YOLOv8-16bit/docs/reference/nn/modules/block.md

---
description: Explore Ultralytics YOLO neural network modules, Proto to BottleneckCSP. Detailed explanation of each module with easy-to-follow code examples.
keywords: YOLO, Ultralytics, neural network, nn.modules.block, Proto, HGBlock, SPPF, C2, C3, RepC3, C3Ghost, Bottleneck, BottleneckCSP
---

# Reference for `ultralytics/nn/modules/block.py`

!!! note

    Full source code for this file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/nn/modules/block.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/nn/modules/block.py).

---
## ::: ultralytics.nn.modules.block.DFL
<br><br>

---
## ::: ultralytics.nn.modules.block.Proto
<br><br>

---
## ::: ultralytics.nn.modules.block.HGStem
<br><br>

---
## ::: ultralytics.nn.modules.block.HGBlock
<br><br>

---
## ::: ultralytics.nn.modules.block.SPP
<br><br>

---
## ::: ultralytics.nn.modules.block.SPPF
<br><br>

---
## ::: ultralytics.nn.modules.block.C1
<br><br>

---
## ::: ultralytics.nn.modules.block.C2
<br><br>

---
## ::: ultralytics.nn.modules.block.C2f
<br><br>

---
## ::: ultralytics.nn.modules.block.C3
<br><br>

---
## ::: ultralytics.nn.modules.block.C3x
<br><br>

---
## ::: ultralytics.nn.modules.block.RepC3
<br><br>

---
## ::: ultralytics.nn.modules.block.C3TR
<br><br>

---
## ::: ultralytics.nn.modules.block.C3Ghost
<br><br>

---
## ::: ultralytics.nn.modules.block.GhostBottleneck
<br><br>

---
## ::: ultralytics.nn.modules.block.Bottleneck
<br><br>

---
## ::: ultralytics.nn.modules.block.BottleneckCSP
<br><br>