code: def test_empty_batch():
      multi_view_collate = MultiViewCollate()
      batch = []
      views, labels, fnames = multi_view_collate(batch)
      assert len(views) == 0
      assert len(labels) == 0
      assert len(fnames) == 0
  
file_path: lightly/tests/data/test_multi_view_collate.py
imports: from typing import List, Tuple, Union
  from warnings import warn
  import torch
  from torch import Tensor
  from lightly.data.multi_view_collate import MultiViewCollate
label_desc: Use image node_id 1 for calling a global function with example usage: test_empty_batch() without return types