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Fixing numerical instabilities at long skip connections #31

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Fixing numerical instabilities at long skip connections #31

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4 changes: 3 additions & 1 deletion libs/uvit.py
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Original file line number Diff line number Diff line change
Expand Up @@ -97,6 +97,7 @@ class Block(nn.Module):
def __init__(self, dim, num_heads, mlp_ratio=4., qkv_bias=False, qk_scale=None,
act_layer=nn.GELU, norm_layer=nn.LayerNorm, skip=False, use_checkpoint=False):
super().__init__()
self.norm_skip = norm_layer(2*dim) if skip else None
self.norm1 = norm_layer(dim)
self.attn = Attention(
dim, num_heads=num_heads, qkv_bias=qkv_bias, qk_scale=qk_scale)
Expand All @@ -114,7 +115,8 @@ def forward(self, x, skip=None):

def _forward(self, x, skip=None):
if self.skip_linear is not None:
x = self.skip_linear(torch.cat([x, skip], dim=-1))
skip_in_ = self.norm_skip(torch.cat([x, skip], dim=-1)) if self.norm_skip is not None else torch.cat([x, skip], dim=-1)
x = self.skip_linear(skip_in_)
x = x + self.attn(self.norm1(x))
x = x + self.mlp(self.norm2(x))
return x
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