Cluster: cluster-13074-4
Base ref: origin/main
Branch: merge-cluster-cluster-13074-4-20260427125508

Merged PRs:

• [Context Parallel] fix: support PyTorch < 2.6 in distributed gather huggingface/diffusers#13075 : Merged cleanly; canonical PR fixes unconditional torch.accelerator usage with reviewed get_device() fallback and CPU error handling.

Skipped PRs:

• None

Failed/conflicting PRs:

• fix: add PyTorch version check for torch.accelerator in gather_size_by_comm huggingface/diffusers#13093 : Conflicted after [Context Parallel] fix: support PyTorch < 2.6 in distributed gather huggingface/diffusers#13075 in gather_size_by_comm; duplicate simpler cuda fallback superseded by [Context Parallel] fix: support PyTorch < 2.6 in distributed gather huggingface/diffusers#13075 .
• Fix context-parallel gather crash on PyTorch < 2.6 huggingface/diffusers#13514 : Conflicted after [Context Parallel] fix: support PyTorch < 2.6 in distributed gather huggingface/diffusers#13075 in the same gather_size_by_comm hunk; duplicate CUDA-specific fallback superseded by [Context Parallel] fix: support PyTorch < 2.6 in distributed gather huggingface/diffusers#13075 .

Notes:

• Issue Distributed gather crashes on PyTorch < 2.6 huggingface/diffusers#13074 is open and all three considered PRs target the same PyTorch < 2.6 distributed gather crash.
• Only src/diffusers/models/_modeling_parallel.py changed relative to origin/main.
• Validation passed: python -m compileall -q src/diffusers/models/_modeling_parallel.py.

Next steps:

• Prefer [Context Parallel] fix: support PyTorch < 2.6 in distributed gather huggingface/diffusers#13075 for this cluster.
• Close or decline fix: add PyTorch version check for torch.accelerator in gather_size_by_comm huggingface/diffusers#13093 and Fix context-parallel gather crash on PyTorch < 2.6 huggingface/diffusers#13514 as duplicate alternatives if maintainers accept [Context Parallel] fix: support PyTorch < 2.6 in distributed gather huggingface/diffusers#13075 .
• Run project style and type checks if this branch is promoted beyond mergeability triage.