code: def setUp(self):
      steps = 2
      phases = [
          Phase(lr=linspace(1, 1, steps)),
          Phase(lr=linspace(0, 0, steps)),
      ]
      self.policy = OptimizerPolicy(phases)
  
imports: import unittest
  from poutyne import OptimizerPolicy, Phase, cosinespace, linspace, one_cycle_phases, sgdr_phases
label_desc: Use image node_id 1 for calling the TestOptimizerPolicy obj's underlying member method code with example usage: obj.setUp() without return types