TQDMProgressBar: Cannot register a class that does not have a get_config() method.

[Squadrick]

System information

• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Ubuntu 18.04
• TensorFlow version and how it was installed (source or binary): 2.1.0-dev20191029
• TensorFlow-Addons version and how it was installed (source or binary): master
• Python version: 3.6.8
• Is GPU used? (yes/no): no

Describe the bug

TQDMProgressBar doesn't implement get_config().

Code to reproduce the issue

Fails on import:

import tensorflow_addons as tfa

Other info / logs

>>> import tensorflow_addons as tfa
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/squadrick/.local/lib/python3.6/site-packages/tensorflow_addons/__init__.py", line 22, in <module>
    from tensorflow_addons import callbacks
  File "/home/squadrick/.local/lib/python3.6/site-packages/tensorflow_addons/callbacks/__init__.py", line 21, in <module>
    from tensorflow_addons.callbacks.tqdm_progress_bar import TQDMProgressBar
  File "/home/squadrick/.local/lib/python3.6/site-packages/tensorflow_addons/callbacks/tqdm_progress_bar.py", line 27, in <module>
    class TQDMProgressBar(Callback):
  File "/home/squadrick/.local/lib/python3.6/site-packages/tensorflow_core/python/keras/utils/generic_utils.py", line 165, in decorator
    'Cannot register a class that does not have a get_config() method.')
ValueError: Cannot register a class that does not have a get_config() method.

Google Colab Link.

[Squadrick]

cc @shun-lin

[shun-lin]

@Squadrick got it, will update as soon as I can :)