The parameters of fpn must be given independently from the backbone.
Dynamic FPNs are free from
- the number and channels of pyramid-levels
- the size of input image, to decide each level's feature map size
- the strides between feature maps
# example1
fpn = FPN(num_levels=4,
in_channels=[64, 128, 128, 256],
out_channels=128,
sizes=[20, 10, 10, 5])
# example2
bifpn = BiFPN(num_levels=5,
num_repeat=3,
in_channels=[64, 128, 256],
out_channels=128,
sizes=[40, 20, 10, 4, 1],
strides=[2, 2, 2, 4])BSD 3-Clause License Copyright (c) 2022, hotcouscous1
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