In [1]:
import numpy as np

In [4]:
img = np.random.rand(600,800)
img.shape


Out[4]:
(600, 800)

In [5]:
stride = 16
print(600/16, 800/16)
# 39x51


37.5 50.0

In [6]:
# 17901 anchor
39*51*9


Out[6]:
17901

In [ ]: