code: def arctic(mongo_server_module):
      from arctic import Arctic
  
      disable_arctic_cache(mongo_server_module.api)
      mongo_server_module.api.drop_database("arctic")
      mongo_server_module.api.drop_database(
          "arctic_{}".format(getpass.getuser())
      )
      return Arctic(mongo_server_module.api)
  
imports: import getpass
  import os
  import random
  import string
  import unittest
  import numpy
  import pandas
  import pytest
  from pandas.tseries.offsets import Day
  from past.utils import old_div
  from six import PY3
label_desc: Use image node_id 2 for calling a global function with example usage: arctic(mongo_server_module) and returns: Arctic