def get_registered_layer(name):
    """
    Args:
        name (str): the name of the layer, e.g. 'Conv2D'
    Returns:
        the wrapped layer function, or None if not registered.
    """
    ret = _LAYER_REGISTRY.get(name, None)
    if ret == _NameConflict:
        raise KeyError("Layer named '{}' is registered with `@layer_register` more than once!".format(name))
    return ret