code: def setUp(self):
      # Epsilon is used to compare numerical gradient to analytical one
      self.epsilon = 1e-4
  
      # Delta is tolerance for testing inverse, f(f^{-1}(x)) = x
      self.delta = 1e-6
  
imports: import operator
  from functools import partial, reduce
  from unittest import TestCase
  import pytest
  import torch
  import pyro.distributions
  import pyro.distributions.transforms
  from pyro.distributions import constraints
  from tests.common import assert_close
label_desc: Use image node_id 1 for calling the TransformTests obj's underlying member method code with example usage: obj.setUp() without return types