LLM Post-Training 101 + Prompt Engineering vs Context Engineering | AI & ML Monthly

13 Oct 2025 · 75 min
1:14:31

In this September 2025 episode of AI & ML Monthly, the host (Daniel Bourke) walks through a curated set of AI/ML updates with a focus on open‑source. The segment begins with a personal intro and a preview of a new LLM fine‑tuning tutorial. The core of the episode is a deep dive into a "Post‑Training 101" guide that explains how to adapt a pre‑trained LLM to downstream tasks via supervised fine‑tuning, preference training, and various RL variants (RLHF, RLAF, RLVF). The host then showcases Hugging Face’s TRL library now supporting vision‑language fine‑tuning, and discusses prompt engineering versus context engineering, citing an Anthropic guide. A substantial portion is devoted to the recent avalanche of Qwen open‑source models (Qwen‑3 Omni, Next, Guard, VL) and their architectural tricks (active‑expert sparsity, hybrid attention). The episode highlights Modal Notebooks as a fast, low‑latency alternative to Colab, and presents case studies: FineGrain’s object‑cutter pipeline, TensorZero’s cost‑effective fine‑tuning, Thinking Machines’ deterministic inference kernels, and Stephen Tolkan’s tokenizer quirks. Additional resources include EmbeddingGemma, MobileCLIP‑2, a 5‑TB vision dataset (FineVision), OCR model releases (MinerU, PointsReader, PPOCR‑V5, Granite‑Docling), GLM‑4.6, Mistral’s Magistral‑Vision, Gemini Robotics 1.5, and new foundations for time‑series and video models. The host wraps up with a quote from Demis Hassabis and invites listeners to subscribe to the text‑based newsletter.

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