code: def test_reference_no_pointy() -> None:
      reference = np.array([10, 10])
      hv = HypervolumeIndicator(reference)
      front = np.array(
          [
              (11, 9),
              (9, 11),
          ]
      )
      volume = hv.compute(front)
      assert volume == -3
  
file_path: nevergrad/nevergrad/optimization/multiobjective/test_hypervolume.py
imports: import numpy
  from .hypervolume import VectorNode, VectorLinkedList, HypervolumeIndicator
label_desc: Use image node_id 15 for calling a global function with example usage: test_reference_no_pointy() without return types