Kron flatten improvements + stochastic weight decay #2499

Job	Run time
Run tests on ubuntu-latest with Python 3.10	1m 45s
Run tests on ubuntu-latest with Python 3.10	1h 1m 51s
Run tests on ubuntu-latest with Python 3.10	1h 26m 24s
Run tests on ubuntu-latest with Python 3.10	32m 2s
Run tests on ubuntu-latest with Python 3.10	34m 55s
Run tests on ubuntu-latest with Python 3.10	42m 57s
Run tests on ubuntu-latest with Python 3.10	35m 1s
Run tests on ubuntu-latest with Python 3.10	2m 46s
Run tests on ubuntu-latest with Python 3.10	43m 9s
Run tests on ubuntu-latest with Python 3.10	1h 5m 8s
Run tests on ubuntu-latest with Python 3.10	31m 0s
Run tests on ubuntu-latest with Python 3.10	30m 2s
Run tests on ubuntu-latest with Python 3.10	39m 5s
Run tests on ubuntu-latest with Python 3.10	31m 33s
Run tests on ubuntu-latest with Python 3.12	2m 45s
Run tests on ubuntu-latest with Python 3.12	44m 8s
Run tests on ubuntu-latest with Python 3.12	1h 8m 51s
Run tests on ubuntu-latest with Python 3.12	30m 31s
Run tests on ubuntu-latest with Python 3.12	31m 34s
Run tests on ubuntu-latest with Python 3.12	40m 14s
Run tests on ubuntu-latest with Python 3.12	32m 37s
	13h 8m 18s

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