[Feature] Better constructors for MemoryMappedTensors #1866

Job	Run time
build-wheel-mac (3.8, 3.8)	1m 10s
build-wheel-linux (3.8, cp38-cp38, --extra-index-url https://download.pytorch.org/whl/cpu, "['cpu...	2m 25s
build-wheel-windows (3.8, 3.8)	3m 48s
build-wheel-mac (3.9, 3.9)	53s
build-wheel-linux (3.9, cp39-cp39, --extra-index-url https://download.pytorch.org/whl/cpu, "['cpu...	1m 14s
build-wheel-windows (3.9, 3.9)	1m 54s
build-wheel-mac (3.10, 3.10.3)	1m 12s
build-wheel-linux (3.10, cp310-cp310, --extra-index-url https://download.pytorch.org/whl/cpu, "['...	1m 10s
build-wheel-windows (3.10, 3.10.3)	2m 47s
build-wheel-mac (3.11, 3.11)	1m 1s
build-wheel-linux (3.11, cp311-cp311, --extra-index-url https://download.pytorch.org/whl/cpu, "['...	1m 10s
build-wheel-windows (3.11, 3.11)	1m 53s
test-wheel (linux, ubuntu-20.04, 3.8)	1m 17s
test-wheel (linux, ubuntu-20.04, 3.9)	51s
test-wheel (linux, ubuntu-20.04, 3.10)	54s
test-wheel (linux, ubuntu-20.04, 3.11)	46s
test-wheel (mac, macos-latest, 3.8)	3m 39s
test-wheel (mac, macos-latest, 3.9)	1m 30s
test-wheel (mac, macos-latest, 3.10)	1m 29s
test-wheel (mac, macos-latest, 3.11)	1m 50s
test-wheel-windows (3.8)	3m 13s
test-wheel-windows (3.9)	3m 6s
test-wheel-windows (3.10)	2m 51s
test-wheel-windows (3.11)	2m 36s
	44m 39s

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