* add more docs

* add more docs

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* Implementation of Early Stopping for DDP training

This edit correctly uses the broadcast_object_list() function to send slave processes a boolean so to end the training phase if the variable is True, thus allowing the master process to destroy the process group and terminate.

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* Further cleanup

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* Fix ONNX `--dynamic` export on GPU

Patch forces --dynamic export model and image to CPU. Resolves bug raised in https://github.com/ultralytics/yolov5/issues/8377

* Update export.py

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.
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* Add filesize to benchmarks.py

* Add filesize to benchmarks.py

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Per https://github.com/ultralytics/yolov5/issues/8352

* Create README_cn.md

Add mandarin version of README

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Display device_name="MYRIAD" for Intel NCS2 option per user question in https://github.com/ultralytics/yolov5/issues/8154

Improve DDP console response in https://github.com/ultralytics/yolov5/issues/8283

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* HUB dataset_stats() error reporting

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* Update dataloaders.py

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Negatively impacts YouTube inference but removes any lag on webcams/RTSP/RTMP etc.

Resolves https://github.com/ultralytics/yolov5/issues/4465

* Reject webcam inference on Colab/Kaggle

Improve user error understanding for https://github.com/ultralytics/yolov5/issues/8180

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* cleanup

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Bumps [actions/setup-python](https://github.com/actions/setup-python) from 3 to 4.
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* AutoBatch checks against failed solutions

@kalenmike this is a simple improvement to AutoBatch to verify that returned solutions have not already failed, i.e. return batch-size 8 when 8 already produced CUDA out of memory.

This is a halfway fix until I can implement a 'final solution' that will actively verify the solved-for batch size rather than passively assume it works.

* Update autobatch.py

* Update autobatch.py

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* experimental.py Apple MPS fix

May resolve https://github.com/ultralytics/yolov5/issues/8102

* Update experimental.py

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* Improved dataset error introspection

Intended to help https://github.com/ultralytics/yolov5/issues/8090

* Update general.py