AttributeError: module 'tensorboard.util' has no attribute 'PersistentOpEvaluator'

Getting next error on tensorboard launch attempt:

PS C:\Users\user> tensorboard
Traceback (most recent call last):
  File "c:\users\user\appdata\local\programs\python\python36\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\users\user\appdata\local\programs\python\python36\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "c:\users\user\appdata\local\programs\python\python36\Scripts\tensorboard.exe\__main__.py", line 5, in <module>
  File "c:\users\user\appdata\local\programs\python\python36\lib\site-packages\tensorboard\main.py", line 45, in <module>
    from tensorboard import default
  File "c:\users\user\appdata\local\programs\python\python36\lib\site-packages\tensorboard\default.py", line 38, in <module>
    from tensorboard.plugins.beholder import beholder_plugin
  File "c:\users\user\appdata\local\programs\python\python36\lib\site-packages\tensorboard\plugins\beholder\__init__.py", line 15, in <module>
    from tensorboard.plugins.beholder.beholder import Beholder
  File "c:\users\user\appdata\local\programs\python\python36\lib\site-packages\tensorboard\plugins\beholder\beholder.py", line 25, in <module>
    from tensorboard.plugins.beholder import im_util
  File "c:\users\user\appdata\local\programs\python\python36\lib\site-packages\tensorboard\plugins\beholder\im_util.py", line 89, in <module>
    class PNGDecoder(util.PersistentOpEvaluator):
AttributeError: module 'tensorboard.util' has no attribute 'PersistentOpEvaluator'

Version:

PS C:\Users\user> pip show tensorboard
Name: tensorboard
Version: 1.12.1
Summary: TensorBoard lets you watch Tensors Flow
Home-page: https://github.com/tensorflow/tensorboard
Author: Google Inc.
Author-email: [e-mail]
License: Apache 2.0
Location: c:\users\user\appdata\local\programs\python\python36\lib\site-packages
Requires: werkzeug, markdown, protobuf, six, numpy, grpcio, wheel
Required-by: tensorflow-gpu

• Windows 10, 64
• Python version 3.6

Thank you!

[stephanwlee]

Hello everyone, thanks for reporting the issue. Which version of TensorFlow have you installed? This can happen if you have tb-nightly installed on your virtualenv then install tensorboard==1.12.x.

Like @kenpachiii put, can you try to delete tensorboad directory in site-packages (Location in pip show tensorboard) then pip install tensorboard==1.12?

[kenpachiii]

I got it working with the following steps:

1. pip uninstall tensorflow
2. pip uninstall tensorboard
3. go to site-packages and remove tensorflow/tensorboard folders
4. Reinstalled tensorflow - pip install [whatever wheel package]

You can find the wheel packages here for specific install types: https://www.tensorflow.org/install/pip

Note: I only stated the specific wheel package because that’s what I did.

I know this doesn’t explain the ‘why’ of the issue but it got things going for me. Hope it helps!