time.sleep(2 ** attempt) # 指数退避
一只宠物狗在她和妈妈的腿间转，给屋里带来生气。
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The capacity of each node (how many points it can hold before splitting) controls the shape of the tree. A low capacity means nodes split early, producing a deep tree with many small cells. A high capacity means nodes tolerate more points before splitting, producing a shallow tree with larger cells.
Cheyenne MacDonald for Engadget