compatible with old versions of modelscope (#671)

Author: tastelikefeet

swift/llm/utils/dataset.py

@@ -233,6 +233,8 @@ def load_ms_dataset(
         subset_name, split = subset_split
         dataset = MsDataset.load(
             dataset_id, subset_name=subset_name, split=split)
+        if hasattr(dataset, 'to_hf_dataset'):
+            dataset = dataset.to_hf_dataset()
         dataset_list.append(dataset)
     return concatenate_datasets(dataset_list)