code: def load_vtk_streamlines(filename, to_lps=True):
      """Load streamlines from vtk polydata.
  
      Load formats can be VTK, FIB
  
      Parameters
      ----------
      filename : string
          input filename (.vtk or .fib)
      to_lps : bool
          Default to True, will follow the vtk file convention for streamlines
          Will be supported by MITKDiffusion and MI-Brain
  
      Returns
      -------
      output :  list
           list of 2D arrays
  
      """
      polydata = load_polydata(filename)
      lines = fury.utils.get_polydata_lines(polydata)
      if to_lps:
          to_lps = np.eye(4)
          to_lps[0, 0] = -1
          to_lps[1, 1] = -1
          return transform_streamlines(lines, to_lps)
  
      return lines
  
imports: import numpy
  from dipy.tracking.streamline import transform_streamlines
  from dipy.utils.optpkg import optional_package
label_desc: Use image node_id 4 for calling a global function with example usage: load_vtk_streamlines(filename, to_lps) and returns: lines, transform_streamlines