code: def get_authentication():
      return Authentication(api_key=Accounts.DEFAULT_API_KEY)
  
imports: import copy
  import pytest
  import shutil
  import tempfile
  from helm.common.authentication import Authentication
  from helm.common.request import Request
  from helm.proxy.accounts import AuthenticationError, Accounts
  from helm.proxy.query import Query
  from .server_service import ServerService
label_desc: Use image node_id 1 for calling a global function with example usage: get_authentication() and returns: Authentication