code: def wiki_tet_vol(d, a, b, c):
      # Wikipedia formula for generalized tetrahedron volume
      d, a, b, c = (np.array(e) for e in (d, a, b, c))
      cp = np.cross((b - d), (c - d))
      v2t6 = np.dot((a - d), cp)
      return np.sqrt(v2t6) / 6.0
  
imports: from itertools import combinations
  import numpy
  import numpy.linalg
  import pytest
  from numpy.testing import assert_almost_equal, assert_array_equal
  from ..None import intvol
label_desc: Use image node_id 9 for calling a global function with example usage: wiki_tet_vol(d, a, b, c) and returns: unknown