Up3 - Transpose conv has kernel size (1,1)

[dvorst]

In Up3, the tranpose conv has kernel size (1,1). From what i know this is quite uncommon, is there a reason why this isn't (2,2) or (4,4) ?

MSRF-Net/model.py

Line 121 in 60e2373

up = Conv2DTranspose(int(input1.shape[-1]),(1, 1), strides=(2, 2), padding='same')(input2)