单目3D初始代码

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

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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`
+
+!!! success "Improvements"
+
+    This page is sourced from [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/hub.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/hub.py). Have an improvement or example to add? Open a [Pull Request](https://docs.ultralytics.com/help/contributing/) — thank you! 🙏
+
+<br>
+
+## ::: ultralytics.utils.callbacks.hub.on_pretrain_routine_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_pretrain_routine_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_fit_epoch_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_model_save
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_train_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_train_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_val_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_predict_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.hub.on_export_start
+
+<br><br>