Rename Strategy.reduce to Strategy.all_reduce in Lite

[awaelchli]

What does this PR do?

Rename the reduce method to all_reduce according to what it is doing and avoid confusion with the the regular reduce operation with a single destination. See also all_gather vs gather.

Does your PR introduce any breaking changes? If yes, please list them.

No, Fabric is in Beta.

Before submitting

• Was this discussed/approved via a GitHub issue? (not for typos and docs)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests? (not for typos and docs)
• Did you verify new and existing tests pass locally with your changes?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or internal minor changes/refactorings)

PR review

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Did you have fun?

I made sure I had fun coding 🙃

cc @Borda @justusschock

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu (macOS-11, pytorch, 3.8, 1.11)	success	✅
pl-cpu (macOS-11, pytorch, 3.9, 1.12)	success	✅
pl-cpu (macOS-11, pytorch, 3.10, 1.13)	success	✅
pl-cpu (macOS-11, pytorch, 3.8, 1.10, oldest)	success	✅
pl-cpu (ubuntu-20.04, pytorch, 3.8, 1.10)	success	✅
pl-cpu (ubuntu-20.04, pytorch, 3.9, 1.11)	success	✅
pl-cpu (ubuntu-20.04, pytorch, 3.10, 1.12)	success	✅
pl-cpu (ubuntu-20.04, pytorch, 3.10, 1.13)	success	✅
pl-cpu (ubuntu-20.04, pytorch, 3.7, 1.10, oldest)	success	✅
pl-cpu (windows-2022, pytorch, 3.9, 1.11)	success	✅
pl-cpu (windows-2022, pytorch, 3.10, 1.12)	success	✅
pl-cpu (windows-2022, pytorch, 3.10, 1.13)	success	✅
pl-cpu (windows-2022, pytorch, 3.7, 1.10, oldest)	success	✅
pl-cpu (slow, macOS-11, pytorch, 3.7, 1.11)	success	✅
pl-cpu (slow, ubuntu-20.04, pytorch, 3.7, 1.11)	success	✅
pl-cpu (slow, windows-2022, pytorch, 3.7, 1.11)	success	✅
pl-cpu (macOS-11, lightning, 3.8, 1.13)	success	✅
pl-cpu (ubuntu-20.04, lightning, 3.8, 1.13)	success	✅
pl-cpu (windows-2022, lightning, 3.8, 1.13)	success	✅

These checks are required after the changes to src/lightning_fabric/strategies/ddp.py, src/lightning_fabric/strategies/dp.py, src/lightning_fabric/strategies/fsdp.py, src/lightning_fabric/strategies/parallel.py, src/lightning_fabric/strategies/single_device.py, src/lightning_fabric/strategies/strategy.py, src/lightning_fabric/strategies/xla.py.

🟢 pytorch_lightning: Azure GPU

Check ID	Status
pytorch-lightning (GPUs)	success	✅

These checks are required after the changes to src/lightning_fabric/strategies/ddp.py, src/lightning_fabric/strategies/dp.py, src/lightning_fabric/strategies/fsdp.py, src/lightning_fabric/strategies/parallel.py, src/lightning_fabric/strategies/single_device.py, src/lightning_fabric/strategies/strategy.py, src/lightning_fabric/strategies/xla.py.

🟢 pytorch_lightning: Azure HPU

Check ID	Status
pytorch-lightning (HPUs)	success	✅

These checks are required after the changes to src/lightning_fabric/strategies/ddp.py, src/lightning_fabric/strategies/dp.py, src/lightning_fabric/strategies/fsdp.py, src/lightning_fabric/strategies/parallel.py, src/lightning_fabric/strategies/single_device.py, src/lightning_fabric/strategies/strategy.py, src/lightning_fabric/strategies/xla.py.

🟢 pytorch_lightning: Azure IPU

Check ID	Status
pytorch-lightning (IPUs)	success	✅

These checks are required after the changes to src/lightning_fabric/strategies/ddp.py, src/lightning_fabric/strategies/dp.py, src/lightning_fabric/strategies/fsdp.py, src/lightning_fabric/strategies/parallel.py, src/lightning_fabric/strategies/single_device.py, src/lightning_fabric/strategies/strategy.py, src/lightning_fabric/strategies/xla.py.

