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switch float8 logic from Float8DynamicLinear to Float8Linear (pytorch…
…#436) Summary: After pytorch-labs/float8_experimental#300, `Float8Linear` with default settings is equivalent to `Float8DynamicLinear`. This PR changes `torchtitan` to use `Float8Linear`. To support the new UX of `float8_experimental` better, I also switched the `fp8_linear` configuration to be a boolean on whether to swap the linears or not. In the future we can add new options on how to configure each linear (scaling type, scaling granularity, etc) - saving that for a future PR. Test Plan: ``` // run baseline (Float8DynamicLinear) for llama3_8b for 50 iterations on 4 GPUs, // verify performance and loss values do not change meaningfully between // baseline and this PR // baseline (before this PR) // 1. compile, bf16 // 2. compile, float8 // 3. compile, float8, fdsp_fp8_allgather=True // 4. compile, float8, fdsp_fp8_allgather=True, tp=2 // logs: https://gist.github.com/vkuzo/e6d5f3b15349862bfad3706baad8c9ce // experiment (this PR): repeat all of the above, but with Float8Linear // logs: https://gist.github.com/vkuzo/a4d6754358facffa64df931654459631 ``` Reviewers: Subscribers: Tasks: Tags:
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