23 lines
1.5 KiB
Markdown
23 lines
1.5 KiB
Markdown
# micro-gopt
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A go hand-reimplementation of <https://karpathy.github.io/2026/02/12/microgpt/>.
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Original python is included in the repo for reference against bitrot.
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To use: `go run cmd/main.go input.txt`
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Differences between the Go and the Python, as well as notes more generally:
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* The GPT is implemented as a package and, separately, as a command-line wrapper that calls it, just to keep the algorithm separate from the invocation details.
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* The Value class is more type-safe in go, using values everywhere as opposed to mingling floats and values in the localgrad tuple.
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* The Value struct has actual tests confirming the backward propagation logic.
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* When writing the Value struct and its methods, I accidentally swapped the order of the values in the `localGrads` slice in `Mul` and tore my hair out trying to figure out where the bug was. When I broke down and asked copilot to "compare these two implementations and tell me how they differ," it managed to find the error -- but also reported three non-existent differences and told me that `slices.Backward()` doesn't exist.
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* Initial pass translating the linear algebra functions has me worried that all those value structs aren't going to be very fast...
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* Had to implement weighted random choice. <https://cybernetist.com/2019/01/24/random-weighted-draws-in-go/> made that relatively straightforward; it's a neat algorithm.
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First proper run:
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Something's not right here, unless the hit new baby name is `kaaaaasehaaeaaal`.
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