code: def clone_releases(tag=None):
      """
      Clone the releases in tmprelease_date
      """
      os.system("rm -rf tmp")
      os.system("mkdir tmp")
      for package in packages:
          print(package, packages[package])
          if tag:
              branch = tag
          else:
              branch = packages[package]
          pkgstr = (
              f"git clone --branch {branch}"
              f" https://github.com/pysal/{package}.git"
              f" tmp/{package}"
          )
          print(pkgstr)
          os.system(pkgstr)
  
imports: import os
  import json
  import urllib
  import re
  import yaml
  from urllib.request import urlopen
  from datetime import datetime, timedelta
  import requests
label_desc: Use image node_id 6 for calling a global function with example usage: clone_releases(tag) without return types