: Support Vector Machine (SVM) is the most widely used classifier for ordinal based classification. This is because of two reasons. Firstly, SVM provides a good general performanceandanappreciablevalueforaccuracy.Secondly, the SVM structure can be easily modified to incorporate threshold-based structures. HerbRich in his papers [20,21] laid down an SVM based approach where features were considered inpairsandanew dataset was created, containing all the values of x d ij = xi − xj and yij = O(yi) − O(yj ), where yi , yj ∈ Set of classes. Shashua and Levin [22] wrote SVM based algorithms to maximize the boundaries between adjacent classes and to maximize the arithmetic total of the margins between classes. Both Herbrich’s and Shashua’s methods have two drawbacks. Firstly, the thresholds are not individually defined due to which the model is inadequate in fully representing an ordinal system. Secondly, there might be a mismatch in the relative ordering of data, as the ordinal inequality has not been taken into account. Keerthi and Chu [23,24] overcame these drawbacks by applying an external constraint on the problem of optimization, by considering only neighbouring class-labels for determining the threshold. The optimal solution constraint wassatisfiedbyallowingeachcategoryto contribute error weights to the SVM hyperplane. CarrizosaandB.Martin-Barragan[25]dividedSVMclassifier- based errors into two types:Upgrade errors and Downgrade errors. Upgrade errors are the errors caused by the prediction of a higher valued class label while Downgrade errors are the errors caused by the prediction of a lower valued class label. Now, the two major objectives are, to maximize both these margins at the same time and to show that all the Pareto-optimal resultscanbefoundoutbysolving the degree two optimization problem. The major drawback of SVM based ordinal classification approach is that it is computationally intensive while handling large datasets. Zhao and Wang [26] introduced the concept of block quantized SVM. An incremental version of the same was proposed by Tsang, Kwok and Cheung [27]. 2.3.3 Other threshold-based approaches: Discriminant analysis for ordinal regression [28] involves the increasing of the distance between the classes while decreasing the size of each class. Discriminant analysis uses various statistical concepts such as covariance and standard deviation. Augmented binary classification [29,30] is a technique, where, an ordinal regression problem is transformed into a binaryclassificationproblembyfollowing 3 steps. The first step uses a coding matrix in which all possible input patternsare mapped into binaryclassification equivalent. The second step involves training the above model with the objective of reducing the loss duetoincorrect classification. The third step involves the framing of a problem-specific classification rule to carry out the final prediction. Perceptron learning [29] is athresholdmodelling technique that utilizes generalized Bayesian concepts. 3. CONCLUSIONS A generic classification approach cannot be applied while handling ordinal data. Extreme care should be taken to ensure that the relative ordering of ordinal data should be maintained at every step of the classification process. Traditional approaches involve regression and error-value based classification techniques. They are, however primitive
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 5435 techniques and cannot be applied on real world data seeking efficient outputs. The many-models scheme is computationally intensive as it involves performing binary classification for all the n different categories of the output. The neural networks approach works well when ordinal classification needs to be performed on a very large dataset. Its ordering of the Bayes probabilities ensures that the ordinal nature of the data is not affected. Various threshold modelling schemes have been suggested and the results obtained out-perform the aforementioned schemes’ performance. Hence, there is a needtounderstandthenature of the problem and apply the relevant threshold modelling scheme to ensureefficient ordinal value-basedclassification. REFERENCES [1] V. Torra, J. Domingo-Ferrer, J. 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