Limited transferability hinders the performance of deep learning models when applied to new application scenarios. Recently, Unsupervised Domain Adaptation (UDA) has achieved significant progress in addressing this issue via learning domain-invariant features. However, the performance of existing UDA methods is constrained by the large domain shift and limited target domain data. To alleviate these issues, we propose DomAin-guided Conditional Diffusion Model (DACDM) to generate high-fidelity and diversity samples for the target domain. In the proposed DACDM, by introducing class information, the labels of generated samples can be controlled, and a domain classifier is further introduced in DACDM to guide the generated samples for the target domain. The generated samples help existing UDA methods transfer from the source domain to the target domain more easily, thus improving the transfer performance. Extensive experiments on various benchmarks demonstrate that DACDM brings a large improvement to the performance of existing UDA methods.

通过引入类别信息和领域分类器，DomAin-guided Conditional Diffusion Model (DACDM) 生成的样本有助于现有的无监督领域自适应方法更轻松地从源域传递到目标域，从而提高了转移性能。DACDM 在各种基准测试中的大量实验证明了其对现有无监督领域自适应方法性能的显著提升。

领域引导条件扩散模型的无监督领域自适应