update edge weights to be negative coefficient magnitude #733

Job	Run time
lint/style-and-typos	1m 15s
linux/3.8/bare-env	11s
linux/3.12	24m 52s
osx/3.10	11m 47s
win/3.9	25m 19s
linux/3.11/conda	24m 33s
linux/3.10/mpi	9m 19s
linux/3.10/cython	23m 21s
win/3.8/pip	25m 20s
process-coverage-${{ matrix.TARGET }}	1s
	2h 25m 58s

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