修复dpo报错

backend/app/engines/text_engine.py

@@ -650,7 +650,7 @@ class TextEngine(BaseEngine):
             }
 
         hf_dataset = HFDataset.from_list(raw_data)
-        tokenized = hf_dataset.map(tokenize_fn, batched=True, remove_columns=hf_dataset.column_names)
+        tokenized = hf_dataset.map(tokenize_fn, batched=True)
         return tokenized