I think he his talking about our label_map_utils.py in model garden:

  

      github.com
  

  
    tensorflow/models/blob/master/research/object_detection/utils/label_map_util.py 2


    # Copyright 2017 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Label map utility functions."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function




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As you can see in this section and in the next one:
https://tensorflow-object-detection-api-tutorial.readthedocs.io/en/latest/training.html#create-label-map 1