[BugFix] buffer iter for samplers without replacement + prefetch #10392

Job	Run time
build-wheel-linux (3.8, cp38-cp38, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 35s
build-wheel-windows (3.8, 3.8)	2m 54s
build-wheel-linux (3.9, cp39-cp39, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 41s
build-wheel-windows (3.9, 3.9)	2m 34s
build-wheel-linux (3.10, cp310-cp310, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 45s
build-wheel-windows (3.10, 3.10.3)	2m 56s
build-wheel-linux (3.11, cp311-cp311, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 37s
build-wheel-windows (3.11, 3.11)	3m 36s
test-wheel (linux, ubuntu-20.04, 3.8)	2m 23s
test-wheel (linux, ubuntu-20.04, 3.9)	2m 8s
test-wheel (linux, ubuntu-20.04, 3.10)	2m 28s
test-wheel (linux, ubuntu-20.04, 3.11)	3m 56s
test-wheel-windows (3.8)	4m 10s
test-wheel-windows (3.9)	4m 0s
test-wheel-windows (3.10)	4m 33s
test-wheel-windows (3.11)	5m 25s
	47m 41s

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