code: def test_run_and_save_plot(self):
      matplotlib.use("Agg")
      try:
          self.trainer.run()
      finally:
          os.remove(os.path.join(self.trainer.out, self.filename))
  
file_path: chainer/tests/chainer_tests/training_tests/extensions_tests/test_variable_statistics_plot.py
imports: import os
  import unittest
  import numpy
  import six
  import chainer
  from chainer import testing
  from chainer.training import extensions
label_desc: Use image node_id 2 for calling the TestVariableStatisticsPlot obj's underlying member method code with example usage: obj.test_run_and_save_plot() without return types