code: def cal_num_of_configs(packages, cuda_version):
      """Calculates how many different version configurations are available for given
      packages and cuda version"""
      ret = 1
      for pckg in all_packages:
          if pckg.key in packages:
              ret *= pckg.get_num_of_version(cuda_version)
      return ret
  
imports: import argparse
  import sys
  from pip._vendor.packaging.version import parse
  import urllib.parse
  from urllib.request import urlopen, HTTPError, Request, URLError
label_desc: Use image node_id 2 for calling a global function with example usage: cal_num_of_configs(packages, cuda_version) and returns: ret