architecture: YOLOv3
snapshot_epoch: 1
pretrain_weights: https://paddledet.bj.bcebos.com/models/pretrained/ResNeXt50_32x4d_pretrained.pdparams

YOLOv3:
  backbone: ResNet
  neck: FPN
  yolo_head: FCOSRHead
  post_process: ~

ResNet:
  depth: 50
  groups: 32
  base_width: 4
  variant: b
  norm_type: bn
  freeze_at: 0
  return_idx: [1,2,3]
  num_stages: 4

FPN:
  out_channel: 256
  extra_stage: 2
  has_extra_convs: true
  use_c5: false
  relu_before_extra_convs: true

FCOSRHead:
  feat_channels: 256
  fpn_strides: [8, 16, 32, 64, 128]
  stacked_convs: 4
  loss_weight: {class: 1.0, probiou: 1.0}
  assigner:
    name: FCOSRAssigner
    factor: 12
    threshold: 0.23
    boundary: [[-1, 64], [64, 128], [128, 256], [256, 512], [512, 100000000.0]]
  nms:
    name: MultiClassNMS
    nms_top_k: 2000
    keep_top_k: -1
    score_threshold: 0.1
    nms_threshold: 0.1
    normalized: False