Introducing Parallax: a small, hackable async RL repo with all the bells and whistles of a modern Async RL library.
Mixed policy rollouts (pipelineRL), NCCL M2N learner-to-sampler weight streaming, gradient accumulation, and chunked cross-entropy.
Core functionality is ~3,000 lines of Python making it easy to read and ~40k tokens – easily fitting into the context window of even local LLMs.
Built for 0 friction to try out new ideas across algorithms, systems, and data.
Also, obligatory: Parallax Speedrun -- teach Qwen3-0.6B to multiply two five-digit numbers as quickly as possible. Perfect for weekend hacking and autoresearch.
[1/8]