code: def test_average_combiner(create_pool_classifiers):
      query = np.array([[1, -1]])
      ensemble_classifiers = create_pool_classifiers
      expected = 0
      result = average_combiner(ensemble_classifiers, query)
      assert result == expected
  
imports: import pytest
  from deslib.util.aggregation import *
  from ..conftest import create_base_classifier
label_desc: Use image node_id 8 for calling a global function with example usage: test_average_combiner(create_pool_classifiers) without return types