Add type hints for runner/base_runner

[ytzhao]

Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily get feedback. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.

Motivation

Add type hints for runner/base_runner.

Modification

• mmcv/runner/base_runner.py
• mmcv/runner/checkpoint.py
• mmcv/runner/epoch_based_runner.py
• mmcv/runner/hooks/lr_updater.py
• mmcv/runner/iter_based_runner.py

BC-breaking (Optional)

No

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects, like MMDet or MMCls.
• CLA has been signed and all committers have signed the CLA in this PR.

[HAOCHENYE]

Hi~ Is there any progress?

[ytzhao]

Hi~ Is there any progress?

Hi @HAOCHENYE already updated, pls take a review, thanks ;-)

[zhouzaida]

Hi~ Is there any progress?

Hi @HAOCHENYE already updated, pls take a review, thanks ;-)

Hi, thanks for your contributions. We can also add type hints for epoch_based_runner.py and iter_based_runner.py at this PR.

[HAOCHENYE]

Hi~ @ytzhao, Is there any progress?

[HAOCHENYE]

@ytzhao Hi~ The lint seems failed.

[ytzhao]

@HAOCHENYE Hi, the unit_tests job is in progress for a long time, it started 2d ish ago, weird.

[zhouzaida]

@HAOCHENYE Hi, the unit_tests job is in progress for a long time, it started 2d ish ago, weird.

Hi, that is ok. That unit test needs to be triggered by us manually.

[ytzhao]

@HAOCHENYE Hi, the unit_tests job is in progress for a long time, it started 2d ish ago, weird.

Hi, that is ok. That unit test needs to be triggered by us manually.

@zhouzaida @HAOCHENYE Hi, please check the latest updated, thanks

[zhouzaida]

@HAOCHENYE Hi, the unit_tests job is in progress for a long time, it started 2d ish ago, weird.

Hi, that is ok. That unit test needs to be triggered by us manually.

@zhouzaida @HAOCHENYE Hi, please check the latest updated, thanks

Okay