Implement approximate mode #664

Job	Run time
generate-matrix / generate	7s
Build and Upload wheel / manywheel-py3_9-cuda11_8	7m 6s
Build and Upload wheel / manywheel-py3_9-cuda12_4	7m 18s
Build and Upload wheel / manywheel-py3_9-cuda12_6	6m 54s
Build and Upload wheel / upload / manywheel-py3_9-cuda11_8	19s
Build and Upload wheel / upload / manywheel-py3_9-cuda12_4	18s
Build and Upload wheel / upload / manywheel-py3_9-cuda12_6	19s
install-and-test (3.9, 11.8, 5)	6m 1s
install-and-test (3.9, 11.8, 6)	9m 14s
install-and-test (3.9, 11.8, 7)	9m 15s
install-and-test (3.9, 12.4, 5)	6m 17s
install-and-test (3.9, 12.4, 6)	11m 13s
install-and-test (3.9, 12.4, 7)	11m 43s
install-and-test (3.9, 12.6, 5)	5m 46s
install-and-test (3.9, 12.6, 6)	9m 11s
install-and-test (3.9, 12.6, 7)	9m 19s
	1h 40m 20s

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