Multi-Source Domain Adaptation for Object Detection [article]

Xingxu Yao, Sicheng Zhao, Pengfei Xu, Jufeng Yang
<span title="2021-06-30">2021</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
To reduce annotation labor associated with object detection, an increasing number of studies focus on transferring the learned knowledge from a labeled source domain to another unlabeled target domain. However, existing methods assume that the labeled data are sampled from a single source domain, which ignores a more generalized scenario, where labeled data are from multiple source domains. For the more challenging task, we propose a unified Faster R-CNN based framework, termed Divide-and-Merge
more &raquo; ... Spindle Network (DMSN), which can simultaneously enhance domain invariance and preserve discriminative power. Specifically, the framework contains multiple source subnets and a pseudo target subnet. First, we propose a hierarchical feature alignment strategy to conduct strong and weak alignments for low- and high-level features, respectively, considering their different effects for object detection. Second, we develop a novel pseudo subnet learning algorithm to approximate optimal parameters of pseudo target subset by weighted combination of parameters in different source subnets. Finally, a consistency regularization for region proposal network is proposed to facilitate each subnet to learn more abstract invariances. Extensive experiments on different adaptation scenarios demonstrate the effectiveness of the proposed model.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="">arXiv:2106.15793v1</a> <a target="_blank" rel="external noopener" href="">fatcat:7bq2o3g6t5h73hd4oriwymgfem</a> </span>
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