code: def test_lemmatizer_requires_labels():
      nlp = English()
      nlp.add_pipe("trainable_lemmatizer")
      with pytest.raises(ValueError):
          nlp.initialize()
  
imports: import pickle
  import hypothesis.strategies
  import pytest
  from hypothesis import given
  from spacy import util
  from spacy.lang.en import English
  from spacy.language import Language
  from spacy.pipeline._edit_tree_internals.edit_trees import EditTrees
  from spacy.strings import StringStore
  from spacy.training import Example
  from spacy.util import make_tempdir
label_desc: Use image node_id 6 for calling a global function with example usage: test_lemmatizer_requires_labels() without return types