Don't torch.export over lengths_per_key default computation if values is on meta device #5726

	name: Pyre Check

	on:
	push:
	branches: [main]
	pull_request:

	jobs:
	pyre-check:
	runs-on: ubuntu-22.04
	defaults:
	run:
	shell: bash -el {0}
	steps:
	- uses: conda-incubator/setup-miniconda@v2
	with:
	python-version: 3.9
	- name: Checkout Torchrec
	uses: actions/checkout@v2
	- name: Install dependencies
	run: >
	conda install --yes pytorch cpuonly -c pytorch-nightly &&
	pip install fbgemm-gpu --index-url https://download.pytorch.org/whl/nightly/cpu &&
	pip install -r requirements.txt &&
	pip install pyre-check-nightly==$(cat .pyre_configuration \| grep version \| awk '{print $2}' \| sed 's/\"//g')
	- name: Pyre check
	run: pyre check

Provide feedback