architecture: FasterRCNN
use_gpu: true
max_iters: 180000
log_iter: 50
save_dir: output
snapshot_iter: 10000
pretrain_weights: https://paddlemodels.bj.bcebos.com/object_detection/dygraph/resnet50.pdparams
metric: COCO
weights: output/faster_rcnn_r50_1x/model_final
num_classes: 81
open_debug: False

# Model Achitecture
FasterRCNN:
  # model anchor info flow
  anchor: AnchorRPN
  proposal: Proposal
  # model feat info flow
  backbone: ResNet
  rpn_head: RPNHead
  bbox_head: BBoxHead

ResNet:
  depth: 50
  norm_type: 'affine'
  freeze_at: 'res2'

RPNHead:
  rpn_feat:
    name: RPNFeat
    feat_in: 1024
    feat_out: 1024
  anchor_per_position: 15

BBoxHead:
  bbox_feat:
    name: BBoxFeat
    roi_extractor:
      name: RoIExtractor
      resolution: 14
      sampling_ratio: 0
      spatial_scale: 0.0625
      extractor_type: 'RoIAlign'
    feat_out: 512

AnchorRPN:
  anchor_generator:
    name: AnchorGeneratorRPN
    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]
  anchor_target_generator:
    name: AnchorTargetGeneratorRPN
    batch_size_per_im: 256
    fg_fraction: 0.5
    negative_overlap: 0.3
    positive_overlap: 0.7
    straddle_thresh: 0.0

Proposal:
  proposal_generator:
    name: ProposalGenerator
    min_size: 0.0
    nms_thresh: 0.7
    train_pre_nms_top_n: 12000
    train_post_nms_top_n: 2000
    infer_pre_nms_top_n: 12000 # used in infer
    infer_post_nms_top_n: 2000 # used in infer
    return_rois_num: True
  proposal_target_generator:
    name: ProposalTargetGenerator
    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_thresh: [0.5,]
    fg_fraction: 0.25
  bbox_post_process: # used in infer
    name: BBoxPostProcess
    # decode -> clip -> nms
    decode_clip_nms:
      name: DecodeClipNms
      keep_top_k: 100
      score_threshold: 0.05
      nms_threshold: 0.5

# Train
LearningRate:
  base_lr: 0.01
  schedulers:
  - !PiecewiseDecay
    gamma: 0.1
    milestones: [120000, 160000]
  - !LinearWarmup
    start_factor: 0.3333333333333333
    steps: 500

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

_READER_: 'faster_reader.yml'