GAM: Hierarchical Graph-based Agentic Memory for LLM Agents. - Zhaofen Wu; Hanrong Zhang; Fulin Lin; Wujiang Xu; Xinran Xu; Yankai Chen 001; Henry Peng Zou; Shaowen Chen; Weizhi Zhang 001; Xue Liu 001; Philip S. Yu; Hongwei Wang (ACL (1), 2026)