class_docstr: A class that tracks a list of trackable objects.
class_docstr_tok: ["A","class","that","tracks","a","list","of","trackable","objects","."]
code: def __init__(self):
      self._trackable_objects = []
  
file_path: transform/tensorflow_transform/annotators.py
imports: import contextlib
  import os
  from typing import Callable, List, Optional
  import tensorflow
  from tensorflow_transform.graph_context import TFGraphContext
  from tensorflow_transform.keras_lib import tf_keras
  from tensorflow.python.trackable import base
label_desc: Use image node_id 1 to create a new ObjectTracker object  with example: obj = ObjectTracker()