base model fix

src/aiunn/upsampler.py

@@ -14,16 +14,15 @@ class Upsampler(AIIA):
             mode=self.config.upsample_mode,
             align_corners=self.config.upsample_align_corners
         )
-        # Add a final conversion layer to change channels from 512 to 3.
-        self.to_rgb = nn.Conv2d(in_channels=512, out_channels=3, kernel_size=1)
+        # Conversion layer: change from 512 channels to 3 channels.
+        self.to_rgb = nn.Conv2d(in_channels=self.base_model.config.hidden_size, out_channels=3, kernel_size=1)
 
     def forward(self, x):
         x = self.base_model(x)
         x = self.upsample(x)
-        x = self.to_rgb(x)  # Convert feature map to RGB image.
+        x = self.to_rgb(x)  # Ensures output has 3 channels.
         return x
-
-
+    
     @classmethod
     def load(cls, path: str):
         """