Unsupervised domain adaptation (UDA) has been widely used to transfer knowledge from a labeled source domain to an unlabeled target domain to counter the difficulty of labeling in a new domain. The training of conventional solutions usually relies on the existence of both source and target domain data. However, privacy of the large-scale and well-labeled data in the source domain and trained model parameters can become the major concern of cross center/domain collaborations. In this work, to address this, we propose a practical solution to UDA for segmentation with a black-box segmentation model trained in the source domain only, rather than original source data or a white-box source model. Specifically, we resort to a knowledge distillation scheme with exponential mixup decay (EMD) to gradually learn target-specific representations. In addition, unsupervised entropy minimization is further applied to regularization of the target domain confidence. We evaluated our framework on the BraTS 2018 database, achieving performance on par with white-box source model adaptation approaches.

本文提出了一种基于黑盒分割模型的无监督域自适应解决方案，利用指数混合衰减的知识蒸馏方案逐步学习目标特定表示，并应用无监督熵最小化来规范目标域置信度，最终在BraTS 2018数据库上取得了与白盒源模型适应方法相当的性能。

基于黑盒源模型的分割无监督领域自适应