Fixes #702: Resolve TypeError in mapper_quickstart.ipynb tutorial notebook

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Pull Request Description

Summary

This pull request addresses the issue reported in Issue #702 regarding an error encountered when executing the mapper_quickstart.ipynb notebook. The error resulted from compatibility issues between scikit-learn version 1.5.2 and the giotto-tda library.

Problem Statement

The user reported errors stemming from the following snippet in the notebook:

fig = plot_static_mapper_graph(pipe, data)
fig.show(config={'scrollZoom': True})

The detailed traceback indicated a TypeError due to changes in the scikit-learn API that have not been reflected in the ListFeatureUnion class within giotto-tda. The main consequence is an inability to use the notebook seamlessly under the current library conditions.

Actions Taken

Short-term Fix

• Downgraded scikit-learn from version 1.5.2 to 1.3.2, which resolves the immediate error and allows the tutorial to function correctly with giotto-tda version 0.6.2.

Long-term Recommendations

To ensure ongoing compatibility with future versions of scikit-learn, it is recommended that the ListFeatureUnion class in giotto-tda be updated. The key changes should include:

• Adjustments to the parameter routing within the _parallel_func method.
• Modifications to transformer handling to accommodate the new functionalities and parameters introduced in scikit-learn 1.5.2.

User Guidance

• Users are advised to create a separate virtual environment that includes both giotto-tda and scikit-learn 1.3.2 to work through the tutorial notebooks, while maintaining their main environment with the updated version of scikit-learn.

Conclusion

The applied short-term fix enables users to proceed with tutorial usage without encountering errors. Attention from the maintainers is required for long-term updates to ensure compatibility with upcoming changes in scikit-learn.

Fixes #702

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