Get Algorithms for Fuzzy Clustering: Methods in c-Means PDF

By Sadaaki Miyamoto

ISBN-10: 3540787364

ISBN-13: 9783540787365

The major topic of this publication is the bushy c-means proposed via Dunn and Bezdek and their adaptations together with fresh experiences. a prime for the reason that we be aware of fuzzy c-means is that the majority technique and alertness stories in fuzzy clustering use fuzzy c-means, and for that reason fuzzy c-means may be thought of to be an enormous means of clustering as a rule, regardless even if one is drawn to fuzzy tools or no longer. not like such a lot stories in fuzzy c-means, what we emphasize during this publication is a relatives of algorithms utilizing entropy or entropy-regularized tools that are much less recognized, yet we think of the entropy-based way to be one other worthwhile approach to fuzzy c-means. all through this booklet one in every of our intentions is to discover theoretical and methodological changes among the Dunn and Bezdek conventional strategy and the entropy-based technique. We do observe declare that the entropy-based strategy is best than the normal strategy, yet we think that the equipment of fuzzy c-means develop into complete through including the entropy-based option to the strategy by means of Dunn and Bezdek, considering that we will be able to realize natures of the either equipment extra deeply by way of contrasting those two.

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Extra resources for Algorithms for Fuzzy Clustering: Methods in c-Means Clustering with Applications

Example text

C (for example, select c objects randomly as mi , i = 1, . . , c). LVQC2. For t = 1, 2, . . , repeat LVQC3–LVQC5 until convergence (or until the maximum number of iterations is attained). LVQC3. Select randomly x(t) from X. LVQC4. Let ml (t) = arg min x(t) − mi (t) . 1≤i≤c 30 Basic Methods for c-Means Clustering LVQC5. Update m1 (t), . . , mc (t): ml (t + 1) = ml (t) + α(t)[x(t) − ml (t)], mi (t + 1) = mi (t), i = l. Object represented by x(t) is allocated to Gl . End LVQC. In this algorithm, the parameter α(t) satisfies ∞ ∞ α(t) = ∞, t=1 α2 (t) < ∞, t = 1, 2, · · · t=1 For example, α(t) = Const/t satisfies these conditions.

3. 3 Covariance Matrices within Clusters Inclusion of yet another variable is important and indeed has been studied using different algorithms. That is, the use of ‘covariance matrices’ within clusters. 4 where we find two groups, one of which is circular while the other is elongated. 5 which fails to separate the two groups. All methods of crisp and fuzzy c-means as well as FCMA in the last section fails to separate these groups. The reason of the failure is that the cluster allocation rule is basically the nearest neighbor allocation, and hence there is no intrinsic rule to recognize the long group to be a cluster.

23) is related to the crisp A question arises how the fuzzy solution U one. We have the next proposition. 2. 4), on the condition that the nearest center to any xk is unique. In other words, for all xk , there exists unique vi such that i = arg min D(xk , v ). 1≤ ≤c Proof. Note 1 −1= uki 1 m−1 D(xk , vi ) D(xk , vj ) j=i . Assume vi is nearest to xk . Then all terms in the right hand side are less than unity. Hence the right hand side tends to zero as m → 1. Assume vi is not nearest to xk . Then a term in the right hand side exceeds unity.

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Algorithms for Fuzzy Clustering: Methods in c-Means Clustering with Applications by Sadaaki Miyamoto

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