Why output of torch.cat() is still C channels??

[Johnson-yue]

BMSG-GAN/sourcecode/MSG_GAN/CustomLayers.py

Line 342 in d063169

# [B x C x H x W] Append as new feature_map.

I think input feature x , the shape of x is (BS, C, H, W)
and the shape of y is (BS, 1, H, W)
so the output of concate them should be (BS, C+1, H, W), but (BS, C, H, W) in code ?