Fix module before __init__ bug

map2map/models/conv.py

@@ -1,3 +1,4 @@
+import warnings
 import torch
 import torch.nn as nn
 
@@ -84,20 +85,31 @@ class ResBlock(ConvBlock):
     `out_chan` even if it equals `in_chan`.
 
     A trailing `'A'` in seq can either operate before or after the addition,
-    depending on the boolean value of `last_act`.
+    depending on the boolean value of `last_act`, defaulting to `seq[-1] == 'A'`
 
     See `ConvBlock` for `seq` types.
     """
     def __init__(self, in_chan, out_chan=None, mid_chan=None,
-                 seq='CBACBA', last_act=True):
+                 seq='CBACBA', last_act=None):
-        if seq[-1] == 'A' and last_act:
+        if last_act is None:
+            last_act = seq[-1] == 'A'
+        elif last_act and seq[-1] != 'A':
+            warnings.warn(
+                'Disabling last_act without trailing activation in seq',
+                RuntimeWarning,
+            )
+            last_act = False
+
+        if last_act:
             seq = seq[:-1]
+
+        super().__init__(in_chan, out_chan=out_chan, mid_chan=mid_chan, seq=seq)
+
+        if last_act:
             self.act = nn.LeakyReLU()
         else:
             self.act = None
 
-        super().__init__(in_chan, out_chan=out_chan, mid_chan=mid_chan, seq=seq)
-
         if out_chan is None:
             self.skip = None
         else: