ultralytics-ascend/docs/reference/yolo/utils/callbacks/base.md

description	keywords
Learn about YOLO's callback functions from on_train_start to add_integration_callbacks. See how these callbacks modify and save models.	YOLO, Ultralytics, callbacks, object detection, training, inference

on_pretrain_routine_start

---

::: ultralytics.yolo.utils.callbacks.base.on_pretrain_routine_start

on_pretrain_routine_end

---

::: ultralytics.yolo.utils.callbacks.base.on_pretrain_routine_end

on_train_start

---

::: ultralytics.yolo.utils.callbacks.base.on_train_start

on_train_epoch_start

---

::: ultralytics.yolo.utils.callbacks.base.on_train_epoch_start

on_train_batch_start

---

::: ultralytics.yolo.utils.callbacks.base.on_train_batch_start

optimizer_step

---

::: ultralytics.yolo.utils.callbacks.base.optimizer_step

on_before_zero_grad

---

::: ultralytics.yolo.utils.callbacks.base.on_before_zero_grad

on_train_batch_end

---

::: ultralytics.yolo.utils.callbacks.base.on_train_batch_end

on_train_epoch_end

---

::: ultralytics.yolo.utils.callbacks.base.on_train_epoch_end

on_fit_epoch_end

---

::: ultralytics.yolo.utils.callbacks.base.on_fit_epoch_end

on_model_save

---

::: ultralytics.yolo.utils.callbacks.base.on_model_save

on_train_end

---

::: ultralytics.yolo.utils.callbacks.base.on_train_end

on_params_update

---

::: ultralytics.yolo.utils.callbacks.base.on_params_update

teardown

---

::: ultralytics.yolo.utils.callbacks.base.teardown

on_val_start

---

::: ultralytics.yolo.utils.callbacks.base.on_val_start

on_val_batch_start

---

::: ultralytics.yolo.utils.callbacks.base.on_val_batch_start

on_val_batch_end

---

::: ultralytics.yolo.utils.callbacks.base.on_val_batch_end

on_val_end

---

::: ultralytics.yolo.utils.callbacks.base.on_val_end

on_predict_start

---

::: ultralytics.yolo.utils.callbacks.base.on_predict_start

on_predict_batch_start

---

::: ultralytics.yolo.utils.callbacks.base.on_predict_batch_start

on_predict_batch_end

---

::: ultralytics.yolo.utils.callbacks.base.on_predict_batch_end

on_predict_postprocess_end

---

::: ultralytics.yolo.utils.callbacks.base.on_predict_postprocess_end

on_predict_end

---

::: ultralytics.yolo.utils.callbacks.base.on_predict_end

on_export_start

---

::: ultralytics.yolo.utils.callbacks.base.on_export_start

on_export_end

---

::: ultralytics.yolo.utils.callbacks.base.on_export_end

get_default_callbacks

---

::: ultralytics.yolo.utils.callbacks.base.get_default_callbacks

add_integration_callbacks

---

::: ultralytics.yolo.utils.callbacks.base.add_integration_callbacks