[NOMERG] Add @overload to forward in losses #9175

Job	Run time
build-wheel-windows (3.8, 3.8)	3m 19s
build-wheel-mac (3.8, 3.8)	2m 3s
build-wheel-linux (3.8, cp38-cp38, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 36s
build-wheel-windows (3.9, 3.9)	2m 58s
build-wheel-mac (3.9, 3.9)	1m 59s
build-wheel-windows (3.10, 3.10.3)	3m 32s
build-wheel-linux (3.9, cp39-cp39, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 32s
build-wheel-windows (3.11, 3.11)	2m 58s
build-wheel-mac (3.10, 3.10.3)	2m 13s
build-wheel-linux (3.10, cp310-cp310, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 34s
build-wheel-mac (3.11, 3.11)	2m 30s
build-wheel-linux (3.11, cp311-cp311, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 43s
test-wheel (linux, ubuntu-20.04, 3.8)	2m 41s
test-wheel (linux, ubuntu-20.04, 3.9)	2m 12s
test-wheel (linux, ubuntu-20.04, 3.10)	2m 13s
test-wheel (linux, ubuntu-20.04, 3.11)	2m 49s
test-wheel (mac, macos-11, 3.8)	3m 3s
test-wheel (mac, macos-11, 3.9)	2m 53s
test-wheel (mac, macos-11, 3.10)	3m 9s
test-wheel (mac, macos-11, 3.11)	2m 55s
test-wheel-windows (3.8)	4m 7s
test-wheel-windows (3.9)	4m 26s
test-wheel-windows (3.10)	4m 57s
test-wheel-windows (3.11)	5m 19s
	1h 8m 41s

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