code: def vtk_output(obj):
      """Configure the input data for vtk pipeline object obj."""
      if vtk_old():
          return obj.output
      return obj.get_output()
  
file_path: nipype/nipype/interfaces/vtkbase.py
imports: import os
  from ..None import logging
label_desc: Use image node_id 6 for calling a global function with example usage: vtk_output(obj) and returns: obj, obj