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merge double_factorial (#9431)

* merge double_factorial

* fix ruff error

* fix merge issues

* change test case

* fix import error
D
dekomori_sanae09 committed
b60a94b5b305487ca5f5755ab6de2bf0adeb3d78
Parent: e60779c
Committed by GitHub <noreply@github.com> on 10/3/2023, 1:53:27 PM