---
description: Explore detailed documentation of various SAM and SAM 2 modules such as MaskDownSampler, CXBlock, and more, available in Ultralytics' repository.
keywords: Ultralytics, SAM encoder, SAM 2 encoder, DropPath, MaskDownSampler, CXBlock, Fuser, TwoWayTransformer, TwoWayAttentionBlock, RoPEAttention, MultiScaleAttention, MultiScaleBlock. PositionEmbeddingSine, do_pool
---

# Reference for `ultralytics/models/sam/modules/blocks.py`

!!! Note

    This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/sam/modules/blocks.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/sam/modules/blocks.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/models/sam/modules/blocks.py) 🛠️. Thank you 🙏!

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## ::: ultralytics.models.sam.modules.blocks.DropPath

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## ::: ultralytics.models.sam.modules.blocks.MaskDownSampler

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## ::: ultralytics.models.sam.modules.blocks.CXBlock

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## ::: ultralytics.models.sam.modules.blocks.Fuser

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## ::: ultralytics.models.sam.modules.blocks.SAM2TwoWayAttentionBlock

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## ::: ultralytics.models.sam.modules.blocks.SAM2TwoWayTransformer

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## ::: ultralytics.models.sam.modules.blocks.RoPEAttention

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## ::: ultralytics.models.sam.modules.blocks.MultiScaleAttention

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## ::: ultralytics.models.sam.modules.blocks.MultiScaleBlock

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## ::: ultralytics.models.sam.modules.blocks.PositionEmbeddingSine

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## ::: ultralytics.models.sam.modules.blocks.PositionEmbeddingRandom

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## ::: ultralytics.models.sam.modules.blocks.Block

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## ::: ultralytics.models.sam.modules.blocks.REAttention

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## ::: ultralytics.models.sam.modules.blocks.PatchEmbed

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## ::: ultralytics.models.sam.modules.blocks.do_pool

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