code: def _load_track_estimates(track, estimates_dir, output_dir):
      
      user_results = {}
      track_estimate_dir = os.path.join(
          estimates_dir,
          track.subset,
          track.name
      )
      for target in glob.glob(
          track_estimate_dir + '/*.wav'
      ):
  
          target_name = op.splitext(
              os.path.basename(target)
          )[0]
          try:
              target_audio, _ = sf.read(
                  target,
                  always_2d=True
              )
              user_results[target_name] = target_audio
          except RuntimeError:
              pass
  
      if user_results:
          eval_mus_track(
              track,
              user_results,
              output_dir=output_dir
          )
  
      return None
docs: load estimates from disk instead of processing