Update fpn.py

Fixed the bug of ‘import paddlers’

paddlers/custom_models/seg/models/farseg/fpn.py

@@ -14,7 +14,7 @@
 
 from paddle import nn
 import paddle.nn.functional as F
-from seg.models.utils import (
+from ..utils import (
     ConvReLU, kaiming_normal_init, constant_init
 )
 
@@ -94,4 +94,4 @@ class LastLevelP6P7(nn.Layer):
         x = p5 if self.use_P5 else c5
         p6 = self.p6(x)
         p7 = self.p7(F.relu(p6))
-        return [p6, p7]
+        return [p6, p7]