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Fix for Issue #684 : Locked flash-attn version to prevent ABI mismatch #686

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Fix for Issue #684 : Locked flash-attn version to prevent ABI mismatch #686

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02df101
Updated README dependency instructions for flash-attn
alexjstephenson Jun 30, 2025
16ad47c
Update READM flash-attn formatting
alexjstephenson Jun 30, 2025
a853173
Updated Makefile with Locked Flash-attn version
alexjstephenson Jun 30, 2025
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2 changes: 1 addition & 1 deletion Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ install:
. openr1/bin/activate && uv pip install --upgrade pip && \
uv pip install vllm==0.8.5.post1 && \
uv pip install setuptools && \
uv pip install flash-attn --no-build-isolation && \
uv pip install flash-attn==2.7.4.post1 --no-build-isolation && \
GIT_LFS_SKIP_SMUDGE=1 uv pip install -e ".[dev]"

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4 changes: 2 additions & 2 deletions README.md
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Expand Up @@ -66,11 +66,11 @@ uv venv openr1 --python 3.11 && source openr1/bin/activate && uv pip install --u
> [!TIP]
> For Hugging Face cluster users, add `export UV_LINK_MODE=copy` to your `.bashrc` to suppress cache warnings from `uv`

Next, install vLLM and FlashAttention:
Next, install vLLM and FlashAttention (use Flash Attention `v2.7.4.post1` to avoid ABI mismatches):

```shell
uv pip install vllm==0.8.5.post1
uv pip install setuptools && uv pip install flash-attn --no-build-isolation
uv pip install setuptools && uv pip install flash-attn==2.7.4.post1 --no-build-isolation
```

This will also install PyTorch `v2.6.0` and it is **very important** to use this version since the vLLM binaries are compiled for it. You can then install the remaining dependencies for your specific use case via `pip install -e .[LIST OF MODES]`. For most contributors, we recommend:
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