improve type hints #275

Job	Run time
lint	1m 25s
test (ubuntu-latest, 3.10, jax)	5m 41s
test (ubuntu-latest, 3.10, tensorflow)	5m 35s
test (ubuntu-latest, 3.10, torch)	4m 21s
test (ubuntu-latest, 3.11, jax)	7m 0s
test (ubuntu-latest, 3.11, tensorflow)	5m 45s
test (ubuntu-latest, 3.11, torch)	4m 10s
test (windows-latest, 3.10, jax)	10m 38s
test (windows-latest, 3.10, tensorflow)	12m 6s
test (windows-latest, 3.10, torch)	10m 31s
test (windows-latest, 3.11, jax)	11m 39s
test (windows-latest, 3.11, tensorflow)	12m 21s
test (windows-latest, 3.11, torch)	10m 33s
	1h 41m 45s

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