code: def test_optimizer(self, optimizer_constructor):
      self._test_basic_cases(*optimizer_constructor)
  
file_path: pytorch-optimizer/tests/test_optimizer.py
imports: import functools
  from copy import deepcopy
  import torch
  from torch.autograd import Variable
  from torch.optim.lr_scheduler import ExponentialLR, ReduceLROnPlateau, StepLR
  import torch_optimizer
label_desc: Use image node_id 4 for calling the TestOptim obj's underlying member method code with example usage: obj.test_optimizer(optimizer_constructor) without return types