code: def _set_state_impl(self, key, param):
      pass
  
imports: from six import iteritems
  import nnabla
  import nnabla.solvers
  from nnabla.testing import assert_allclose
  import numpy
  from collections import OrderedDict
  import os
label_desc: Use image node_id 3 for calling the RefSolver obj's underlying member method code with example usage: obj._set_state_impl(key, param) without return types