[Feature] empty_lazy for lazy tensor storages

[vmoens]

Stack from ghstack (oldest at bottom):

• -> #2955

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2955

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:x: 9 New Failures, 2 Cancelled Jobs, 4 Unrelated Failures

As of commit 9d7df23a81421520624e0a4bba7eb33033df46db with merge base 8dcf9877d138b6a225c5844b4e82b100508c561d ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / GPU Pytest benchmark (gh) Process completed with exit code 1.
• Generate documentation / build-docs (3.9, 12.8) / linux-job (gh) RuntimeError: Command docker exec -t f12fd071960a2cbfe2daa530278a990b5e03013be8574534889d5e04d86e914a /exec failed with exit code 2
• Unit-tests on Linux / tests-cpu (3.10) / linux-job (gh) test/test_rb.py::TestStorages::test_extend_empty_lazy
• Unit-tests on Linux / tests-cpu (3.11) / linux-job (gh) test/test_rb.py::TestStorages::test_extend_empty_lazy
• Unit-tests on Linux / tests-cpu (3.12) / linux-job (gh) test/test_rb.py::TestStorages::test_extend_empty_lazy
• Unit-tests on Linux / tests-cpu (3.9) / linux-job (gh) test/test_rb.py::TestStorages::test_extend_empty_lazy
• Unit-tests on Linux / tests-gpu (3.11, 12.8) / linux-job (gh) test/test_rb.py::TestStorages::test_extend_empty_lazy
• Unit-tests on Linux / tests-optdeps (3.11, 12.8) / linux-job (gh) test/test_rb.py::TestStorages::test_extend_empty_lazy
• Unit-tests on Linux / tests-stable-gpu (3.10, 11.8) / linux-job (gh) test/test_rb.py::TestStorages::test_extend_empty_lazy

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
• LLM Tests on Linux / unittests (3.9, 12.8) / linux-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Habitat Tests on Linux / tests (3.9, 12.8) / linux-job (gh) (matched linux rule in flaky-rules.json) E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/d/dpkg/libdpkg-perl_1.21.1ubuntu2.3_all.deb 403 Forbidden [IP: 185.125.190.83 80]
• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh) (matched linux rule in flaky-rules.json) E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/x/xorg-sgml-doctools/xorg-sgml-doctools_1.11-1.1_all.deb 403 Forbidden [IP: 185.125.190.82 80]

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Unit-tests on Linux / tests-olddeps (3.9, 11.6) / linux-job (gh) (trunk failure) test/test_transforms.py::TestActionDiscretizer::test_transform_env[cheetah-SamplingStrategy.RANDOM-False-True]
• Unit-tests on Windows / unittests-cpu (3.10, windows.4xlarge, cpu) / windows-job (gh) (trunk failure)

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