def _register_extensions()

in xformers/__init__.py [0:0]

• 31 lines of code
• 8 McCabe index (conditional complexity)

def _register_extensions():
    import importlib
    import os

    import torch

    # load the custom_op_library and register the custom ops
    lib_dir = os.path.dirname(__file__)
    if os.name == "nt":
        # Register the main torchvision library location on the default DLL path
        import ctypes
        import sys

        kernel32 = ctypes.WinDLL("kernel32.dll", use_last_error=True)
        with_load_library_flags = hasattr(kernel32, "AddDllDirectory")
        prev_error_mode = kernel32.SetErrorMode(0x0001)

        if with_load_library_flags:
            kernel32.AddDllDirectory.restype = ctypes.c_void_p

        if sys.version_info >= (3, 8):
            os.add_dll_directory(lib_dir)
        elif with_load_library_flags:
            res = kernel32.AddDllDirectory(lib_dir)
            if res is None:
                err = ctypes.WinError(ctypes.get_last_error())
                err.strerror += f' Error adding "{lib_dir}" to the DLL directories.'
                raise err

        kernel32.SetErrorMode(prev_error_mode)

    loader_details = (
        importlib.machinery.ExtensionFileLoader,
        importlib.machinery.EXTENSION_SUFFIXES,
    )

    extfinder = importlib.machinery.FileFinder(lib_dir, loader_details)
    ext_specs = extfinder.find_spec("_C")
    if ext_specs is None:
        raise ImportError
    torch.ops.load_library(ext_specs.origin)