mxnet_embedding_server.ipynb failed CI

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

Error:

---------------------------------------------------------------------------
Exception encountered at "In [15]":
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
in
2 predictor = sagemaker.predictor.RealTimePredictor(
3 endpoint=endpoint_key,
----> 4 content_type='image/jpeg')

/usr/local/lib/python3.7/site-packages/sagemaker/deprecations.py in __init__(self, *args, **kwargs)
170 """Provides a warning for the class name."""
171 renamed_warning(f"The class {name}")
--> 172 super(DeprecatedClass, self).__init__(*args, **kwargs)
173
174 return DeprecatedClass

TypeError: __init__() missing 1 required positional argument: 'endpoint_name'

Open sagemaker-python-sdk/mxnet_gluon_embedding_server/mxnet_embedding_server.ipynb and inspect cell In [15], where RealTimePredictor is constructed. Reproduce the notebook or its CI check to confirm the endpoint-related TypeError, then verify that the notebook runs successfully and the CI failure is resolved.

Written by the indexing model from the issue text.