why input shape is (None, 512, 512, 1)?

[youkaichao]

I load the mod and print mod.InputLayers[0].input_shape and get the (None, 512, 512, 1).
But the code in main.py indicates that the input shape should be [None, 512, 512, 3] or [3, 512, 512, None] depending on the data format.
When I feed [3, 512, 512, batch_size] or [batch_size, 512, 512, 3] to mod.predict, Exception is raised.
Can you help me ? What's going on here?

[lllyasviel]

has been checked in group.