Python 出現Javascript Error: IPython is not defined in JupyterLab

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RUN  Exercise 5.4: Q-Learning Agent 時出現

Python Javascript Error JupyterLab

使用 conda
conda install -c conda-forge ipympl
# If using the Notebook
conda install -c conda-forge widgetsnbextension
# If using JupyterLab
conda install nodejs
jupyter labextension install @jupyter-widgets/jupyterlab-manager
jupyter labextension install jupyter-matplotlib

使用pip
pip install ipympl
# If using JupyterLab
conda install nodejs
jupyter labextension install @jupyter-widgets/jupyterlab-manager
jupyter labextension install jupyter-matplotlib

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