Jupyter Notebooks not displaying progress bars

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The answer is in this GitHub issue.

The key is to ensure that you have the ipywidgets notebook extension enabled using the following command:

jupyter nbextension enable --py widgetsnbextension

For the old JupyterLab 2.0 you’ll also need to install the JupyterLab extension:

jupyter labextension install @jupyter-widgets/jupyterlab-manager

For the old JupyterLab 2.0 installing the JupyterLab extension with the command above requires that you have Node.js installed. The installer from the Node.js website includes npm, which is also required for the command to run properly.

When using JupyterLab 3.0, the extension will be auto-installed together with ipywidgets when you install it with pip or conda. Node.js is no longer required for JupyterLab 3.0.

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