code: def test_exception_is_thrown_on_optimizer_argument(self):
      with self.assertRaises(ValueError):
          StepLR(self.optimizer, step_size=3)
  
file_path: poutyne/tests/framework/callbacks/test_lr_scheduler.py
imports: import unittest
  from unittest import TestCase
  import torch
  import torch.nn
  from poutyne import CosineAnnealingLR, ExponentialLR, LambdaLR, Model, MultiStepLR, ReduceLROnPlateau, StepLR
  from tests.framework.tools import some_data_generator
label_desc: Use image node_id 9 for calling the LRSchedulersTest obj's underlying member method code with example usage: obj.test_exception_is_thrown_on_optimizer_argument() without return types