tensorflow_serving_container.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/sagemaker-python-sdk/tensorflow_serving_container/tensorflow_serving_container.ipynb

Error:

---------------------------------------------------------------------------
Exception encountered at "In [3]":
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
in
----> 1 import sample_utils
2
3 model_name = 'mobilenet_v2_140_224'
4 export_path = 'mobilenet'
5 model_path = sample_utils.tfhub_to_savedmodel(model_name, export_path)

/opt/ml/processing/input/sample_utils.py in
2 import tensorflow_hub as hub
3 import numpy as np
----> 4 import cv2
5
6

/usr/local/lib/python3.7/site-packages/cv2/__init__.py in
3 import sys
4
----> 5 from .cv2 import *
6 from .data import *
7

ImportError: libGL.so.1: cannot open shared object file: No such file or directory

Start with sagemaker-python-sdk/tensorflow_serving_container/tensorflow_serving_container.ipynb and the sample_utils.py import shown in the traceback. Reproduce the CI failure and investigate why cv2 cannot find libGL.so.1. Done means the notebook's CI run completes without the OpenCV import error.

Written by the indexing model from the issue text.