Class-Incremental Learning with Generative Classifiers

• URL: http://arxiv.org/abs/2104.10093v1
• Date: Tue, 20 Apr 2021 16:26:14 GMT
• Title: Class-Incremental Learning with Generative Classifiers
• Authors: Gido M. van de Ven, Zhe Li, Andreas S. Tolias
• Abstract summary: We propose a new strategy for class-incremental learning: generative classification. Our proposal is to learn the joint distribution p(x,y), factorized as p(x|y)p(y), and to perform classification using Bayes' rule. As a proof-of-principle, here we implement this strategy by training a variational autoencoder for each class to be learned.
• Score: 6.570917734205559
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Incrementally training deep neural networks to recognize new classes is a challenging problem. Most existing class-incremental learning methods store data or use generative replay, both of which have drawbacks, while 'rehearsal-free' alternatives such as parameter regularization or bias-correction methods do not consistently achieve high performance. Here, we put forward a new strategy for class-incremental learning: generative classification. Rather than directly learning the conditional distribution p(y|x), our proposal is to learn the joint distribution p(x,y), factorized as p(x|y)p(y), and to perform classification using Bayes' rule. As a proof-of-principle, here we implement this strategy by training a variational autoencoder for each class to be learned and by using importance sampling to estimate the likelihoods p(x|y). This simple approach performs very well on a diverse set of continual learning benchmarks, outperforming generative replay and other existing baselines that do not store data.

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