单目3D初始代码

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

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+---
+description: Discover the essential base callbacks in Ultralytics for training, validation, prediction, and exporting models efficiently.
+keywords: Ultralytics, base callbacks, training, validation, prediction, model export, ML, machine learning, deep learning
+---
+
+# Reference for `ultralytics/utils/callbacks/base.py`
+
+!!! success "Improvements"
+
+    This page is sourced from [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/base.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/base.py). Have an improvement or example to add? Open a [Pull Request](https://docs.ultralytics.com/help/contributing/) — thank you! 🙏
+
+<br>
+
+## ::: ultralytics.utils.callbacks.base.on_pretrain_routine_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_pretrain_routine_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_train_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_train_epoch_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_train_batch_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.optimizer_step
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_before_zero_grad
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_train_batch_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_train_epoch_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_fit_epoch_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_model_save
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_train_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_params_update
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.teardown
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_val_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_val_batch_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_val_batch_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_val_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_predict_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_predict_batch_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_predict_batch_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_predict_postprocess_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_predict_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_export_start
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.on_export_end
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.get_default_callbacks
+
+<br><br><hr><br>
+
+## ::: ultralytics.utils.callbacks.base.add_integration_callbacks
+
+<br><br>