JingyunLiang / SwinIR

SwinIR: Image Restoration Using Swin Transformer (official repository)

Home Page:https://arxiv.org/abs/2108.10257

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About Resi-connection

mushding opened this issue · comments

Hi there, thanks for the amazing work!
In the section 'Impact of residual connection and convolution layer in RSTB' of the paper said that would add a 1x1 conv or 3x3 conv at the residual connection.
the result shows that 3x3 is better than 1x1, also the inverted-bottleneck 3x3.

back to the code itself.
when I first read the 'resi_connection' argument in SwinIR class, I thought that '1conv' means 1x1 conv and '3conv' means 3x3 conv
after a while reading more code, I realized that '1conv' actually means 'one 3x3 conv' and '3conv' means 'three 3x3 conv'.

# build the last conv layer in deep feature extraction
if resi_connection == '1conv':
    self.conv_after_body = nn.Conv2d(embed_dim, embed_dim, 3, 1, 1)
elif resi_connection == '3conv':
    # to save parameters and memory
    self.conv_after_body = nn.Sequential(nn.Conv2d(embed_dim, embed_dim // 4, 3, 1, 1),
                                         nn.LeakyReLU(negative_slope=0.2, inplace=True),
                                         nn.Conv2d(embed_dim // 4, embed_dim // 4, 1, 1, 0),
                                         nn.LeakyReLU(negative_slope=0.2, inplace=True),
                                         nn.Conv2d(embed_dim // 4, embed_dim, 3, 1, 1))

I think the way of naming could be a little bit confusing.
It could be better if it calls '1conv3' '3conv3' or something else.

just want to tell you the confusing part.
thanks.

Sorry for the confusion. We will fix it later. Thank you!

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