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---
description: Learn about Ultralytics transformer encoder, layer, MLP block, LayerNorm2d and the deformable transformer decoder layer. Expand your understanding of these crucial AI modules.
keywords: Ultralytics, Ultralytics documentation, TransformerEncoderLayer, TransformerLayer, MLPBlock, LayerNorm2d, DeformableTransformerDecoderLayer
---
# Reference for `ultralytics/nn/modules/transformer.py`
!!! note
This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/nn/modules/transformer.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/nn/modules/transformer.py). If you spot a problem please help fix it by [contributing](https://docs.ultralytics.com/help/contributing/) a [Pull Request](https://github.com/ultralytics/ultralytics/edit/main/ultralytics/nn/modules/transformer.py) 🛠. Thank you 🙏!
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## ::: ultralytics.nn.modules.transformer.TransformerEncoderLayer
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## ::: ultralytics.nn.modules.transformer.AIFI
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## ::: ultralytics.nn.modules.transformer.TransformerLayer
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## ::: ultralytics.nn.modules.transformer.TransformerBlock
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## ::: ultralytics.nn.modules.transformer.MLPBlock
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## ::: ultralytics.nn.modules.transformer.MLP
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## ::: ultralytics.nn.modules.transformer.LayerNorm2d
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## ::: ultralytics.nn.modules.transformer.MSDeformAttn
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## ::: ultralytics.nn.modules.transformer.DeformableTransformerDecoderLayer
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## ::: ultralytics.nn.modules.transformer.DeformableTransformerDecoder
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