code: def _company_with_emps_machines_fixture(self):
      fixture = self._company_with_emps_fixture()
      fixture[0].employees[0].machines = [
          Machine(name="IBM ThinkPad"),
          Machine(name="IPhone"),
      ]
      fixture[0].employees[1].machines = [Machine(name="Commodore 64")]
      return fixture
  
imports: from sqlalchemy import ForeignKey
  from sqlalchemy import Integer
  from sqlalchemy import String
  from sqlalchemy import util
  from sqlalchemy.orm import polymorphic_union
  from sqlalchemy.orm import relationship
  from sqlalchemy.orm import sessionmaker
  from sqlalchemy.sql.selectable import LABEL_STYLE_TABLENAME_PLUS_COL
  from sqlalchemy.testing import AssertsCompiledSQL
  from sqlalchemy.testing import config
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing.entities import ComparableEntity
  from sqlalchemy.testing.schema import Column
  from sqlalchemy.testing.schema import Table
label_desc: Use image node_id 4 for calling the _PolymorphicFixtureBase obj's underlying member method code with example usage: obj._company_with_emps_machines_fixture() and returns: fixture