Update utils_extra.py

Author: bonlime

efficientnet/utils_extra.py

@@ -80,7 +80,7 @@ def forward(self, x):
         top = extra_v // 2
         bottom = extra_v - top
 
-        x = F.pad(x, [left, right, top, bottom])
+        x = F.pad(x, [left, right, top, bottom], value=-float("inf"))
 
         x = self.pool(x)
         return x