code: def test_offload_state_dict(self):
      model = ModelForTest()
      with TemporaryDirectory() as tmp_dir:
          offload_state_dict(tmp_dir, model.state_dict())
          index_file = os.path.join(tmp_dir, "index.json")
          self.assertTrue(os.path.isfile(index_file))
          # TODO: add tests on what is inside the index
  
          for key in [
              "linear1.weight",
              "linear1.bias",
              "linear2.weight",
              "linear2.bias",
          ]:
              weight_file = os.path.join(tmp_dir, f"{key}.dat")
              self.assertTrue(os.path.isfile(weight_file))
  
file_path: accelerate/tests/test_offload.py
imports: import os
  import unittest
  from tempfile import TemporaryDirectory
  import torch
  import torch.nn
  from accelerate.utils import OffloadedWeightsLoader, extract_submodules_state_dict, load_offloaded_weight, offload_state_dict, offload_weight
label_desc: Use image node_id 1 for calling the OffloadTester obj's underlying member method code with example usage: obj.test_offload_state_dict() without return types