code: def test_large_messages_map():
      x = {i: "mystring_%d" % i for i in range(100_000)}
      b = dumps(x)
      x2 = loads(b)
      assert x == x2
  
imports: from __future__ import annotations
  import sys
  import pytest
  from dask.sizeof import sizeof
  from distributed.compatibility import WINDOWS
  from distributed.protocol import dumps, loads, msgpack, to_serialize
  from distributed.protocol.cuda import cuda_deserialize, cuda_serialize
  from distributed.protocol.serialize import Pickled, Serialize, Serialized, ToPickle, dask_deserialize, dask_serialize, deserialize, serialize
  from distributed.utils import nbytes
  from distributed.utils_test import captured_logger
label_desc: Use image node_id 5 for calling a global function with example usage: test_large_messages_map() without return types