code: def test_invalid_layer_str(g_ascent):
      with pytest.raises(TypeError):
          g_ascent.optimize("first", 0, num_iter=2)
  
imports: import inspect
  import pytest
  from os import path
  import numpy
  import torchvision.models
  from flashtorch.activmax import GradientAscent
  from flashtorch.utils import apply_transforms
label_desc: Use image node_id 8 for calling a global function with example usage: test_invalid_layer_str(g_ascent) without return types