Traceback (most recent call last):


 "/…/lib/python3.5/site-packages/celery/app/trace.py", line 431, in trace_task

parent_id=uuid, root_id=root_id,


 "/…/lib/python3.5/site-packages/celery/canvas.py", line 222, in apply_async

return _apply(args, kwargs, **options)


 "/…/lib/python3.5/site-packages/celery/app/task.py", line 536, in apply_async

**options


 "/…/lib/python3.5/site-packages/celery/app/base.py", line 729, in send_task

root_id, parent_id, shadow, chain,


 "/…/lib/python3.5/site-packages/celery/app/amqp.py", line 333, in as_task_v2

eta = eta and eta.isoformat()
AttributeError: 'str' object has no attribute 'isoformat'

Traceback (most recent call last):


 "examples/asr/aishell/local/prepare_data.py", line 29, in <module>

from athena import get_wave_file_length


 "/data/nfs_rt16/chenyu/asr/athena/athena/__init__.py", line 35, in <module>

from .layers.commons import PositionalEncoding


 "/data/nfs_rt16/chenyu/asr/athena/athena/layers/commons.py", line 22, in <module>

import tensorflow_addons as tfa


 "/data/nfs_rt16/chenyu/asr/venv_athena/lib/python3.7/site-packages/tensorflow_addons/__init__.py", line 21, in <module>

from tensorflow_addons import activations


 "/data/nfs_rt16/chenyu/asr/venv_athena/lib/python3.7/site-packages/tensorflow_addons/activations/__init__.py", line 17, in <module>

from tensorflow_addons.activations.gelu import gelu


 "/data/nfs_rt16/aa/asr/venv_athena/lib/python3.7/site-packages/tensorflow_addons/activations/gelu.py", line 27, in <module>

@tf.keras.utils.register_keras_serializable(package="Addons")
AttributeError: module 'tensorflow_core.keras.utils' has no attribute 'register_keras_serializable'
