code: def model_grayscale():
      return CnnGrayscale()
  
imports: import inspect
  import pytest
  import torch
  import torch.nn
  import torch.nn.functional
  import torchvision.models
  from flashtorch.saliency import Backprop
label_desc: Use image node_id 6 for calling a global function with example usage: model_grayscale() and returns: CnnGrayscale