Add version requirement for filelock and nni

[KumoLiu]

Add version requirement for filelock and nni

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

[ericspod]

We may want to change how cv2 is imported in the video_dataset.py file which is a bit of an usual workaround. It currently will import it as an option but used everywhere without checking if it's present, so having regular import statements in the methods which use it may be a better idea and get around the issue of needing cv2 to generate docs.

[KumoLiu]

We may want to change how cv2 is imported in the video_dataset.py file which is a bit of an usual workaround. It currently will import it as an option but used everywhere without checking if it's present, so having regular import statements in the methods which use it may be a better idea and get around the issue of needing cv2 to generate docs.

It's wired, opencv-python-headless is added in this PR: 1268488.
Before we don't require this package to be installed.

[ericspod]

Looks good now for these changes.

[KumoLiu]

/build