code: def setUpClass(cls):
      cls.alpha = 0.2
  
      cls.vmin = 0
      cls.vmax = 10
  
file_path: TensorLayer/tests/test_activations.py
imports: import os
  import unittest
  import numpy
  import tensorlayer
  from tests.utils import CustomTestCase
label_desc: Use image node_id 1 for calling the Test_Leaky_ReLUs obj's underlying member method code with example usage: obj.setUpClass(cls) without return types