code: def _init_params(self):
          
          assert self._kv_initialized, "Cannot initialize parameters in KVStore " \
                                       "when KVStore is not initialized."
          params_to_init = []
          if self._kvstore:
              for param in self._params_to_init:
                  if param._deferred_init:
                      params_to_init.append(param)
                  else:
                      param_arrays = param._check_and_get(param._data, list)
                      idx = self._param2idx[param.name]
                      self._kvstore.init(idx, param_arrays[0])
                      if param._stype == 'default':
                          self._kvstore.pull(idx, param_arrays, priority=-idx)
  
          self._params_to_init = params_to_init
docs: Initialize parameters in the KVStore.
  
          Parameters with incomplete initialization are ignored.