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学院入口页已做中文审核，但许多深度课程暂时仍以英文正文为准。
我们先把最值得长期保留的教育入口做出来，再逐步扩展到更多课程和参考页。这样既实用，也更容易长期维护。
适合刚开始理解 AI 的读者，目前正文仍以英文为主。
理解 token、训练和 Transformer 的关键入口。
和模型退化、工具链、代理质量直接相关。