I put together a small educational repo that implements distributed training parallelism from scratch in PyTorch:
https://github.com/shreyansh26/pytorch-distributed-training-from-scratch
Instead of using high-level abstractions, the code writes the forward/backward logic and collectives explicitly so you can see the algorithm directly.
The model is intentionally just repeated 2-matmul MLP blocks on a synthetic task, so the communication patterns are the main thing being studied.
Built this mainly for people who want to map the math of distributed training to runnable code without digging through a large framework.
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