---
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
---

## _log_scalars
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### ::: ultralytics.utils.callbacks.tensorboard._log_scalars
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## on_pretrain_routine_start
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### ::: ultralytics.utils.callbacks.tensorboard.on_pretrain_routine_start
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## on_batch_end
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### ::: ultralytics.utils.callbacks.tensorboard.on_batch_end
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## on_fit_epoch_end
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### ::: ultralytics.utils.callbacks.tensorboard.on_fit_epoch_end
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