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vllm.distributed.nixl_utils

is_nixl_available 

is_nixl_available() -> bool

Lightweight check for nixl/rixl package without importing it.

Source code in vllm/distributed/nixl_utils.py 
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def is_nixl_available() -> bool:
    """Lightweight check for nixl/rixl package without importing it."""
    import importlib.util

    pkg = "rixl" if current_platform.is_rocm() else "nixl"
    return importlib.util.find_spec(pkg) is not None