How to use the qcengine.config.NodeDescriptor function in qcengine

load_path = path
            break

    if load_path is None:
        LOGGER.info("Could not find 'qcengine.yaml'. Searched the following paths: {}".format(", ".join(test_paths)))
        LOGGER.info("Using default options...")

    else:
        import yaml

        LOGGER.info("Found 'qcengine.yaml' at path: {}".format(load_path))
        with open(load_path, "r") as stream:
            user_config = yaml.load(stream)

        for k, v in user_config.items():
            NODE_DESCRIPTORS[k] = NodeDescriptor(name=k, **v)

Find the correct NodeDescriptor based off current hostname
    """
    if isinstance(hostname, NodeDescriptor):
        return hostname

    if hostname is None:
        hostname = get_global("hostname")

    # Find a match
    for name, node in NODE_DESCRIPTORS.items():

        if fnmatch.fnmatch(hostname, node.hostname_pattern):
            config = node
            break
    else:
        config = NodeDescriptor(
            name="default", hostname_pattern="*", memory=get_global("memory"), ncores=get_global("ncores")
        )

    return config

def get_node_descriptor(hostname: Optional[str] = None) -> NodeDescriptor:
    """
    Find the correct NodeDescriptor based off current hostname
    """
    if isinstance(hostname, NodeDescriptor):
        return hostname

    if hostname is None:
        hostname = get_global("hostname")

    # Find a match
    for name, node in NODE_DESCRIPTORS.items():

        if fnmatch.fnmatch(hostname, node.hostname_pattern):
            config = node
            break
    else:
        config = NodeDescriptor(
            name="default", hostname_pattern="*", memory=get_global("memory"), ncores=get_global("ncores")
        )