code: def chunkstore_lib(arctic, chunkstore_name):
      from arctic import CHUNK_STORE
  
      arctic.initialize_library(chunkstore_name, lib_type=CHUNK_STORE)
      return arctic.get_library(chunkstore_name)
  
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 9 for calling a global function with example usage: chunkstore_lib(arctic, chunkstore_name) and returns: arctic