def get_fusion_options(defaults=None):
    """Adding arguments for the fusion subcommand

    """
    if defaults is None:
        defaults = {}
    options = {'--fusion-models': {'action': 'store', 'dest':
        'fusion_models', 'default': defaults.get('fusion_models', None),
        'help':
        'Comma-separated list of models to be included in the Fusion resource.'
        }, '--fusion-models-file': {'action': 'store', 'dest':
        'fusion_models_file', 'default': defaults.get('fusion_models_file',
        None), 'help':
        'Path to a JSON file that contains a list of model IDs or maps to include in the Fusion resource.'
        }, '--fusion': {'action': 'store', 'dest': 'fusion', 'default':
        defaults.get('fusion', None), 'help': 'BigML Fusion Id.'},
        '--fusions': {'action': 'store', 'dest': 'fusions', 'default':
        defaults.get('fusions', None), 'help':
        'Path to a file containing fusion/ids. One Fusion per line (e.g., fusion/50a206a8035d0706dc000376).'
        }, '--fusion-file': {'action': 'store', 'dest': 'fusion_file',
        'default': defaults.get('fusion_file', None), 'help':
        'BigML Fusion JSON structure file.'}, '--fusion-attributes': {
        'action': 'store', 'dest': 'fusion_attributes', 'default': defaults
        .get('fusion_attributes', None), 'help':
        'Path to a json file describing Fusion attributes.'}}
    return options
