code: def _partition_space(self):
      pass
  
imports: from __future__ import annotations
  from itertools import product
  from unittest import mock
  import torch
  from botorch.exceptions.errors import BotorchError
  from botorch.utils.multi_objective.box_decompositions.box_decomposition import BoxDecomposition, FastPartitioning
  from botorch.utils.multi_objective.box_decompositions.dominated import DominatedPartitioning
  from botorch.utils.multi_objective.box_decompositions.non_dominated import FastNondominatedPartitioning, NondominatedPartitioning
  from botorch.utils.multi_objective.box_decompositions.utils import update_local_upper_bounds_incremental
  from botorch.utils.testing import BotorchTestCase
label_desc: Use image node_id 1 for calling the DummyBoxDecomposition obj's underlying member method code with example usage: obj._partition_space() without return types