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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 |
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| # Reference for `ultralytics/utils/callbacks/hub.py` |
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| !!! Note |
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| 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 🙏! |
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| ## ::: ultralytics.utils.callbacks.hub.on_pretrain_routine_start |
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| <br><br><hr><br> |
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| ## ::: ultralytics.utils.callbacks.hub.on_pretrain_routine_end |
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| <br><br><hr><br> |
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| ## ::: ultralytics.utils.callbacks.hub.on_fit_epoch_end |
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| <br><br><hr><br> |
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| ## ::: ultralytics.utils.callbacks.hub.on_model_save |
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| <br><br><hr><br> |
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| ## ::: ultralytics.utils.callbacks.hub.on_train_end |
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| <br><br><hr><br> |
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| ## ::: ultralytics.utils.callbacks.hub.on_train_start |
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| <br><br><hr><br> |
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| ## ::: ultralytics.utils.callbacks.hub.on_val_start |
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| <br><br><hr><br> |
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| ## ::: ultralytics.utils.callbacks.hub.on_predict_start |
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| <br><br><hr><br> |
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| ## ::: ultralytics.utils.callbacks.hub.on_export_start |
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| <br><br> |
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