msaf: global name 'ds_name' is not defined

Hi i first install msaf and catch error

NameError                                 Traceback (most recent call last)
<ipython-input-13-1b3d08e88056> in <module>()
      2 # Set plot = True to plot the results
      3 boundaries, labels = msaf.process(audio_file, boundaries_id="foote", 
----> 4                                   labels_id="fmc2d", plot=True)

/home/rustam/anaconda2/lib/python2.7/site-packages/msaf/run.pyc in process(in_path, annot_beats, feature, framesync, boundaries_id, labels_id, hier, sonify_bounds, plot, n_jobs, annotator_id, config, out_bounds, out_sr)
    345         if plot:
    346             plotting.plot_one_track(file_struct, est_times, est_labels,
--> 347                                     boundaries_id, labels_id, ds_name)
    348 
    349         # Save estimations

NameError: global name 'ds_name' is not defined

conda python (2.7) ubuntu 16 msaf install with pip (msaf-0.1.0-py2-none-any.whl) run this example https://github.com/urinieto/msaf/blob/master/examples/compute_features.py