code: def _generate_tetrahedron():
      return np.array(
          [[1, 1, 1], [1, -1, -1], [-1, 1, -1], [-1, -1, 1]]
      )
  
imports: import pytest
  import numpy
  from numpy.testing import assert_array_almost_equal
  from scipy.spatial.transform import Rotation
  from scipy.optimize import linear_sum_assignment
  from scipy.spatial.distance import cdist
  from scipy.constants import golden
  from scipy.spatial import cKDTree
label_desc: Use image node_id 6 for calling a global function with example usage: _generate_tetrahedron() and returns: np