text: import numpy as np
  
  from vision.utils.box_utils import SSDSpec, SSDBoxSizes, generate_ssd_priors
  
  
  image_size = 300
  image_mean = np.array([127, 127, 127])  # RGB layout
  #image_mean = np.array([127])  # RGB layout
  image_std = 128.0
  iou_threshold = 0.45
  center_variance = 0.1
  size_variance = 0.2
  
  specs = [
      SSDSpec(19, 16, SSDBoxSizes(60, 105), [2, 3]),
      SSDSpec(10, 32, SSDBoxSizes(105, 150), [2, 3]),
      SSDSpec(5, 64, SSDBoxSizes(150, 195), [2, 3]),
      SSDSpec(3, 100, SSDBoxSizes(195, 240), [2, 3]),
      SSDSpec(2, 150, SSDBoxSizes(240, 285), [2, 3]),
      SSDSpec(1, 300, SSDBoxSizes(285, 330), [2, 3])
  ]
  
  
  priors = generate_ssd_priors(specs, image_size)
  