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description: Browse through Ultralytics YOLO docs to learn about important logging and callback functions used in training and pretraining models.
keywords: Ultralytics, YOLO, callbacks, logger, training, pretraining, machine learning, models
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# Reference for `ultralytics/utils/callbacks/dvc.py`

!!! note

    Full source code for this file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/dvc.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/dvc.py). Help us fix any issues you see by submitting a [Pull Request](https://docs.ultralytics.com/help/contributing/) 🛠️. Thank you 🙏!

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## ::: ultralytics.utils.callbacks.dvc._log_images
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## ::: ultralytics.utils.callbacks.dvc._log_plots
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## ::: ultralytics.utils.callbacks.dvc._log_confusion_matrix
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## ::: ultralytics.utils.callbacks.dvc.on_pretrain_routine_start
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## ::: ultralytics.utils.callbacks.dvc.on_pretrain_routine_end
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## ::: ultralytics.utils.callbacks.dvc.on_train_start
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## ::: ultralytics.utils.callbacks.dvc.on_train_epoch_start
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## ::: ultralytics.utils.callbacks.dvc.on_fit_epoch_end
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## ::: ultralytics.utils.callbacks.dvc.on_train_end
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