I see it in the "2. Model Summary" section (for [2]). In the next section, I see links to Hugging Face to download the DeepSeek-R1 Distill Models (for [3]).

https://github.com/deepseek-ai/DeepSeek-R1?tab=readme-ov-fil...

https://github.com/deepseek-ai/DeepSeek-R1?tab=readme-ov-fil...

The repo contains only the PDF, not actual runnable code for the RL training pipeline.

Publishing a high-level description of the training algorithm is good, but it doesn't count as "open-sourcing", as commonly understood.