A framework of variable-length sequence data preprocessing based on semantic perception Xiaodong WANG, Jiwei WANG, Zhihao ZHONG, Huan YANG, Hongjing YAO and Yangming GUO JNWPU, 43 2 (2025) 388-397 Published online: 04 June 2025 DOI: 10.1051/jnwpu/20254320388