image_size = 300.0
layer_boxes = [4, 6, 6, 6, 4, 4] 
classes = 80
box_ratios = [1.0, 1.0, 2.0, 3.0, 0.5, 1.0/3.0]
conv4_3_ratios = [1.0, 0.5, 2.0]
conv4_3_box_scale = 0.07
box_s_min = 0.1
negposratio = 3

# to be set programmatically
out_shapes = None
defaults = None