Multi-class transductive learning based on ℓ1 Relaxations of Cheeger Cut and Mumford-Shah-Potts Model

Xavier Bresson*, Xue Cheng Tai, Tony F. Chan, Arthur Szlam

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Recent advances in ℓ1 optimization for imaging problems provide promising tools to solve the fundamental high-dimensional data classification in machine learning. In this paper, we extend the main result of Szlam and Bresson (Proceedings of the 27th International Conference on Machine Learning, pp. 1039-1046, 2010), which introduced an exact ℓ1 relaxation of the Cheeger ratio cut problem for unsupervised data classification. The proposed extension deals with the multi-class transductive learning problem, which consists in learning several classes with a set of labels for each class. Learning several classes (i.e. more than two classes) simultaneously is generally a challenging problem, but the proposed method builds on strong results introduced in imaging to overcome the multi-class issue. Besides, the proposed multi-class transductive learning algorithms also benefit from recent fast ℓ1 solvers, specifically designed for the total variation norm, which plays a central role in our approach. Finally, experiments demonstrate that the proposed ℓ1 relaxation algorithms are more accurate and robust than standard ℓ2 relaxation methods s.a. spectral clustering, particularly when considering a very small number of labels for each class to be classified. For instance, the mean error of classification for the benchmark MNIST dataset of 60,000 data in \mathbb{R}^{784} using the proposed ℓ1 relaxation of the multi-class Cheeger cut is 2.4 % when only one label is considered for each class, while the error of classification for the ℓ2 relaxation method of spectral clustering is 24.7 %.

Original languageEnglish (US)
Pages (from-to)191-201
Number of pages11
JournalJournal of Mathematical Imaging and Vision
Volume49
Issue number1
DOIs
StatePublished - Jan 1 2014
Externally publishedYes

Keywords

  • Clustering
  • Data analysis
  • Exact relaxation
  • Fast L1 optimization
  • Min cut
  • Multi-class
  • Potts and Mumford-Shah energies
  • Ratio cut
  • Total variation
  • Transductive learning

ASJC Scopus subject areas

  • Statistics and Probability
  • Modeling and Simulation
  • Condensed Matter Physics
  • Computer Vision and Pattern Recognition
  • Geometry and Topology
  • Applied Mathematics

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