Fix AttributeError: 'ChainCRF' object has no attribute 'inbound_nodes'

Author: Ismael Fernández

anago/layers.py

@@ -273,8 +273,8 @@ def compute_mask(self, input, mask=None):
 
     def _fetch_mask(self):
         mask = None
-        if self.inbound_nodes:
-            mask = self.inbound_nodes[0].input_masks[0]
+        if self._inbound_nodes:
+            mask = self._inbound_nodes[0].input_masks[0]
         return mask
 
     def build(self, input_shape):