The acquisition of large-scale, high-quality data is a resource-intensive and time-consuming endeavor. Compared to conventional Data Augmentation (DA) techniques (e.g. cropping and rotation), exploiting prevailing diffusion models for data generation has received scant attention in classification tasks. Existing generative DA methods either inadequately bridge the domain gap between real-world and synthesized images, or inherently suffer from a lack of diversity. To solve these issues, this paper proposes a new classification-oriented framework DreamDA, which enables data synthesis and label generation by way of diffusion models. DreamDA generates diverse samples that adhere to the original data distribution by considering training images in the original data as seeds and perturbing their reverse diffusion process. In addition, since the labels of the generated data may not align with the labels of their corresponding seed images, we introduce a self-training paradigm for generating pseudo labels and training classifiers using the synthesized data. Extensive experiments across four tasks and five datasets demonstrate consistent improvements over strong baselines, revealing the efficacy of DreamDA in synthesizing high-quality and diverse images with accurate labels. Our code will be available at https://github.com/yunxiangfu2001/DreamDA.

该论文提出了一个新的基于扩散模型的分类导向框架DreamDA，通过考虑训练图像中的原始数据作为种子并扰动其反扩散过程，DreamDA生成符合原始数据分布的多样样本，并引入自训练范式生成伪标签和使用合成数据训练分类器，在四个任务和五个数据集上进行的广泛实验证明了DreamDA在合成高质量多样的图像并生成准确标签方面的有效性。

DreamDA: 用扩散模型进行生成型数据增强