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Continual Distillation of Teachers from Different Domains

Summary

Deep learning models are growing so large that their storage needs can exceed those of large-scale datasets. To address this, researchers introduce Continual Distillation (CD), a new paradigm where a student model learns sequentially from a stream of teachers without retaining access to earlier teachers. CD faces two challenges: unavailability of teacher training data and varying teacher expertise. They show that external unlabeled data enables Unseen Knowledge Transfer (UKT), allowing the student to acquire knowledge from domains absent in its training data. Sequential distillation also causes Unseen Knowledge Forgetting (UKF), where transferred knowledge is lost after training on later teachers. To trade off between UKT and UKF, they propose Self External Data Distillation (SE2D), which…

SourcearXiv Machine LearningAuthor: Nicolas Michel, Maorong Wang, Jiangpeng He, Toshihiko Yamasaki
Continual Distillation of Teachers from Different Domains
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[2605.04059] Continual Distillation of Teachers from Different Domains

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Computer Science > Machine Learning

arXiv:2605.04059 (cs)

[Submitted on 10 Apr 2026]

Title:Continual Distillation of Teachers from Different Domains

Authors:Nicolas Michel, Maorong Wang, Jiangpeng He, Toshihiko Yamasaki

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Abstract:Deep learning models continue to scale, with some requiring more storage than many large-scale datasets. Thus, we introduce a new paradigm: Continual Distillation (CD), where a student learns sequentially from a stream of teacher models without retaining access to earlier teachers. CD faces two challenges: teacher training data is unavailable, and teachers have varying expertise. We show that external unlabeled data enables Unseen Knowledge Transfer (UKT), allowing the student to acquire information from domains not present in the training data, while known to the teacher. We also show that sequential distillation causes Unseen Knowledge Forgetting (UKF) when transferred knowledge is lost after training on later teachers. To better trade off between UKT and UKF, we propose Self External Data Distillation (SE2D), a method that preserves logits on external data to stabilize learning across heterogeneous teachers. Experiments on multiple benchmarks show that SE2D reduces UKF and improves cross-domain generalization. The code and implementation for this work are publicly available at: this https URL.

Comments: Accepted to CVPR 2026

Subjects:

Machine Learning (cs.LG); Computer Vision and Pattern Recognition (cs.CV)

Cite as: arXiv:2605.04059 [cs.LG]

(or arXiv:2605.04059v1 [cs.LG] for this version)

https://doi.org/10.48550/arXiv.2605.04059

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arXiv-issued DOI via DataCite

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From: Nicolas Michel Mr [view email] [v1] Fri, 10 Apr 2026 10:26:30 UTC (22,682 KB)

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Key points and analysis

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Key points

  • Proposes Continual Distillation (CD) paradigm where a student learns from a sequence of teachers without access to previous teachers or their data.
  • Identifies two key challenges: Unseen Knowledge Transfer (UKT) and Unseen Knowledge Forgetting (UKF).
  • Introduces Self External Data Distillation (SE2D) method to balance UKT and UKF by storing teacher logits on external data.
  • Experiments demonstrate SE2D reduces forgetting and improves cross-domain generalization on multiple benchmarks.

Highlights and analysis are generated automatically and may contain errors. Check the original source.