def groups_option(f):
    new_func = click.option("-g", "--groups",
                            help="Comma-separated list of requirement groups "
                            "to include.")(f)
    return update_wrapper(new_func, f)
def deeplift_tensor_grad(grad):
    return_grad = complex_module_gradients[-1]
    del complex_module_gradients[-1]
    return return_grad