finish exp3 predict code

exp3/modified/dataset.py

@@ -233,6 +233,10 @@ class PoetryDataLoader:
     def get_vocab_size(self) -> int:
         """一个便捷的获取vocab_size的函数，避免层层调用"""
         return self.preprocessor.tokenizer.vocab_size
+    
+    def get_tokenizer(self) -> Tokenizer:
+        """一个便捷的获取Tokenizer的函数，避免层层调用"""
+        return self.preprocessor.tokenizer
 
     def __collect_fn(self, batch: list[list[int]]) -> tuple[torch.Tensor, torch.Tensor]:
         """