preserve backend when using pickling/unpikling

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preserve backend when using pickling/unpikling #38919

Closed dcoudert closed 1 week ago

dcoudert commented 3 weeks ago

Fixes #38900.

The data structure of the graph was not stored. We add it to the stored data.

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[x] The title is concise and informative.
[x] The description explains in detail what this PR is about.
[x] I have linked a relevant issue or discussion.
[x] I have created tests covering the changes.
[x] I have updated the documentation and checked the documentation preview.

:hourglass: Dependencies

github-actions[bot] commented 3 weeks ago

Documentation preview for this PR (built with commit d45dac9ef368239c7c8bca8981a656e2b26d24c3; changes) is ready! :tada: This preview will update shortly after each push to this PR.

dcoudert commented 3 weeks ago

Thank you for the review.