🟢 lightning_fabric: CPU workflow

Check ID	Status
fabric-cpu (macOS-11, fabric, 3.8, 1.11)	success	✅
fabric-cpu (macOS-11, fabric, 3.9, 1.12)	success	✅
fabric-cpu (macOS-11, fabric, 3.10, 1.13)	success	✅
fabric-cpu (macOS-11, fabric, 3.7, 1.10, oldest)	success	✅
fabric-cpu (ubuntu-20.04, fabric, 3.8, 1.10)	success	✅
fabric-cpu (ubuntu-20.04, fabric, 3.9, 1.11)	success	✅
fabric-cpu (ubuntu-20.04, fabric, 3.10, 1.12)	success	✅
fabric-cpu (ubuntu-20.04, fabric, 3.10, 1.13)	success	✅
fabric-cpu (ubuntu-20.04, fabric, 3.7, 1.10, oldest)	success	✅
fabric-cpu (windows-2022, fabric, 3.9, 1.11)	success	✅
fabric-cpu (windows-2022, fabric, 3.10, 1.12)	success	✅
fabric-cpu (windows-2022, fabric, 3.10, 1.13)	success	✅
fabric-cpu (windows-2022, fabric, 3.7, 1.10, oldest)	success	✅
fabric-cpu (macOS-11, lightning, 3.8, 1.13)	success	✅
fabric-cpu (ubuntu-20.04, lightning, 3.8, 1.13)	success	✅
fabric-cpu (windows-2022, lightning, 3.8, 1.13)	success	✅

These checks are required after the changes to src/lightning_fabric/strategies/ddp.py, src/lightning_fabric/strategies/dp.py, src/lightning_fabric/strategies/fsdp.py, src/lightning_fabric/strategies/parallel.py, src/lightning_fabric/strategies/single_device.py, src/lightning_fabric/strategies/strategy.py, src/lightning_fabric/strategies/xla.py, tests/tests_fabric/strategies/launchers/test_xla.py, tests/tests_fabric/strategies/test_single_device.py, tests/tests_fabric/strategies/test_xla.py.

🟢 lightning_fabric: Azure GPU

Check ID	Status
lightning-fabric (GPUs)	success	✅

These checks are required after the changes to src/lightning_fabric/strategies/ddp.py, src/lightning_fabric/strategies/dp.py, src/lightning_fabric/strategies/fsdp.py, src/lightning_fabric/strategies/parallel.py, src/lightning_fabric/strategies/single_device.py, src/lightning_fabric/strategies/strategy.py, src/lightning_fabric/strategies/xla.py, tests/tests_fabric/strategies/launchers/test_xla.py, tests/tests_fabric/strategies/test_single_device.py, tests/tests_fabric/strategies/test_xla.py.

🟢 mypy

Check ID	Status
mypy	success	✅

These checks are required after the changes to src/lightning_fabric/strategies/ddp.py, src/lightning_fabric/strategies/dp.py, src/lightning_fabric/strategies/fsdp.py, src/lightning_fabric/strategies/parallel.py, src/lightning_fabric/strategies/single_device.py, src/lightning_fabric/strategies/strategy.py, src/lightning_fabric/strategies/xla.py.

🟢 install

Check ID	Status
install-pkg (ubuntu-22.04, app, 3.7)	success	✅
install-pkg (ubuntu-22.04, app, 3.10)	success	✅
install-pkg (ubuntu-22.04, fabric, 3.7)	success	✅
install-pkg (ubuntu-22.04, fabric, 3.10)	success	✅
install-pkg (ubuntu-22.04, pytorch, 3.7)	success	✅
install-pkg (ubuntu-22.04, pytorch, 3.10)	success	✅
install-pkg (ubuntu-22.04, lightning, 3.7)	success	✅
install-pkg (ubuntu-22.04, lightning, 3.10)	success	✅
install-pkg (ubuntu-22.04, notset, 3.7)	success	✅
install-pkg (ubuntu-22.04, notset, 3.10)	success	✅
install-pkg (macOS-12, app, 3.7)	success	✅
install-pkg (macOS-12, app, 3.10)	success	✅
install-pkg (macOS-12, fabric, 3.7)	success	✅
install-pkg (macOS-12, fabric, 3.10)	success	✅
install-pkg (macOS-12, pytorch, 3.7)	success	✅
install-pkg (macOS-12, pytorch, 3.10)	success	✅
install-pkg (macOS-12, lightning, 3.7)	success	✅
install-pkg (macOS-12, lightning, 3.10)	success	✅
install-pkg (macOS-12, notset, 3.7)	success	✅
install-pkg (macOS-12, notset, 3.10)	success	✅
install-pkg (windows-2022, app, 3.7)	success	✅
install-pkg (windows-2022, app, 3.10)	success	✅
install-pkg (windows-2022, fabric, 3.7)	success	✅
install-pkg (windows-2022, fabric, 3.10)	success	✅
install-pkg (windows-2022, pytorch, 3.7)	success	✅
install-pkg (windows-2022, pytorch, 3.10)	success	✅
install-pkg (windows-2022, lightning, 3.7)	success	✅
install-pkg (windows-2022, lightning, 3.10)	success	✅
install-pkg (windows-2022, notset, 3.7)	success	✅
install-pkg (windows-2022, notset, 3.10)	success	✅

These checks are required after the changes to src/lightning_fabric/strategies/ddp.py, src/lightning_fabric/strategies/dp.py, src/lightning_fabric/strategies/fsdp.py, src/lightning_fabric/strategies/parallel.py, src/lightning_fabric/strategies/single_device.py, src/lightning_fabric/strategies/strategy.py, src/lightning_fabric/strategies/xla.py.

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