def METHOD_NAME():
    '''
    Get the data set target, and categorical and metric feature field names.
    '''
    result = {}
    for dataset_name in args.datasets:
        if download_dataset(dataset_name):
            fields = feature_fields(dataset_name)
            if fields != None:
                result[dataset_name] = fields
        else:
            print('Missing dataset', dataset_name)
    return result