code: def test_len(self) -> None:
      self.assertEqual(
          len(
              EdgeList(
                  EntityList.from_tensor(
                      torch.tensor([3, 4], dtype=torch.long)
                  ),
                  EntityList.from_tensor(
                      torch.tensor([0, 2], dtype=torch.long)
                  ),
                  torch.tensor([2, 0], dtype=torch.long),
              )
          ),
          2,
      )
  
imports: from unittest import main, TestCase
  import torch
  from torchbiggraph.edgelist import EdgeList
  from torchbiggraph.entitylist import EntityList
label_desc: Use image node_id 12 for calling the TestEdgeList obj's underlying member method code with example usage: obj.test_len() without return types