Hubs and Hyperspheres: Reducing Hubness and Improving Transductive Few-Shot Learning with Hyperspherical Embeddings

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Documents

  • Fulltext

    Submitted manuscript, 1.39 MB, PDF document

  • Daniel J. Trosten
  • Rwiddhi Chakraborty
  • Sigurd Loksc
  • Kristoffer Knutsen Wickstrøm
  • Jenssen, Robert
  • Michael C. Kampffmeyer

Distance-based classification is frequently used in transductive few-shot learning (FSL). However, due to the high-dimensionality of image representations, FSL classifiers are prone to suffer from the hubness problem, where a few points (hubs) occur frequently in multiple nearest neighbour lists of other points. Hubness negatively impacts distance-based classification when hubs from one class appear often among the nearest neighbors of points from another class, degrading the classifier's performance. To address the hubness problem in FSL, we first prove that hubness can be eliminated by distributing representations uniformly on the hypersphere. We then propose two new approaches to embed representations on the hypersphere, which we prove optimize a tradeoff between uniformity and local similarity preservation - reducing hubness while retaining class structure. Our experiments show that the proposed methods reduce hubness, and significantly improves transductive FSL accuracy for a wide range of classifiers 11Code available at https://github.com/uitml/noHub..

Original languageEnglish
Title of host publicationProceedings - 2023 IEEE/CVF Conference on Computer Vision and Pattern Recognition, CVPR 2023
Number of pages10
PublisherIEEE Computer Society Press
Publication date2023
Pages7527-7536
ISBN (Electronic)9798350301298
DOIs
Publication statusPublished - 2023
Event2023 IEEE/CVF Conference on Computer Vision and Pattern Recognition, CVPR 2023 - Vancouver, Canada
Duration: 18 Jun 202322 Jun 2023

Conference

Conference2023 IEEE/CVF Conference on Computer Vision and Pattern Recognition, CVPR 2023
LandCanada
ByVancouver
Periode18/06/202322/06/2023
SponsorAmazon Science, Ant Research, Cruise, et al., Google, Lambda

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

    Research areas

  • continual, low-shot, meta, or long-tail learning, Transfer

ID: 371288564