Created by: zhengzhe97

ResNet:
  norm_type: bn
  depth: 200
  feature_maps: [2, 3, 4, 5]
  freeze_at: 2
  variant: d
  dcn_v2_stages: [3, 4, 5]
  nonlocal_stages: [4]

FPN:
  min_level: 2
  max_level: 6
  num_chan: 256
  spatial_scale: [0.03125, 0.0625, 0.125, 0.25]

FPNRPNHead:
  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]
  anchor_start_size: 32

在oidv5中的CascadeRCNN的配置文件中生成的anchor对每个FPN返回的特征层都提供15个anchor，还是每层只提供3个anchor。还有想请问下这边的anchor_start_size这个参数具体的用途。