docstr: Use str to store Nones. Used for HDF5
docstr_tok: ["Use","str","to","store","Nones",".","Used","for","HDF5"]
code: def _none_to_str(mp):
      """Use str to store Nones. Used for HDF5"""
      for k in mp.keys():
          if mp[k] is None:
              mp[k] = "None"
  
      return mp
  
imports: from abc import ABCMeta, abstractmethod
  from sklearn.exceptions import NotFittedError
  from sklearn.base import BaseEstimator
  import json
  import pickle
  import numpy
  from warnings import warn
label_desc: Use image node_id 4 for calling the BaseModelPackage obj's underlying member method code with example usage: obj._none_to_str(mp) and returns: mp