Make Stable Cascade work on old pytorch 2.0

comfy/ldm/cascade/stage_a.py

@@ -150,7 +150,11 @@ class ResBlock(nn.Module):
         mods = self.gammas
 
         x_temp = self._norm(x, self.norm1) * (1 + mods[0]) + mods[1]
-        x = x + self.depthwise(x_temp) * mods[2]
+        try:
+            x = x + self.depthwise(x_temp) * mods[2]
+        except: #operation not implemented for bf16
+            x_temp = self.depthwise[0](x_temp.float()).to(x.dtype)
+            x = x + self.depthwise[1](x_temp) * mods[2]
 
         x_temp = self._norm(x, self.norm2) * (1 + mods[3]) + mods[4]
         x = x + self.channelwise(x_temp.permute(0, 2, 3, 1)).permute(0, 3, 1, 2) * mods[5]