Unconstrained Fuzzy C-Means Algorithm

Feiping Nie, Runxin Zhang, Weizhong Yu, Xuelong Li

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Fuzzy C-Means algorithm (FCM) is one of the most commonly used fuzzy clustering algorithm, which uses the alternating optimization algorithm to update the membership matrix and the cluster center matrix. FCM achieves effective results in clustering tasks. However, due to many constraints, the objective function is inconvenient to optimize directly and is prone to converges to a suboptimal local minimum, which affects the clustering performance. In this paper, we propose a minimization problem equivalent to FCM. Firstly, we use the optimal solution when fixing the cluster center matrix to replace the membership matrix, transforming the original constrained optimization problem into an unconstrained optimization problem, thus reducing the number of variables. We then use gradient descent instead of alternating optimization to solve the model, so we call this model UC-FCM. Extensive experimental results show that UC-FCM can obtain better local minimum and achieve superior clustering performance compared to FCM under the same initialization. Moreover, UC-FCM is also competitive compared with other advanced clustering algorithms.

Original languageEnglish
Pages (from-to)3440-3451
Number of pages12
JournalIEEE Transactions on Pattern Analysis and Machine Intelligence
Volume47
Issue number5
DOIs
StatePublished - 2025

Keywords

  • Fuzzy C-Means
  • gradient descent
  • local minimum
  • membership matrix

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