simplify inference #615

Job	Run time
downgrade (1.10, downstream)	20s
downgrade (1.10, misc)	22s
downgrade (1.10, core)	19s
downgrade (1.10, wrappers)	18s
test (core, 1.10, macos-latest)	25m 23s
test (core, 1, ubuntu-latest)	28m 30s
test (core, 1.10, ubuntu-latest)	17m 52s
test (core, pre, macos-latest)	34m 55s
test (core, 1, macos-latest)	32m 49s
test (downstream, 1.10, macos-latest)	9m 20s
test (downstream, 1, ubuntu-latest)	23m 16s
test (downstream, 1.10, ubuntu-latest)	11m 38s
test (core, pre, ubuntu-latest)	48m 39s
test (downstream, pre, macos-latest)	37m 44s
test (wrappers, 1, ubuntu-latest)	20m 21s
test (wrappers, 1.10, ubuntu-latest)	9m 48s
test (downstream, pre, ubuntu-latest)	48m 52s
test (wrappers, 1.10, macos-latest)	5m 58s
test (misc, 1.10, ubuntu-latest)	8m 42s
test (wrappers, pre, ubuntu-latest)	48m 34s
test (downstream, 1, macos-latest)	16m 59s
test (misc, 1.10, macos-latest)	1s
test (wrappers, 1, macos-latest)	12m 56s
test (misc, 1, macos-latest)	1s
test (misc, 1, ubuntu-latest)	21m 25s
test (wrappers, pre, macos-latest)	2h 46m 7s
test (misc, pre, ubuntu-latest)	47m 52s
test (misc, pre, macos-latest)	9m 32s
	11h 28m 33s

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