code: def test_tuple_keys():
      parameter_dict = {
          ("a", "b"): torch.nn.Parameter(torch.randn(16, 16)),
          ("a.b", "c"): torch.nn.Parameter(torch.randn(8, 8)),
      }
      parameter_dict = ParameterDict(parameter_dict)
  
      expected_keys = {("a", "b"), ("a.b", "c")}
      assert set(parameter_dict.keys()) == expected_keys
      assert (
          set([key for key, _ in parameter_dict.items()])
          == expected_keys
      )
  
      for key in expected_keys:
          assert key in parameter_dict
  
      del parameter_dict["a", "b"]
      assert ("a", "b") not in parameter_dict
  
imports: import torch
  from torch_geometric.nn.parameter_dict import ParameterDict
label_desc: Use image node_id 3 for calling a global function with example usage: test_tuple_keys() without return types