Balanced mini-batch training for imbalanced image data classification with neural network

Ryota Shimizu, Kosuke Asako, Hiroki Ojima, Shohei Morinaga, Mototsugu Hamada, Tadahiro Kuroda

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    We propose a novel method of training neural networks for industrial image classification that can reduce the effect of imbalanced data in supervised training. We considered visual quality inspection of industrial products as an image-classification task and attempted to solve this with a convolutional neural network; however, a problem of imbalanced data emerged in supervised training in which the neural network cannot optimize parameters. Since most industrial products are not defective, samples of defective products were fewer than those of the non-defective products; this difference in the number of samples causes an imbalance in training data. A neural network trained with imbalanced data often has varied levels of precision in determining each class depending on the difference in the number of class samples in the training data, which is a significant problem in industrial quality inspection. As a solution to this problem, we propose a balanced mini-batch training method that can virtually balance the class ratio of training samples. In an experiment, the neural network trained with the proposed method achieved higher classification ability than that trained with over-sampled or undersampled data for two types of imbalanced image datasets.

    Original languageEnglish
    Title of host publicationProceedings - 2018 1st IEEE International Conference on Artificial Intelligence for Industries, AI4I 2018
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages27-30
    Number of pages4
    ISBN (Electronic)9781538692097
    DOIs
    Publication statusPublished - 2019 Mar 11
    Event1st IEEE International Conference on Artificial Intelligence for Industries, AI4I 2018 - Laguna Hills, United States
    Duration: 2018 Sep 262018 Sep 28

    Publication series

    NameProceedings - 2018 1st IEEE International Conference on Artificial Intelligence for Industries, AI4I 2018

    Conference

    Conference1st IEEE International Conference on Artificial Intelligence for Industries, AI4I 2018
    CountryUnited States
    CityLaguna Hills
    Period18/9/2618/9/28

    Keywords

    • convolutional neural network
    • image classification
    • imbalanced data
    • mini-batch training
    • visual quality inspection

    ASJC Scopus subject areas

    • Artificial Intelligence
    • Industrial and Manufacturing Engineering

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