About the vertical direction coordinate encoding in coord_handler.py about infinitygan HOT 3 CLOSED

It is to reduce the test-time numerical domain gap. The size difference between texture syn input and the structure syn input can be seen as kind of a pre-padding. And we want such region to be at the saturated region (0.995 to 1 after tanh) of tanh, and so that when we extrapolate vertical coordinates at testing, the coordinates wont be too far away from it's training distribution (~1).

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This figure may explain a bit of the concept, the red line is the result of the dividing by ss_spatial_size, and the green line is using the ts_spatial_size. Each color has three lines representing three different sizes of the features. The horizontal axis is the raw coordinate value, and the vertical axis is the value after tanh projection.

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OK, I got it. Thanks for the explanation.

from infinitygan.