Discriminant analysis of regularized multidimensional scaling

Sohana Jahan

doi:10.3934/naco.2020024

Article Contents

2021, Volume 11, Issue 2: 255-267. Doi: 10.3934/naco.2020024

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Discriminant analysis of regularized multidimensional scaling

Sohana Jahan^1,2,

1.
Department of Mathematics, University of Dhaka, Bangladesh
2.
School of Mathematics, University of Southampton, UK

Received: October 2019

Revised: January 2020

Early access: March 2020

Published: June 2021

This research was supported by the Commonwealth Scholarship BDCS-2012-44

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Abstract

Regularized Multidimensional Scaling with Radial basis function (RMDS) is a nonlinear variant of classical Multi-Dimensional Scaling (cMDS). A key issue that has been addressed in RMDS is the effective selection of centers of the radial basis functions that plays a very important role in reducing the dimension preserving the structure of the data in higher dimensional space. RMDS uses data in unsupervised settings that means RMDS does not use any prior information of the dataset. This article is concerned on the supervised setting. Here we have incorporated the class information of some members of data to the RMDS model. The class separability term improved the method RMDS significantly and also outperforms other discriminant analysis methods such as Linear discriminant analysis (LDA) which is documented through numerical experiments.

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Mathematics Subject Classification: Primary: 62H30, 68T10; Secondary: 90C25.

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Figure 1. Fig. 1(a) shows the separation of the nonseparable two classes of iris data by support vector machine (SVM)algorithm. One class represented "+" and the other one is represented by "$ \diamond $". Over $ 100 $ runs, SRMDS model yielded at an average $ 1 $ misclassified points, while the corresponding number for RMDS was Webb's model is $ 3 $ to $ 5 $. Fig. 1(b) shows SVM applied on 2-dimensional projection of Cancer data. Over $ 100 $ runs, SRMDS model yielded $ 1 $ to $ 3 $ misclassified points. Here support vectors in each image is bounded by "O" and misclassified points (bounded by $ \square $)

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Figure 2. SVM on Seeds data projected in 2 dimensional space by $\text{RMDS}$ is shown in these figures. Where the separation of the classes are shown using multiclass classifier

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Figure 3. Projected 2-dimensional Iris data, consisting of $ 3 $ classes. One class represented by 'red +' is completely separated from the other two. Training points of nonseparable two classes are represented by 'green +' and 'blue +', whereas the testing points projected by SRMDS are represented by 'pink o' and 'red o'. Fig. 3(a) $ \lambda = 0.1 $. Fig. 3(b) $ \lambda = 0.5 $. Fig. 3(c)$ \lambda = 0.9 $, over $ 100 $ random runs. The incresed value of $ \lambda $ puts more weight on preservation of the structure of data

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Figure 4. Projected 2-dimensional Cancer data, consisting of $ 2 $ classes. Training points of the classes are represented by 'red +' and 'blue +', whereas the testing points of respective classes projected by SRMDS are represented by 'green o' and 'pink o' Fig. 4(a) $ \lambda = 0.1 $. Fig. 4(b) $ \lambda = 0.5 $. Fig. 4(c) $ \lambda = 0.9 $, over $ 100 $ random runs. The incresed value of $ \lambda $ puts more weight on preserving the structure of data

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Figure 5. Average stress of dataset for different values of $ \lambda $ over $ 100 $ random runs. The incresed value of $ \lambda $ reduces the stress

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Table 1. List of datasets used in this article and their sources :

Dataset	Dim	Class	no. of ins.	Source
Iris	4	3	150	UCI Repository
Cancer	9	2	683	UCI Repository
Seeds	7	3	210	UCI Repository

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Table 2. Numerical results obtained by applying SVM on three datasets projected using discriminant analysis

	Dataset	MDS	RMDS	SRMDS	Improvment over RMDS
Iris	Support vector	18	13	5
Iris	Missclassified points	6	3	0	66 %
Cancer	Support vector	64	54	47
Cancer	Missclassified points	9	5	1	80 %
Seeds C1	Support vector	42	35	23
Seeds C1	Missclassified points	12	10	5	50 %
Seeds C2	Support vector	20	16	10
Seeds C2	Missclassified points	5	3	2	33 %
Seeds C3	Support vector	24	20	9
Seeds C3	Missclassified points	8	5	2	60 %

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Table 3. Misclassified points obtained by k-nn (3-nn) classifier on three datasets projected by SRMDS and LDA

Dataset	LDA	SRMDS
Iris	0	0
Cancer	4	2
Seeds	20	9

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