human
Complete the below
def _internal_register_modality(name, mod_collection, collection_str):

    ''''Register a modality into mod_collection.'
    '''
assistant
#Here is the Python code you requested.
    def decorator(mod_cls, registration_name=None):
        'Registers    &    returns    mod_cls    with    registration_name    or    default    name.'
        mod_name = (registration_name or _default_name(mod_cls))
        if (mod_name in mod_collection):
            raise ValueError(('%s    modality    %s    already    registered.' % (collection_str, mod_name)))
        mod_collection[mod_name] = mod_cls
        return mod_cls
    if callable(name):
        mod_cls = name
        return decorator(mod_cls, registration_name=_default_name(mod_cls))
    return (lambda mod_cls: decorator(mod_cls, name))