yolov12/ultralytics/cfg/models/v12/yolov12.yaml

# YOLOv12 🚀, AGPL-3.0 license
# YOLOv12 object detection model with P3-P5 outputs. For Usage examples see https://docs.ultralytics.com/tasks/detect

# Parameters
nc: 80 # number of classes
scales: # model compound scaling constants, i.e. 'model=yolov12n.yaml' will call yolov12.yaml with scale 'n'
  # [depth, width, max_channels]
  n: [0.50, 0.25, 1024] # summary: 411 layers, 2,538,872 parameters, 2,538,856 gradients, 6.7 GFLOPs
  s: [0.50, 0.50, 1024] # summary: 411 layers, 8,986,272 parameters, 8,986,256 gradients, 22.0 GFLOPs
  m: [0.50, 1.00, 512] # summary: 541 layers, 19,918,024 parameters, 19,918,008 gradients, 69.7 GFLOPs
  l: [1.00, 1.00, 512] # summary: 917 layers, 28,329,872 parameters, 28,329,856 gradients, 97.2 GFLOPs
  x: [1.00, 1.50, 512] # summary: 917 layers, 63,190,624 parameters, 63,190,608 gradients, 216.5 GFLOPs


# YOLO12n backbone
backbone:
  # [from, repeats, module, args]
  - [-1, 1, Conv,  [64, 3, 2]] # 0-P1/2
  - [-1, 1, Conv,  [128, 3, 2]] # 1-P2/4
  - [-1, 2, C3k2,  [256, False, 0.25]]
  - [-1, 1, Conv,  [256, 3, 2]] # 3-P3/8
  - [-1, 2, C3k2,  [512, False, 0.25]]
  - [-1, 1, Conv,  [512, 3, 2]] # 5-P4/16
  - [-1, 4, A2C2f, [512, True, 4]]
  - [-1, 1, Conv,  [1024, 3, 2]] # 7-P5/32
  - [-1, 4, A2C2f, [1024, True, 1]]  # 8


# YOLO12n head
head:
  - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  - [[-1, 6], 1, Concat, [1]] # cat backbone P4
  - [-1, 2, A2C2f, [512, False, 4, True]] # 11

  - [-1, 1, nn.Upsample, [None, 2, "nearest"]]
  - [[-1, 4], 1, Concat, [1]] # cat backbone P3
  - [-1, 2, C3k2, [256, False]] # 14 (P3/8-small)

  - [-1, 1, Conv, [256, 3, 2]]
  - [[-1, 11], 1, Concat, [1]] # cat head P4
  - [-1, 2, A2C2f, [512, False, 4, True]] # 17 (P4/16-medium)

  - [-1, 1, Conv, [512, 3, 2]]
  - [[-1, 8], 1, Concat, [1]] # cat head P5
  - [-1, 2, C3k2, [1024, True]] # 20 (P5/32-large)

  - [[14, 17, 20], 1, Detect, [nc]] # Detect(P3, P4, P5)