Load a language model and decode with it during evaluation

Based on !346 (merged)

Closes #252 (closed)

dan/ocr/manager/training.py

@@ -72,11 +72,11 @@ class GenericTrainingManager:
         self.load_dataset()
 
     @property
-    def encoder(self):
+    def encoder(self) -> FCN_Encoder | None:
         return self.models.get(MODEL_NAME_ENCODER)
 
     @property
-    def decoder(self):
+    def decoder(self) -> GlobalHTADecoder | None:
         return self.models.get(MODEL_NAME_DECODER)
 
     def init_paths(self):