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description: Explore Ultralytics YOLO Docs for a deep understanding of log_scalars, on_batch_end & other callback utilities embedded in the tensorboard module.
keywords: Ultralytics, YOLO, documentation, callback utilities, log_scalars, on_batch_end, tensorboard
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# Reference for `ultralytics/utils/callbacks/tensorboard.py`
!!! note
Full source code for this file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/tensorboard.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/callbacks/tensorboard.py). Help us fix any issues you see by submitting a [Pull Request](/help/contributing/) 🛠️. Thank you 🙏!
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## ::: ultralytics.utils.callbacks.tensorboard._log_scalars
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## ::: ultralytics.utils.callbacks.tensorboard.on_pretrain_routine_start
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## ::: ultralytics.utils.callbacks.tensorboard.on_batch_end
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## ::: ultralytics.utils.callbacks.tensorboard.on_fit_epoch_end
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