* Add `on_train_start()` callback

* Update

* Update

* Add `retry=3` to `download()`

* Update general.py

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Simplify code.

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* fix: disable usage of root logger

`logging.basicConfig` configures Python's root logger. This prohibits
fine control of logging, overwrites logging configuration done outside
the package, and is not best practice. Instead, the used logger is now
configured directly, and the root logger is untouched.

Example:
    If yolov5 is used as part of another project with some sophisticated
    logging, the internal `logging.basicConfig` call overwrites all the
    external configuration.

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Add  `check_requirements(('pycocotools>=2.0',))`

Improved error messages for understanding of user error with val.py. May help https://github.com/ultralytics/yolov5/issues/7291

* Flask context manager `open()` fix

* Additional read context manager fixes

* enable TensorFlow ops if flag --nms or --agnostic-nms is used

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* [pre-commit.ci] pre-commit suggestions

updates:
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- [github.com/pre-commit/mirrors-yapf: v0.31.0 → v0.32.0](https://github.com/pre-commit/mirrors-yapf/compare/v0.31.0...v0.32.0)

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Eliminate 1 op during training and inference.

* Update

* Update

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* Update

* Update time_limit

* Update restapi.py

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* Cleanup

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Resolve `UserWarning: Usage of dash-separated 'description-file' will not be supported in future versions. Please use the underscore name 'description_file' instead`

* Fix `www.youtube.com` hostname

* Update datasets.py

* SavedModel TF Serve Fix

Fix for https://github.com/ultralytics/yolov5/issues/7205 proposed by @tylertroy

* Update export.py

* CLI fire prep updates

* revert unintentional TF export change

* precommit: yapf

* align isort

* fix

# Conflicts:
#	utils/plots.py

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* simplify colorstr

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* PyTorch Hub tuple fix

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Automatically names run as --cfg argument

* yolo.py profiling updates

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Bumps [actions/cache](https://github.com/actions/cache) from 2.1.7 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](https://github.com/actions/cache/compare/v2.1.7...v3)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...
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