ChatDiff: A ChatGPT-based diffusion model for long-tailed classification

doi:10.1016/j.neunet.2024.106794

ChatDiff: A ChatGPT-based diffusion model for long-tailed classification

2025-01-01

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张承阳 (Chengyang Zhang)

DOI：10.1016/j.neunet.2024.106794

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Long-tailed data distributions have been a major challenge for the practical application of deep learning. Information augmentation intends to expand the long-tailed data into uniform distribution, which provides a feasible way to mitigate the data starvation of underrepresented classes. However, most existing augmentation methods face two significant challenges: (1) limited diversity in generated samples, and (2) the adverse effect of generated negative samples on downstream classification performance. In this paper, we propose a novel information augmentation method, named ChatDiff, to provide diverse positive samples for underrepresented classes, and eliminate generated negative samples. Specifically, we start with a prompt template to extract textual prior knowledge from the ChatGPT-3.5 model, enhancing the feature space for underrepresented classes. Then using this prior knowledge, a conditional diffusion model generates semantic-rich image samples for tail classes. Moreover, the proposed ChatDiff leverages a CLIP-based discriminator to screen and remove generated negative samples. This process avoids neural network learning the invalid or erroneous features, and further, improves long-tailed classification performance. Comprehensive experiments conducted on long-tailed benchmarks such as CIFAR10-LT, CIFAR100-LT, ImageNet-LT, and iNaturalist 2018, validate the effectiveness of our ChatDiff method.

Keywords:

Long-tailed learning

Information augmentation

ChatGPT-3.5

Diffusion probabilistic model

Discriminator mechanism

Image classification

ChatDiff: A ChatGPT-based diffusion model for long-tailed classification

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