---
description: Detailed guide on the Ultralytics YOLO WorldTrainer class, including methods for fine-tuning world models and dataset building.
keywords: Ultralytics, YOLO, WorldTrainer, WorldModel, training, dataset, machine learning, AI, deep learning, computer vision, ViT-B/32, clip
---

# Reference for `ultralytics/models/yolo/world/train.py`

!!! Note

    This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/yolo/world/train.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/yolo/world/train.py). If you spot a problem please help fix it by [contributing](/help/contributing.md) a [Pull Request](https://github.com/ultralytics/ultralytics/edit/main/ultralytics/models/yolo/world/train.py) 🛠️. Thank you 🙏!

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## ::: ultralytics.models.yolo.world.train.WorldTrainer

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## ::: ultralytics.models.yolo.world.train.on_pretrain_routine_end

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