Replaced eigvals with subset_by_index (#913) #3723

Job	Run time
code-quality	4m 4s
build (ubuntu-latest, 3.8, 1.10.15)	38m 32s
docs	4m 33s
licenses	48s
build (ubuntu-latest, 3.8, 2.7.1)	38m 54s
optional_dependencies (default)	51s
build (ubuntu-latest, 3.9, 1.10.15)	40m 43s
optional_dependencies (tensorflow)	1m 19s
build (ubuntu-latest, 3.9, 2.7.1)	39m 56s
optional_dependencies (torch)	2m 14s
build (ubuntu-latest, 3.10, 1.10.15)	39m 19s
optional_dependencies (prophet)	55s
optional_dependencies (keops)	2m 16s
build (ubuntu-latest, 3.10, 2.7.1)	38m 51s
optional_dependencies (all)	2m 51s
build (ubuntu-latest, 3.11, 1.10.15)	39m 58s
build (ubuntu-latest, 3.11, 2.7.1)	39m 37s
build (windows-latest, 3.10, 1.10.15)	45m 13s
build (windows-latest, 3.10, 2.7.1)	44m 39s
	7h 5m 33s

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