Download Algorithms for Fuzzy Clustering: Methods in c-Means by Sadaaki Miyamoto PDF

By Sadaaki Miyamoto

The major topic of this e-book is the bushy c-means proposed through Dunn and Bezdek and their adaptations together with fresh stories. a chief this is why we be aware of fuzzy c-means is that almost all method and alertness reviews in fuzzy clustering use fuzzy c-means, and as a result fuzzy c-means will be thought of to be an important means of clustering usually, regardless even if one is drawn to fuzzy equipment or now not. not like such a lot stories in fuzzy c-means, what we emphasize during this e-book is a relatives of algorithms utilizing entropy or entropy-regularized equipment that are much less recognized, yet we give some thought to the entropy-based technique to be one other precious approach to fuzzy c-means. all through this publication one among our intentions is to discover theoretical and methodological ameliorations among the Dunn and Bezdek conventional process and the entropy-based strategy. We do be aware declare that the entropy-based process is healthier than the conventional approach, yet we think that the equipment of fuzzy c-means turn into complete via including the entropy-based approach to the tactic by way of Dunn and Bezdek, in view that we will be able to realize natures of the either equipment extra deeply via contrasting those two.

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V¯c ), A¯ = (¯ α1 , . . , α ¯ c ), and S¯ = (S¯1 , S¯2 , . . , S¯c ). Covariance Matrices within Clusters 53 FCMAS2. [Find optimal U :] Calculate ¯ = arg min J(U, V¯ , A, ¯ S). 30) U∈Uf FCMAS3. [Find optimal V :] Calculate ¯ , V, A, ¯ S). 31) V FCMAS4. [Find optimal A:] Calculate ¯ , V¯ , A, S). 32) A∈A FCMAS5. [Find optimal S:] Calculate ¯ , V¯ , A, ¯ S). 33) S ¯ or V¯ is convergent, stop; else go to FCMAS2. FCMAS6. [Test convergence:] If U End FCMAS. Notice that J = Jfcmas in this section.

34 Basic Methods for c-Means Clustering Assume v1 , . . , vc are given and suppose we wish to determine a classification rule of nearest prototype. The solution is evident: (i) U1 (x) = 1 0 (vi = arg min1≤j≤c D(x, vj )), (otherwise). 71) where r is sufficiently large so that it contains all prototypes v1 , . . , vc , and we consider the problem inside this region. 72) B(r) U (x) ≥ 0, = 1, . . , c. 73) j=1 We fuzzify this function. We note the above function is not differentiable. We ‘regularize’ the function by considering a differentiable approximation of this function.

M. 88) Normal distributions We have not specified the density functions until now. We proceed to consider normal distributions and estimate the means and variances. For simplicity we first derive solutions for the univariate distributions. After that we show the solutions for multivariate normal distributions. For the univariate normal distributions, 2 (x−μi ) 1 − pi (x|φi ) = √ e 2σi 2 , 2πσi i = 1, . . , m where φi = (μi , σi ). For the optimal solution we should minimize m J= N 2 (x −μ ) 1 − k2σ 2i i ψik log √ e .

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