和到处都是的 AI 网红不一样，他是真正上手训练过大模型的人。
Fast scanning — parallel session parsing with orjson and fast-reject byte checks that skip ~77% of lines before parsing
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Uniform regions (solid backgrounds, smooth gradients) get stored as large blocks. Detailed regions (edges, textures) get subdivided into smaller blocks. You end up with a compressed representation that preserves detail where it exists and simplifies where it can.