I met the same issue, and found the answer here:

  
      github.com/pytorch/vision
  
  
    
  
	  
  

  
    
      engine.py error while following tutorial 103
    

    
      
        opened 
        
          
        
        Apr 30, 2020
      
      

        
          closed 
        
          
        
        Apr 30, 2020
      
        

      
        
          
          EMCP
        
      
    
  



  📚 Documentation
I have found this library via the examples at https://pytorch.org/tutorials/intermediate/torchvision_tutorial.html
I ran the google colab and that successfully finished.. however when...



    module: models
    module: reference scripts
    question
    topic: object detection