Sparse-to-dense Feature Matching: Intra and Inter domain Cross-modal
     Learning in Domain Adaptation for 3D Semantic Segmentation
          Duo Peng1 Yinjie Lei1, * Wen Li2 Pingping Zhang3 Yulan Guo4
       1
        Sichuan University 2 University of Electronic Science and Technology of China
       3
        Dalian University of Technology 4 National University of Defense Technology
           duo peng@stu.scu.edu.cn, yinjie@scu.edu.cn, liwenbnu@gmail.com
                 zhpp@dlut.edu.cn,  ...