code: def proj_transform_clip(xs, ys, zs, M):
      """
      Transform the points by the projection matrix
      and return the clipping result
      returns txs,tys,tzs,tis
      """
      vec = vec_pad_ones(xs, ys, zs)
      return proj_transform_vec_clip(vec, M)
  
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 14 for calling a global function with example usage: proj_transform_clip(xs, ys, zs, M) and returns: proj_transform_vec_clip