Optuna: Visualizations don't work in Jupyter Lab

[srizvan]

Visualizations don't work in Jupyter Lab. I see just empty (white) plots. In Jupyter Notebook everything is OK.

Expected behavior

Visualizations should be available from Jupyter Lab.

Environment

• Optuna version: 1.0.0
• Python version: 3.7.4
• OS: Ubuntu 18.04.3
• (Optional) Other libraries and their versions:
  plotly==4.4.1
  jupyterlab==1.2.4
  jupyterlab-server==1.0.6

Steps to reproduce

1. Create a study object.
2. Run study.optimize
3. Plot any visualization.

Reproducible examples (optional)

optuna.visualization.plot_slice(study)

Or any other plot.

Additional context (optional)

Screenshot of empty visualization:

There is an error in the browser console:

[harupy]

@srizvan Did you follow the steps stated here?

[toshihikoyanase]

@srizvan Thank you for reporting the issue.
I reproduced your issue and found that the additional installation step suggested by @harupy solved it as follows:

@harupy Thank you for your information.

Environment

• Optuna version: 1.0.0
• Python version: 3.7.2
• OS: macOS 10.13.6
• Other libraries and their versions:
  
  
  
  • plotly==4.4.1
  
  
  • jupyterlab==1.2.4
  
  
  • jupyterlab-server==1.0.6
  
  

[srizvan]

@harupy Yeah, that worked for me. Thank you.
I think, link to these additional steps should be provided in optuna docs in the "Installation" section.

[toshihikoyanase]

@srizvan Thank you for your feedback.
I created a PR (https://github.com/optuna/optuna/pull/843) to update the document for JupyterLab users to solve this issue. Please let me know if you have any comments.