faster_rcnn_r50_vd_1x.yml

architecture: FasterRCNN
use_gpu: true
max_iters: 180000
log_iter: 20
save_dir: output/faster-r50-vd-c4-1x
snapshot_iter: 10000
pretrain_weights: https://paddle-imagenet-models-name.bj.bcebos.com/ResNet50_vd_pretrained.tar
metric: COCO
weights: output/faster_rcnn_r50_vd_1x/model_final
num_classes: 81

FasterRCNN:
  backbone: ResNet
  rpn_head: RPNHead
  roi_extractor: RoIAlign
  bbox_head: BBoxHead
  bbox_assigner: BBoxAssigner

ResNet:
  norm_type: affine_channel
  depth: 50
  feature_maps: 4
  freeze_at: 2
  variant: d

ResNetC5:
  depth: 50
  norm_type: affine_channel
  variant: d

RPNHead:
  anchor_generator:
    anchor_sizes: [32, 64, 128, 256, 512]
    aspect_ratios: [0.5, 1.0, 2.0]
    stride: [16.0, 16.0]
    variance: [1.0, 1.0, 1.0, 1.0]
  rpn_target_assign:
    rpn_batch_size_per_im: 256
    rpn_fg_fraction: 0.5
    rpn_negative_overlap: 0.3
    rpn_positive_overlap: 0.7
    rpn_straddle_thresh: 0.0
    use_random: true
  train_proposal:
    min_size: 0.0
    nms_thresh: 0.7
    pre_nms_top_n: 12000
    post_nms_top_n: 2000
  test_proposal:
    min_size: 0.0
    nms_thresh: 0.7
    pre_nms_top_n: 6000
    post_nms_top_n: 1000

RoIAlign:
  resolution: 14
  sampling_ratio: 0
  spatial_scale: 0.0625

BBoxAssigner:
  batch_size_per_im: 512
  bbox_reg_weights: [0.1, 0.1, 0.2, 0.2]
  bg_thresh_hi: 0.5
  bg_thresh_lo: 0.0
  fg_fraction: 0.25
  fg_thresh: 0.5

BBoxHead:
  head: ResNetC5
  nms:
    keep_top_k: 100
    nms_threshold: 0.5
    score_threshold: 0.05

LearningRate:
  base_lr: 0.01
  schedulers:
  - !PiecewiseDecay
    gamma: 0.1
    milestones: [120000, 160000]
  - !LinearWarmup
    start_factor: 0.1
    steps: 1000

OptimizerBuilder:
  optimizer:
    momentum: 0.9
    type: Momentum
  regularizer:
    factor: 0.0001
    type: L2

_READER_: 'faster_reader.yml'