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Show HN: Single file transformers implementation for learning

This was entirely written by Grok 3.0.

The focus was on being able to demonstrate training, inference and attention, all in one file;

This can be run on a GPU thanks to cupy, a kernel needn't be written for this whole thing to run. I definitely think that more people can mess around with different attention mechanisms and models and try training models out on their computers. That is the post.