code: def create_mean(self):
      return ZeroMean()
  
imports: import unittest
  from gpytorch.means import ZeroMean
  from gpytorch.test.base_mean_test_case import BaseMeanTestCase
label_desc: Use image node_id 1 for calling the TestZeroMean obj's underlying member method code with example usage: obj.create_mean() and returns: ZeroMean