The SR-ERI estimator underestimated the upper bound when two basis fu… #1220

Job	Run time
linux-build (ubuntu-20.04, 3.8)	50m 51s
linux-build (ubuntu-20.04, 3.12)	43m 9s
linux-build-aarch64 (ubuntu-20.04, cp39-cp39)	7m 36s
macos-build (3.10)	22m 3s
	2h 3m 39s

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