text: Q:
  
  ValueError in sklearn: shapes not aligned
  
  I am attempting to return the test scores I ran through my program, but no matter what I try, I keep getting the error 
  ValueError                                Traceback (most recent call last)
  <ipython-input-19-4b49cb58c813> in <module>()
  ----> 1 print(model_final.score(X_train, y_train))
        2 print(model_final.score(X_test, y_test))
  
  3 frames
  /usr/local/lib/python3.6/dist-packages/sklearn/utils/extmath.py in safe_sparse_dot(a, b, dense_output)
      140         return ret
      141     else:
  --> 142         return np.dot(a, b)
      143 
      144 
  
  ValueError: shapes (353,10) and (172,) not aligned: 10 (dim 1) != 172 (dim 0)
  
  The full code can be found here.
  Any help would be appreciated, and thank you in advance.
  
  A:
  
  The issue is in the line
  model_final = model
  
  This statement will not create a replica of model, it just does a shallow copy so when you change your model even the model_final will get changed. To avoid this you need to do a deepcopy as
  from copy import deepcopy
  model_final = deepcopy(model)
  
  this will do a deep copy and whatever changes you make to model will not affect model_final.
  Hope this helps!
  
  