code: def __reduce__(self):
      # this approach is necessary because __setstate__ is called after
      # __setitem__ upon unpickling and since __init__ is not called there
      # is no shape attribute hence it is not possible to unpickle it.
      return dict.__reduce__(self)
  
imports: import itertools
  import numpy
  from ._matrix import spmatrix
  from ._base import _spbase, sparray, issparse
  from ._index import IndexMixin
  from ._sputils import isdense, getdtype, isshape, isintlike, isscalarlike, upcast, upcast_scalar, check_shape
label_desc: Use image node_id 37 for calling the _dok_base obj's underlying member method code with example usage: obj.__reduce__() and returns: dict