KGM, or Kaley, as her lawyers have called her during the trial, started using YouTube at age 6 and Instagram at age 9.
The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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a16z基础设施团队的合伙人Jennifer Li在Big Ideas报告里说了一句让很多人印象深刻的话：企业AI现在最大的瓶颈，不是模型不够聪明，而是自己的数据太乱。她用了一个词——"数据熵"。每家公司都淹没在PDF、截图、邮件、操作日志里，80%的企业知识以非结构化的形式散落在各个角落，从来没有被系统整理过。你买了最好的模型，搭了最贵的系统，但喂进去的是一团乱麻，出来的自然是错误和幻觉。
（二）违法违规收购、租用、出售、出租网络账号，或者明知被用于违法犯罪而出借网络账号的；
intermediate allocations, but unfortunate.