code: def exact_match():
      """Change points with exact match."""
      change_points = list(range(5))
      return change_points, change_points
  
file_path: sktime/sktime/performance_metrics/tests/test_segmentation_metrics.py
imports: import pytest
  from sktime.performance_metrics.annotation.metrics import count_error, hausdorff_error, prediction_ratio
label_desc: Use image node_id 1 for calling a global function with example usage: exact_match() and returns: change_points,  change_points