hub.md - 0.vex_ai / yolov8-from github / docs / en / reference / utils / callbacks - 同济大学计算机视觉实验室学习

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hub.md

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0.vex_ai / yolov8-from github / docs / en / reference / utils / callbacks

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---
description: Explore detailed guides on Ultralytics callbacks, including pretrain, model save, train start/end, and more. Enhance your ML training workflows with ease.
keywords: Ultralytics, callbacks, pretrain, model save, train start, train end, validation, predict, export, training, machine learning
---
# Reference for `ultralytics/utils/callbacks/hub.py`
!!! note
This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/hub.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/hub.py). If you spot a problem please help fix it by [contributing](https://docs.ultralytics.com/help/contributing/) a [Pull Request](https://github.com/ultralytics/ultralytics/edit/main/ultralytics/utils/callbacks/hub.py) 🛠️. Thank you 🙏!

## ::: ultralytics.utils.callbacks.hub.on_pretrain_routine_start

## ::: ultralytics.utils.callbacks.hub.on_pretrain_routine_end

## ::: ultralytics.utils.callbacks.hub.on_fit_epoch_end

## ::: ultralytics.utils.callbacks.hub.on_model_save

## ::: ultralytics.utils.callbacks.hub.on_train_end

## ::: ultralytics.utils.callbacks.hub.on_train_start

## ::: ultralytics.utils.callbacks.hub.on_val_start

## ::: ultralytics.utils.callbacks.hub.on_predict_start

## ::: ultralytics.utils.callbacks.hub.on_export_start