code: def test_swith_graph_backend_global(self):
      import deepsnap
  
      self.assertTrue(isinstance(deepsnap._netlib, type(sx)))
      import networkx as nx
  
      deepsnap.use(nx)
      self.assertTrue(isinstance(deepsnap._netlib, type(nx)))
      deepsnap.use(sx)
      self.assertTrue(isinstance(deepsnap._netlib, type(sx)))
  
file_path: deepsnap/tests/test_graph_backend.py
imports: import snap
  import snapx
  import unittest
  import torch
  import networkx
  from torch.utils.data import DataLoader
  from torch_geometric.datasets import Planetoid
  from deepsnap.graph import Graph
  from deepsnap.batch import Batch
  from deepsnap.dataset import GraphDataset
label_desc: Use image node_id 1 for calling the TestGraphBackend obj's underlying member method code with example usage: obj.test_swith_graph_backend_global() without return types