code: def test_coefficient_correlation(example_diversity):
      (
          y_pred_classifier1,
          y_pred_classifier2,
          y_real,
          y_ex1,
      ) = example_diversity
      coefficient = correlation_coefficient(
          y_real, y_pred_classifier1, y_pred_classifier2
      )
      assert np.isclose(coefficient, 0.0).all()
  
file_path: DESlib/deslib/tests/util/test_diversity_batch.py
imports: import numpy
  import pytest
  from deslib.util.diversity_batch import _process_predictions, double_fault, Q_statistic, ratio_errors, agreement_measure, disagreement_measure, correlation_coefficient
label_desc: Use image node_id 11 for calling a global function with example usage: test_coefficient_correlation(example_diversity) without return types