support eval of float8_a1x128_w128x128

[vkuzo]

Summary:

Adds support for the new float8 scaling recipe in the official eval
scripts used to generate accuracy numbers in the README.

For now, I am using this as a smoke test that the scaling is working on
a real model - it is. We can add official benchmark results after we
hook up the cuBLAS binding on H100, which should make the UEX of
running evals a lot better.

Test Plan:

Smoke test on LLama-3.1-8B, accuracy looks good

// download checkpoint
with-proxy python scripts/download.py --hf_token {token} --repo_id meta-llama/Meta-Llama-3.1-8B

// prepare checkpoint
python scripts/convert_hf_checkpoint.py --checkpoint_dir checkpoints/meta-llama/Meta-Llama-3.1-8B

// run bf16 eval on a single task
with-proxy time python torchao/_models/llama/eval.py --checkpoint_path checkpoints/meta-llama/Meta-Llama-3.1-8B/model.pth --tasks 'winogrande'
...
winogrande: {'alias': 'winogrande', 'acc,none': 0.7426992896606156, 'acc_stderr,none': 0.012285989618865697}

// run float8 eval on the same task
with-proxy time python torchao/_models/llama/eval.py --checkpoint_path checkpoints/meta-llama/Meta-Llama-3.1-8B/model.pth --tasks 'winogrande' --quantization float8_a1x128_w128x128 --compile
...
winogrande: {'alias': 'winogrande', 'acc,none': 0.7419100236779794, 'acc_stderr,none': 0.012298278833972477}

Reviewers:

Subscribers:

Tasks:

Tags:

[vkuzo]

Stack from ghstack (oldest at bottom):

• make float8 a1x128_w128x128 granularity serializeable #3279
• -> support eval of float8_a1x128_w128x128 #3269
• Makes fallback float8 1x128 by 128x128 gemm output bfloat16 #3265

[pytorch-bot]

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