code: def _pseudo_step_pair(self, param_groups):
      for p in self._generate_params(param_groups):
          p.data[1][1] = 3
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import copy
  import unittest
  import torch
  from pytext.optimizer import fp16_optimizer
  from torch.autograd import Variable
label_desc: Use image node_id 24 for calling the TestFp16Optimizer obj's underlying member method code with example usage: obj._pseudo_step_pair(param_groups) without return types