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      <title>解剖极简 SFT 训练器：每个决策，教科书和框架怎么说</title>
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      <description>TRL 的 SFTTrainer 一行就能训，为什么还有人手写 SFT 循环？我把 forge 仓库 Stage 1 的每个决策（chat template、prompt masking、collate 与 loss、bf16、LR schedule、数据、验证）逐一摆到台面上，对照两套教材（rlhf-book、hands-on-modern-rl）、四个生产框架（alignment-handbook、trl、open-instruct、OpenRLHF）和六路信息源：哪些决策有共识，哪些有真实的配方之争，哪些两本教材各自糊弄过去了。</description>
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