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 via Dunn and Bezdek and their diversifications together with fresh reports. a chief for the reason that we be aware of fuzzy c-means is that the majority technique and alertness reports in fuzzy clustering use fuzzy c-means, and for that reason fuzzy c-means might be thought of to be a big means of clustering generally, regardless even if one is drawn to fuzzy equipment or now not. in contrast to such a lot stories in fuzzy c-means, what we emphasize during this e-book is a kin of algorithms utilizing entropy or entropy-regularized tools that are much less identified, yet we give some thought to the entropy-based way to be one other important approach to fuzzy c-means. all through this ebook considered one of our intentions is to discover theoretical and methodological adjustments among the Dunn and Bezdek conventional strategy and the entropy-based procedure. We do be aware declare that the entropy-based process is best than the conventional technique, yet we think that the tools of fuzzy c-means turn into complete by means of including the entropy-based solution to the tactic through Dunn and Bezdek, in view that we will detect natures of the either equipment extra deeply through contrasting those two.

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Take the Mixture Density Model and the EM Algorithm 37 limit a → y and b → y, we then have the probability of the class Ci given the data y: αi pi (y) P (Ci |y) = 2 . 81) αj pj (y) j=1 As this gives us the probability of allocating an observation to each class, the clustering problem is solved; instead of fuzzy membership, we have the probability of membership to a class. 81) is immediately generalized to the case of m classes. The problem is how to obtain good estimates of the parameters. The EM algorithm should be used for this purpose.

63) D (x , vj ) k j=1 N (uki )m xk vi = k=1 N . 24), and the alternate optimization is attained. 65) N uki xk vi = k=1 N . 66) uki k=1 As a typical example of non-Euclidean dissimilarity, we can mention the Minkowski metric: 1 q p (x − v ) q Dq (x, v) = , q ≥ 1. 67) =1 Notice that x is the ’s component of vector x. When q = 1, the Minkowski metric is called the L1 metric or city-block metric. 66) do not. Later we will show an exact and simple optimization algorithm for vi in the case of the L1 metric, while such algorithm is difficult to obtain when q = 1.

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. The codebook vectors are thus cluster centers in this algorithm.

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