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

# Reference for `ultralytics/models/sam2/modules/sam2_blocks.py`

!!! Note

    This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/sam2/modules/sam2_blocks.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/sam2/modules/sam2_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/sam2/modules/sam2_blocks.py) 🛠️. Thank you 🙏!

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## ::: ultralytics.models.sam2.modules.sam2_blocks.DropPath

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## ::: ultralytics.models.sam2.modules.sam2_blocks.MaskDownSampler

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## ::: ultralytics.models.sam2.modules.sam2_blocks.CXBlock

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## ::: ultralytics.models.sam2.modules.sam2_blocks.Fuser

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## ::: ultralytics.models.sam2.modules.sam2_blocks.TwoWayAttentionBlock

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## ::: ultralytics.models.sam2.modules.sam2_blocks.TwoWayTransformer

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## ::: ultralytics.models.sam2.modules.sam2_blocks.RoPEAttention

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## ::: ultralytics.models.sam2.modules.sam2_blocks.MultiScaleAttention

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## ::: ultralytics.models.sam2.modules.sam2_blocks.MultiScaleBlock

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## ::: ultralytics.models.sam2.modules.sam2_blocks.PositionEmbeddingSine

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## ::: ultralytics.models.sam2.modules.sam2_blocks.do_pool

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