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PiTorch: ML on Baremetal Raspberry Pis | projects

masonjwang.com · 10,863 words · saved by 6 readers

How do you get from a $5 computer to a working language model? We strip away every layer of abstraction and build up from scratch, **running and training models** on a cluster of Pi Zeros. No PyTorch, no OS, not even a standard library.

The Raspberry Pi Zero is a $5 computer with less processing power than a thermostat [ 1 ] . What does it take to run an LLM on it? Train one? How about on four of them, wired together? PiTorch is a baremetal ML framework for the Raspberry Pi Zero's GPU. LLM inference runs 210x faster than the CPU baseline, training 25x. It scales to 4 linked Pis with communication overhead as low as 0.3% of compute time. prog weights state stacks GPU 61× 185× 210× I use interactive diagrams throughout the post to break down the ideas I found most fascinating :) I spent the last few weeks building PiTorch , a f

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