[mxpf8] Make mxfp8 dim1 cast kernel configurable#1401
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Summary
"triton","cuda", or"torch".Test plan
NGPU=8 CONFIG_FILE="./torchtitan/models/llama3/train_configs/llama3_8b.toml" ./run_train.sh --training.steps=100 --model.converters="mx" --mx.recipe_name="mxfp8" --training.compile --mx.mxfp8_dim1_cast_kernel_choice="triton"NGPU=8 CONFIG_FILE="./torchtitan/models/llama3/train_configs/llama3_8b.toml" ./run_train.sh --training.steps=100 --model.converters="mx" --mx.recipe_name="mxfp8" --training.compile --mx.mxfp8_dim1_cast_kernel_choice="cuda"