code: def setUp(self):
      self.xs = [
          numpy.random.uniform(-1, 1, self.shape) for i in range(self.n)
      ]
  
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 1 for calling the TestReservoir obj's underlying member method code with example usage: obj.setUp() without return types