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17Vol71No1
1.
Journal of Theoretical
and Applied Information Technology 10th January 2015. Vol.71 No.1 © 2005 - 2015 JATIT & LLS. All rights reserved. ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195 144 DOES EFFICIENT FUZZY KOHONEN CLUSTERING NETWORK ALGORITHM REALLY IMPROVES CLUSTERING DATA RESULT? 1 EDY IRWANSYAH, 1 MUHAMMAD FAISAL, 2 ANNISAA PRIMADINI 1 Dept. of Computer Science, Bina Nusantara University, Jalan KH. Syahdan No. 9 Palmerah Jakarta 11480, Indonesia 2 Department of Electrical Engineering, University of Indonesia, Depok 16424, Indonesia E-mail: 1 edirwan@binus.ac.id, 1 mhdfaisal93@yahoo.com, 2 primadini.annisaa@gmail.com ABSTRACT In this research, Fuzzy Kohonen Clustering Network (FKCN) algorithm is compared to Efficient Fuzzy Kohonen Clustering Network (EFKCN) algorithm. This research is conducted to see if EFKCN is really efficient and could do a better clustering analysis than original FKCN. We do empirical testing and simulations to compare both algorithms, by using an expanded Fisher’s Iris Data. The result showed the accuracy of EFKCN is not yet better algorithm rather than FKCN. Keywords: Artificial Neural Network, Clustering Analysis, Fuzzy Kohonen Clustering Network, Kohonen Network, Self-orginizing Map, 1. INTRODUCTION Fuzzy Kohonen Clustering Network (FKCN) introduced by [1] is an unsupervised learning clustering analysis method. This algorithm integrates FCM model [2] and Kohonen network [3]. FKCN improved the error convergence as well as reduced labeling errors problem on FCM. FKCN enhances the FCM algorithm and showed great superiority in processing ambiguity and uncertainty of a certain dataset or image. Yang et al, 2009 [4] attempted to make an efficient FKCN (EFKCN) to reduce computation process on the original FKCN. The accuracy of EFKCN achieved 92.7 percent by the fourth iteration. In which, the previous research conducted by [1] didn't show a remarkable result with the same iteration number. The improvement of learning rate computation yields a different result compared to FKCN [1]. Empirical testing with the same data set and algorithm in this research is conducted to find out whether EFKCN is really efficient and could do a better data clustering than the original FKCN. 2. RELATED WORKS Yang et al, 2008 [4] introduced threshold values and dynamic adjustment of the weighting exponent on each fuzzy membership to adjust learning rates dynamically on FKCN by Bezdek et al, 1992 [1]. The error data of EFKCN is just 11 error data by fourth iteration. Meanwhile, FKCN has more than 40 error data with the same iteration. On the top of that, Bezdek at al, 1992 [1] had big number of mistakes in FKCN under the eighth iteration. FKCN has been implemented well for image segmentation [5], [6], [7], [8] and [9]. Atmaca at al, 1996 [5] used FKCN to determine cluster membership values by doing some improvements, Lei at al, 1999 [6] introduced Adaptive FKCN that reduce computation process in image segmentation, by using HSV as color representation, Jabbar at al, 2009 [8] proved FKCN have ability to segment the color image and noisy color image can be segmented more effectively and provide more robust segmentation results by using FKCN with some improvements by Lu et al, 2009 [9]. de Almeida at al, 2012 [10] applied FKCN to an interval of data and proved the of FKCN is better than FCM and, Fan at al, 2013 [11] combined FKCN and motion control algorithm to develop intelligent wheelchair and Irwansyah and Hartati [12] used EFKCN to cluster the building damage hazard due to earthquake and Kriging algorithm to create building damage area zonation at Banda Aceh city, Indonesia.
2.
Journal of Theoretical
and Applied Information Technology 10th January 2015. Vol.71 No.1 © 2005 - 2015 JATIT & LLS. All rights reserved. ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195 145 3. FKCN AND EFKCN ALGORITHM The algorithm of FKCN is summarized as follow: Step 1: Fix c, sample space and threshold error ɛ > 0 some small positive constant. Step 2: Initialize ( )020100 ,...,, cvvvv = choose 0m > 1 and iteration limit ( maxt ) Step 3: For t = 1,2…, maxt a. Compute all learning rates: mtmmt ∆−= *0 , max 1 t m =∆ (1) Where tm is the fuzzy membership for the t iteration and m∆ : fuzzy membership differences for each iteration For each member, update its membership function: 1 1 2 1, 1, , − − − − − − = ∑ m tjk tik tik VX VX u (2) Where tiku , is the membership function of the k-th data of i-th cluster for each t-iteration; kX is the k- th data; 1, −tiV is the i-th cluster center for t-1 iteration; 1, −tjV is the j-th cluster center for t-1 iteration and m is weighting exponent on each fuzzy membership. Compute learning rate ( ) τμ ικ,τικ,τ υα = (3) Where tik,α is the learning rate of the k-th data of i-th cluster for t iteration. b. Update all weight vectors: ( ) ∑ ∑ = − − − − += n j tij n k tiktik titi vx vv 1 , 1 1,, 1,, α α (4) Where iv is i-th cluster center and tiv , is i-th cluster center for t iteration c. Compute the function 1−−= ttt VVE (5) Where tE is error for each t iteration; tV is cluster center for t iteration and 1−tV and cluster center for t-1 iteration. d. If tE <ε stop. Else t = t + 1 goto step 3 The difference between EFKCN and FKCN lies in the learning rate computation, while FKCN uses equation (3), EFKCN follows the equation (6) below: ( ) ( ) ( ) dtik utikd dtik m tik m tik m tik ικ,τ tu tut tu u u u α d t u < ≤≤ > = , , , , , , (6) Where ut and dt are threshold value, ut is upper cut set (0.5,1), dt is lower cut set (0,0.5), um and dm are fuzzy convergence operators, um (0,1) and dm > tm 4. EXPERIMENTS AND RESULT Fisher’s IRIS data [13] is used for the simulations and testing. The IRIS will be expanded 40 times to become a set of 6000 sample data. Simulations of data are executed by using MATLAB R2013a on Intel® Core™ i3 CPU 2.27 Ghz PC with Windows 7 Professional 64-bit operating system and memory of 3072 MB RAM. The result will be compared to the actual cluster center by Hathway and Bezdek, 1995 [14].
