code: def test_plot_vars(self):
      hyperopt.plotting.main_plot_vars(self.trials, self.domain)
  
file_path: hyperopt/hyperopt/tests/unit/test_plotting.py
imports: import unittest
  import os
  from hyperopt import Trials
  import hyperopt.plotting
  from hyperopt import rand, fmin
  from .test_domains import many_dists
label_desc: Use image node_id 4 for calling the TestPlotting obj's underlying member method code with example usage: obj.test_plot_vars() without return types