auto set chat template

Former-commit-id: d8bf2f0efe6919990c7032aaa06010980cfde019

src/llmtuner/data/loader.py

@@ -156,6 +156,9 @@ def get_dataset(
                 dataset = dataset.to_iterable_dataset()
             return dataset
 
+        if data_args.streaming:
+            raise ValueError("Turn off `streaming` when saving dataset to disk.")
+
     with training_args.main_process_first(desc="load dataset"):
         all_datasets = []
         for dataset_attr in get_dataset_list(data_args):