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Evolutionary Mahalanobis Distance-Based Oversampling for Multi-Class Imbalanced Data Classification.

Leehter Yao1, Tung-Bin Lin1

  • 1Department of Electrical Engineering, National Taipei University of Technology, Taipei 10618, Taiwan.

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|October 13, 2021
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Summary
This summary is machine-generated.

Imbalanced sensing data can be effectively addressed using evolutionary Mahalanobis distance oversampling (EMDO). This novel method generates synthetic minority samples, outperforming existing oversampling techniques in multi-class classification tasks.

Keywords:
MOPSOclassificationellipsoidmahalanobis distanceminority classoversampling

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Area of Science:

  • Machine Learning
  • Data Science
  • Artificial Intelligence

Background:

  • Imbalanced data distribution is a common challenge in sensing data classification.
  • Oversampling minority classes is a key strategy to mitigate imbalance.
  • Existing oversampling methods may not adequately address multi-class scenarios.

Purpose of the Study:

  • To propose an effective oversampling method for multi-class imbalanced data classification.
  • To introduce evolutionary Mahalanobis distance oversampling (EMDO).
  • To enhance minority class representation using synthetic data generation.

Main Methods:

  • EMDO employs ellipsoids to approximate minority class decision regions.
  • Multi-objective particle swarm optimization (MOPSO) and Gustafson-Kessel algorithm are integrated.
  • Synthetic minority samples are generated based on Mahalanobis distance within ellipsoids, with quantity determined by local density.

Main Results:

  • Computer simulations demonstrate EMDO's effectiveness.
  • EMDO shows superior performance compared to widely used oversampling schemes.
  • The method successfully generates synthetic minority samples tailored to data distribution.

Conclusions:

  • EMDO offers a robust solution for multi-class imbalanced data classification.
  • The proposed method improves classification accuracy by balancing data distributions.
  • EMDO represents a significant advancement in oversampling techniques for imbalanced sensing data.