class_docstr: Converts MRtrix (.tck) tract files into TrackVis (.trk) format
  using functions from dipy
  Example
  -------
  >>> import nipype.interfaces.mrtrix as mrt
  >>> tck2trk = mrt.MRTrix2TrackVis()
  >>> tck2trk.inputs.in_file = 'dwi_CSD_tracked.tck'
  >>> tck2trk.inputs.image_file = 'diffusion.nii'
  >>> tck2trk.run()                                   # doctest: +SKIP
code: def _gen_outfilename(self):
      _, name, _ = split_filename(self.inputs.in_file)
      return name + ".trk"
  
imports: import os.path
  import nibabel
  import numpy
  from nibabel.volumeutils import native_code
  from nibabel.orientations import aff2axcodes
  from ...None import logging
  from ...utils.filemanip import split_filename
  from ..base import TraitedSpec, File, isdefined
  from ..dipy.base import DipyBaseInterface, HAVE_DIPY
label_desc: Use image node_id 4 for calling the MRTrix2TrackVis obj's underlying member method code with example usage: obj._gen_outfilename() and returns: unknown