code: def test_sequence_accuracy():
      assert metrics.sequence_accuracy_score(y1, y2) == 0
      assert metrics.sequence_accuracy_score([], []) == 0
      assert (
          metrics.sequence_accuracy_score(
              [[1, 2], [3], [4]], [[1, 2], [4], [4]]
          )
          == 2 / 3
      )
      assert (
          metrics.sequence_accuracy_score([[1, 2], [3]], [[1, 2], [3]])
          == 1.0
      )
  
file_path: sklearn-crfsuite/tests/test_metrics.py
imports: from __future__ import absolute_import, division
  import pytest
  from sklearn_crfsuite import metrics
label_desc: Use image node_id 6 for calling a global function with example usage: test_sequence_accuracy() without return types