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docs/en/reference/utils/callbacks/hub.md

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+---
+description: Explore the detailed information on key Ultralytics callbacks such as on_pretrain_routine_end, on_model_save, on_train_start, and on_predict_start.
+keywords: 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
+
+    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 🙏!
+
+<br><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_pretrain_routine_end
+
+<br><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_fit_epoch_end
+
+<br><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_model_save
+
+<br><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_train_end
+
+<br><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_train_start
+
+<br><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_val_start
+
+<br><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_predict_start
+
+<br><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_export_start
+
+<br><br>