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Add pipeline parallel support to TransformersModel #12832

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@hmellor hmellor commented Feb 6, 2025

Depends on changes made by huggingface/transformers#36091.

Tested with Llama 3.1 70B in pp=4 and pp2,tp2 configurations.

The following command can be used for testing:

CUDA_VISIBLE_DEVICES=0,1 vllm serve meta-llama/Llama-3.2-1B-Instruct --disable-log-requests --model-impl transformers --gpu-memory-utilization 0.25 --pipeline-parallel-size 2

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vllm/model_executor/models/transformers.py Outdated Show resolved Hide resolved
log_replacement("input embedding", self.model.get_input_embeddings(),
new_module)
self.model.set_input_embeddings(new_module)
def init_buffers(self, module: nn.Module):
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General comment, might it be better to move this function to a separate transformers_utils file?

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We could, but I worry that would pollute the models directory

for child in module.children():
self.init_buffers(child)

def meta_to_empty(self, module: nn.Module):
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Same, might it be better to move this function to a separate transformers_utils file?

Signed-off-by: Harry Mellor <[email protected]>
Signed-off-by: Harry Mellor <[email protected]>
Signed-off-by: Harry Mellor <[email protected]>
@hmellor hmellor marked this pull request as ready for review February 12, 2025 11:58
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mergify bot commented Feb 12, 2025

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @hmellor.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

@mergify mergify bot added the needs-rebase label Feb 12, 2025
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hmellor commented Feb 12, 2025

Can only be merged after Transformers v4.49, but marking as ready for review so this can be merged soon after.

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