code: def test_multivariate(self):
      self._multi_setup()
      self._test_forecast()
  
file_path: merlion/tests/forecast/test_ets.py
imports: import logging
  from os.path import abspath, dirname, join
  import sys
  import unittest
  import pandas
  import numpy
  from merlion.evaluate.forecast import ForecastMetric
  from merlion.models.forecast.ets import ETSConfig, ETS
  from merlion.utils.time_series import TimeSeries, to_pd_datetime
label_desc: Use image node_id 4 for calling the TestETS obj's underlying member method code with example usage: obj.test_multivariate() without return types