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* Autoinstall TensorRT if missing

May resolve https://github.com/ultralytics/yolov5/issues/7464

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* Refactor Docker files

* Refactor Docker files

* Update Dockerfile

* Added a way to skip dependency auto-installation.

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Follows https://github.com/ultralytics/yolov5/pull/7488. Correct bug where fonts were downloading to current working directory rather than global CONFIG_DIR

* Improved non-latin labels Annotator plotting

May resolve https://github.com/ultralytics/yolov5/issues/7460

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Bumps [cirrus-actions/rebase](https://github.com/cirrus-actions/rebase) from 1.5 to 1.6.
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* add fp16 for coreml using --half

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* Update `git_describe()`

Add .git path check to avoid `fatal: not a git repository (or any of the parent directories): .git` printout

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* Fix EdgeTPU output directory

Outputs to same directory as --weights

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* Dynamic normalization layer selection

Based on actual available layers. Torch 1.7 compatible, resolves https://github.com/ultralytics/yolov5/issues/7381

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* Update optimizer param group strategy

Avoid empty lists on missing BathNorm2d models as in https://github.com/ultralytics/yolov5/issues/7375

* fix init

Bumps [actions/stale](https://github.com/actions/stale) from 4 to 5.
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Remove keras==2.6.0 patch

Deleting as redundant with FUNDING.yml present in organization repo at https://github.com/ultralytics/.github

Eliminates all unsafe function in YOLOv5 out of an abundance of caution.

* Loss speed improvements

* bbox_iou speed improvements

* bbox_ioa speed improvements

* box_iou speed improvements

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* set common default stride as 32

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* Test exports

* Fix precommit

* Print dataset scan only `if RANK in (-1, 0)`

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* Simplify callbacks.py return

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Updated dataset size to 712GB (includes undeleted zips).