code: def get_labels(self):
      return self.labels[self.iter]
  
file_path: torch-points3d/test/test_shapenetparttracker.py
imports: import unittest
  import numpy
  import os
  import sys
  from torch_points3d.metrics.shapenet_part_tracker import ShapenetPartTracker
label_desc: Use image node_id 3 for calling the MockModel obj's underlying member method code with example usage: obj.get_labels() and returns: self