code: def inv_transform(xs, ys, zs, M):
      iM = linalg.inv(M)
      vec = vec_pad_ones(xs, ys, zs)
      vecr = np.dot(iM, vec)
      try:
          vecr = vecr / vecr[3]
      except OverflowError:
          pass
      return vecr[0], vecr[1], vecr[2]
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  from six.moves import zip
  import numpy
  import numpy.linalg
label_desc: Use image node_id 11 for calling a global function with example usage: inv_transform(xs, ys, zs, M) and returns: vecr,  vecr,  vecr