Nathan Lambert 发布了一期 AI 基础讲座视频,使用 GLM 5.2 模型生成。内容涵盖语言模型概述、LM Head、Softmax 与对数概率、训练样本结构、概率计算、后训练中的三种掩码、解码、交叉熵损失、优化与微调、预训练到 SFT 流程、KL 散度与熵、Sigmoid 与成对似然、强化学习 MDP 框架等。视频包含时间戳目录,并持续收集观众问题用于后续 Q&A。
Another quick lecture -- I've been asked many times for prereq's to my book and what you should know, so built a little lecture (with GLM 5.2) to cover some more basics.
Topics include:
00:00 Introduction & Course Prerequisites 01:37 Language Models Overview 02:47 The LM Head 04:29 Softmax & Log-Probabilities 06:13 Anatomy of an LM Training Example 06:37 Computing LLM Probabilities (+Phoebe the Dog) 09:52 Three Common Masks in Post-Training 11:03 A Small Decoding Review 12:14 Training an LM: Cross-Entropy 13:23 Optimization & Fine-Tuning 13:55 Pretraining to Midtraining to SFT Pipeline 15:25 Probability Essentials: KL Divergence & Entropy 19:36 Sigmoid & Pairwise Likelihood 20:29 Reinforcement Learning Framing (MDP) 22:28 Transitioning Tools into Post-Training 23:12 Recommended Resources & Wrap-Up Happy learning and I'm still taking questions from during the course for Q&A videos.