3.
Journal of Theoretical
and Applied Information Technology 10th January 2015. Vol.71 No.1 © 2005 - 2015 JATIT & LLS. All rights reserved. ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195 146 Table 1. Result comparison to Yang et al, 2009 FKCN Yang et al (2009) FKCN Irwansyah et al (2014) EFKCN Yang et al (2009) EFKCN Irwansyah et al (2014) Parameter m=3; ε=0.001; tmax=50; c=3 m=3; ε=0.001; tmax=50; c=3 m=3;ε=0.001; tmax=50; c=3; tu=0.7; td=0.3; mu=0.4; m=3; ε=0.001; tmax=50; c=3; tu=0.7; td=0.3; mu=0.4; Correct Number 5480 5427 5560 4513 Correct Rate 91.33% 90.45% 92.67% 75.22% Iteration Number 12 12 4 4 Hathway Cluster Center 5.00 5.93 6.58 3.42 2.77 2.97 1.46 4.26 5.55 0.24 1.32 2.02 Cluster Center 5.01 5.75 6.60 3.14 2.73 3.01 1.48 4.14 5.36 0.25 1.29 1.91 5.04 5.91 6.58 3.38 2.78 2.99 1.60 4.37 5.36 0.30 1.40 1.91 5.00 5.91 6.58 3.41 2.79 3.00 1.48 4.22 5.44 0.25 1.32 1.98 5.32 5.88 6.14 3.24 3.00 2.97 2.38 3.92 4.51 0.63 1.26 1.51 The square sum of the relative cluster center's error 0.1073 0.1208 0.0256 0.0787 Table 2. The clustering result comparison with same iteration number FKCN EFKCN Parameter m=3; ε=0.001; tmax=50; c=3 m=3;ε=0.001; tmax=50; c=3; tu=0.7; td=0.3; mu=0.4; Correct Number 5456 5202 Correct Rate 90.93% 86.70% Iteration Number 10 10 Hathway Cluster Center 5.00 5.93 6.58 3.42 2.77 2.97 1.46 4.26 5.55 0.24 1.32 2.02 Cluster Center 5.04 5.97 6.61 3.37 2.79 3.00 1.60 4.45 5.41 0.30 1.44 1.94 5.01 6.02 6.57 3.37 2.79 2.97 1.58 4.55 5.37 0.28 1.49 1.92 The square sum of the relative cluster center’s error 0.0975 0.0135
4.
Journal of Theoretical
and Applied Information Technology 10th January 2015. Vol.71 No.1 © 2005 - 2015 JATIT & LLS. All rights reserved. ISSN: 1992-8645 www.jatit.org E-ISSN: 1817-3195 147 Figure 1: Number of mistakes FKCN with t = 12 and EFKCN with t = 4 Figure 2: Number of mistakes FKCN and EFKCN with t = 10 Figure 3: Comparison between square sum error and correct rates using FKCN Figure 4: Comparison between square sum error and correct rates using EFKCN The experimental results show the accuracy of EFKCN [4] not yet close to 92.7 percent by fourth iteration (Table 1). Moreover, with t = 4, the accuracy of EFKCN is 75.22 percent. Meanwhile, the accuracy of FKCN [1] with t = 12 achieved 90.45 percent; just slightly different from result by Yang et al, 2009 [4]. Figure 1 showed that number of mistakes in FKCN is always smaller than EFKCN and the square sum error of the relative cluster centers are the smallest number from the experimental result (See Table 1 and Table 2). Table 2 described the result of simulation and testing with same iteration (t = 10). Once again, the result showed the accuracy of FKCN is better than EFKCN, 90.93 percent compared with 86.70 percent. Interestingly, eventhough EFKCN has a lower correct rate than FKCN, computation results showed EFKCN square sum of the relative cluster center is very low. 5. CONCLUSION From the experimental results with same data, either having a different or the same iteration number, EFKCN by Yang et al, 2008 didn’t really improve of the accuracy compared to FKCN by Bezdek et al, 1992. Threshold value and fuzzy convergence operators that are proposed by EFKCN indeed produced small square sum error but couldn’t reach higher correct rates than FKCN. Hence, EFKCN is not yet a better algorithm than FKCN.
5.
Journal of Theoretical
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