code: def test_set_model_to_eval_mode(mocker, model):
      mocker.spy(model, "eval")
      Backprop(model)
  
      model.eval.assert_called_once()
  
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 7 for calling a global function with example usage: test_set_model_to_eval_mode(mocker, model) without return types