Fixes

flash/image/segmentation/heads.py

@@ -56,8 +56,8 @@ def _get_backbone_meta(backbone):
             backbone = backbone.features
             # Gather the indices of blocks which are strided. These are the locations of C1, ..., Cn-1 blocks.
             # The first and last blocks are always included because they are the C0 (conv1) and Cn.
-            stage_indices = ([0] + [i for i, b in enumerate(backbone) if getattr(b, "_is_cn", False)] +
-                             [len(backbone) - 1])
+            stage_indices = [i for i, b in enumerate(backbone) if getattr(b, "_is_cn", False)]
+            stage_indices = [0] + stage_indices + [len(backbone) - 1]
             out_pos = stage_indices[-1]  # use C5 which has output_stride = 16
             out_layer = str(out_pos)
             out_inplanes = backbone[out_pos].out_channels