Failed to display Jupyter Widget of type HBox.

Using the TQDMNotebookCallback doesn’t seem to work, I have updated jupyter, notebook, and ipywidgets as well as rerunning jupyter nbextension enable --py widgetsnbextension but when using the callback in the fit function I get the following message.

Failed to display Jupyter Widget of type HBox.
If you're reading this message in Jupyter Notebook or JupyterLab, it may mean that the widgets JavaScript is still loading. If this message persists, it likely means that the widgets JavaScript library is either not installed or not enabled. See the Jupyter Widgets Documentation for setup instructions.
If you're reading this message in another notebook frontend (for example, a static rendering on GitHub or NBViewer), it may mean that your frontend doesn't currently support widgets.

[simon19891101]

Similar things happened to me as well, only getting:

HBox(children=(IntProgress(value=0, description=u’Training’, max=3), HTML(value=u’‘))) HBox(children=(IntProgress(value=0, description=u’Epoch 0’, max=101556), HTML(value=u’')))

[yarikoptic]

FWIW, seeing HBox’es on

4.45.0 3.7.6 | packaged by conda-forge | (default, Mar 23 2020, 23:03:20) 
[GCC 7.3.0] linux

while using our tqdm code in datalad (which used to work) and trying that example in tqdm document. no reports on anything “failed”