" Input: { (cmd_key) - local-mnist, local-mnist-attack or local-cifar10 (aggregator) - if not specified, use the list of ['averaged-median', 'krum-co', 'krum-py', 'average', 'median', 'krum-tf', 'average-nan', 'bulyan-co', 'bulyan-py'] } Output: { return - return code = 0, if successful > 0, if error (error) - error text if return > 0 } "