One of the challenges discussed in the Deepseek v3 paper is the availability of grouped GEMM kernels, which are used to hide the performance impact of many small kernel launches on GPUs. Deepseek uses many small experts (256!) rather than a few larger ones, which exacerbates this problem.

https://eli.thegreenplace.net/2025/decorator-jits-python-as-a-dsl/

Particularly at the giant tech firms where there are many, many smart people, folks look at success and try to copy it. They set themselves up for promotions against the definition of what is expected at the next level. But those expectations describe an average, not a person. Real people are spiky.

https://drscotthawley.github.io/blog/posts/FlowModels.html

GRPO (Group Relative Policy Optimization) is an RL technique originally proposed in the DeepSeekMathpaper. Instead of using a full-blown value network like PPO does, GRPO samples a group of completions for a given prompt and then computes a relative (normalized) reward for each output. The rewards are “verifiable” because they come from checking the final answer against ground truth and confirming. E.g. does the response follow the expected format (i.e. a <think>…</think> block for reasoning and an <answer>…</answer> block for the solution) and is the answer accurate against a predetermined fact. Not every problem fits this model, but there are a bunch that do, including math reasoning with the GSM8Kdataset of grade-school math word problems. These look like this:

This weekend I was reading the Tulu v3 paper (link), which offers a deep dive into building robust post-training setups. This is an very good resource for anyone aiming to build a really robust fine-tuning workflows. It covers critical elements like data set selection, synthetic data generation (with example prompts!), strategies for SFT and preference tuning, and various things they struggled with.

DeepSeek dropped another quality release with their R1 series. The models are an exploration of how to improve improving reasoning capabilities in LLMs. They’ve released a crop of models, which, despite some quirks in its licensing, are extremely helpful. The paper continues the trend of being clear and open.

pytorch.org/vision/main/generated/torchvision.io.decode_image

GitHub – VITA-MLLM/VITA: ✨✨VITA-1.5: Towards GPT-4o Level Real-Time Vision and Speech Interaction

Functionalization in PyTorch: Everything You Wanted To Know – compiler – PyTorch Developer Mailing List