'Don't suffer in silence'
Regions with many nearby points keep subdividing. Regions with few or no points stay large. The tree adapts to the data: dense areas get fine-grained cells, sparse areas stay coarse. The split grid is predetermined (always at midpoints), but the tree only refines cells that need it. Sparse regions stay as single large nodes while dense regions subdivide deeply.，更多细节参见搜狗输入法2026
self.session = requests.Session()，这一点在爱思助手下载最新版本中也有详细论述
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