Autoencoding-Free Context Compression for LLMs via Contextual Semantic Anchors - Liu, Xin; Zhao, Runsong; Huang, Pengcheng; Liu, Xinyu; Xiao, Junyi; xiao, chunyang; Xiao, Tong; Gao, Shengxiang; Yu, Zhengtao; Zhu, JingBo (International Conference on Learning Representations, 2026)