Saving a model in Scikit-Learn?

Question

I am trying to save and load the scikit-learn model, but having problems saving and loading in different versions of python. Here is what I tried:

• Using pickle to save the model in python3 and deserialize in python2. This works for some models like LR, SVM, but it does not work for KNN.

  >>> pickle.load(open("inPy3.pkl", 'rb')) #KNN model ValueError: non-string names in Numpy dtype unpickling 

• Also, I tried serializing and deserializing in json using jsonpickle, but getting the following error.

   data = jsonpickle.encode(lr) #lr = logisticRegression Model jsonpickle.decode(data) AttributeError: 'dict' object has no attribute '__name__' 

In addition, I want to know if there is any utility that I can use to serialize and deserialize objects of the scikit-learn model for a human-readable format (json, xml, protobuf, etc.).