Seems it’s the same topic as another thread where we are helping on debugging:

  
    
    
    Quantization Error During Concat -- RuntimeError: Didn't find kernel to dispatch to for operator 'aten::_cat' quantization
  
  
    thanks @hx89 , if you could post that example for compare module level quantization error - It would be great  
In the meantime, I tried the histogram observer and the result is still pretty bad   
[image] 
any other suggestions ?