--- description: Learn about YOLO's callback functions from on_train_start to add_integration_callbacks. See how these callbacks modify and save models. --- # 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