JupyterLab中用ipysigma+NetworkX遇“model not found”错误求助

尝试在JupyterLab中结合NetworkX使用ipysigma，先后更换版本、改用Notebook等方案均未解决问题。该错误相关讨论无有效回复，且并非ipysigma专属问题。

复现代码 #

import networkx as nx
from ipysigma import Sigma

G = nx.petersen_graph()
Sigma(G)

运行后报错：

Error displaying widget: model not found

扩展启用情况 #

me>jupyter labextension list
JupyterLab v4.2.5
C:\Users\me\AppData\Local\anaconda3\envs\my\share\jupyter\labextensions
    ipysigma v0.24.3 enabled ok (python, ipysigma)
    jupyter-matplotlib v0.11.4 enabled ok
    jupyterlab_pygments v0.3.0 enabled ok (python, jupyterlab_pygments)
    @jupyter-notebook/lab-extension v7.2.2 enabled ok
    @jupyter-widgets/jupyterlab-manager v3.1.10 enabled  X (python, 
jupyterlab_widgets)

相关包版本 #

ipykernel                 6.29.5             pyh4bbf305_0    conda-forge
ipympl                    0.9.4              pyhd8ed1ab_0    conda-forge
ipysigma                  0.24.3                   pypi_0    pypi
ipython                   8.27.0             pyh7428d3b_0    conda-forge
ipython_genutils          0.2.0              pyhd8ed1ab_1    conda-forge
ipywidgets                7.6.5              pyhd8ed1ab_0    conda-forge

jupyter                   1.1.1              pyhd8ed1ab_0    conda-forge
jupyter-lsp               2.2.5              pyhd8ed1ab_0    conda-forge
jupyter_client            8.6.2              pyhd8ed1ab_0    conda-forge
jupyter_console           6.6.3              pyhd8ed1ab_0    conda-forge
jupyter_core              5.7.2           py312h2e8e312_0    conda-forge
jupyter_events            0.10.0             pyhd8ed1ab_0    conda-forge
jupyter_server            2.14.2             pyhd8ed1ab_0    conda-forge
jupyter_server_terminals  0.5.3              pyhd8ed1ab_0    conda-forge
jupyterlab                4.2.5              pyhd8ed1ab_0    conda-forge
jupyterlab_pygments       0.3.0              pyhd8ed1ab_1    conda-forge
jupyterlab_server         2.27.3             pyhd8ed1ab_0    conda-forge
jupyterlab_widgets        1.1.10             pyhd8ed1ab_0    conda-forge

解决方案 #

从扩展状态可见@jupyter-widgets/jupyterlab-manager标记了X，说明组件加载失败，核心原因是ipywidgets版本与JupyterLab 4.x不兼容（JupyterLab 4要求ipywidgets 8.x，当前版本为7.6.5）。按以下步骤修复：

1. 卸载旧版本的widget相关包

pip uninstall ipywidgets jupyterlab_widgets -y

2. 安装与JupyterLab 4兼容的版本

pip install ipywidgets==8.1.2 jupyterlab_widgets==3.0.10

3. 重建JupyterLab扩展并重启

jupyter lab build
jupyter lab clean

完成后关闭当前JupyterLab，重新启动。

4. （可选）验证ipysigma兼容性
   若上述步骤后仍有问题，尝试升级ipysigma到最新兼容版本：

pip install --upgrade ipysigma

内容的提问来源于stack exchange，提问作者Joe