code: def gen_file_prefix(is_row_based=True, auto_id=True, prefix=""):
      if is_row_based:
          if auto_id:
              return f"{prefix}_row_auto"
          else:
              return f"{prefix}_row_cust"
      else:
          if auto_id:
              return f"{prefix}_col_auto"
          else:
              return f"{prefix}_col_cust"
  
imports: import copy
  import json
  import os
  import time
  import numpy
  import pandas
  import random
  from faker import Faker
  from sklearn import preprocessing
  from common.common_func import gen_unique_str
  from common.minio_comm import copy_files_to_minio
  from utils.util_log import test_log
label_desc: Use image node_id 1 for calling a global function with example usage: gen_file_prefix(is_row_based, auto_id, prefix) and returns: prefix, str, prefix, str, prefix, str, prefix, str