def _check_module_exists(name):
    r"""Returns if a top-level module with :attr:`name` exists *without**
    importing it. This is generally safer than try-catch block around a
    `import X`. It avoids third party libraries breaking assumptions of some of
    our tests, e.g., setting multiprocessing start method when imported
    (see librosa/#747, torchvision/#544).
    """
    if not PY3:  # Python 2
        import imp

        try:
            imp.find_module(name)
            return True
        except ImportError:
            return False
    elif not PY34:  # Python [3, 3.4)
        import importlib

        loader = importlib.find_loader(name)
        return loader is not None
    else:  # Python >= 3.4
        import importlib
        import importlib.util

        spec = importlib.util.find_spec(name)
        return spec is not None
Returns if a top-level module with :attr:`name` exists *without**
    importing it. This is generally safer than try-catch block around a
    `import X`. It avoids third party libraries breaking assumptions of some of
    our tests, e.g., setting multiprocessing start method when imported
    (see librosa/#747, torchvision/#544).
    
tests/cpu/common_utils.py