diff --git a/read_data.py b/read_data.py
index 8b7851e..907771e 100644
--- a/read_data.py
+++ b/read_data.py
@@ -103,7 +103,13 @@ class TagIdConverter:
     @property
     def pad_id(self):
         return self.vocab["[PAD]"]
+    @property
+    def size(self):
+        return len(self.vocab)
     
+    def __len__(self):
+        return self.size
+
     def convert_ids_to_tokens(self,ids: List[int]):
         return [self.ids_to_token[id] for id in ids]
     def convert_tokens_to_ids(self, tokens: List[str]):