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Explore the detailed information on key Ultralytics callbacks such as on_pretrain_routine_end, on_model_save, on_train_start, and on_predict_start. Ultralytics, callbacks, on_pretrain_routine_end, on_model_save, on_train_start, on_predict_start, hub, training

Reference for ultralytics/utils/callbacks/hub.py

!!! note

Full source code for 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). Help us fix any issues you see by submitting a [Pull Request](https://docs.ultralytics.com/help/contributing/) 🛠. Thank you 🙏!

::: 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