code: def test_known_tags(self, pipeline):
      assert pipeline.processors["ner"].get_known_tags() == ["DISEASE"]
      assert len(pipeline.processors["ner"].get_known_tags(1)) == 18
  
file_path: stanza/stanza/tests/pipeline/test_pipeline_ner_processor.py
imports: import pytest
  import stanza
  from stanza.utils.conll import CoNLL
  from stanza.models.common.doc import Document
  from stanza.tests import *
label_desc: Use image node_id 4 for calling the TestMultiNERProcessor obj's underlying member method code with example usage: obj.test_known_tags(pipeline) without return types