code: def test_flat_accuracy():
      score = metrics.flat_accuracy_score(y1, y2)
      assert score == 3 / 5
  
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 1 for calling a global function with example usage: test_flat_accuracy() without return types