Fix keys of Xinference deployed models, especially has the same model name with public hosted models. (#2832)

### What problem does this PR solve?

Fix keys of Xinference deployed models, especially has the same model
name with public hosted models.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: 0000sir <0000sir@gmail.com>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

sdk/python/ragflow/ragflow.py

@@ -74,6 +74,12 @@ class RAGFlow:
         if res.get("code") != 0:
             raise Exception(res["message"])
 
+    def get_dataset(self,name: str):
+        _list = self.list_datasets(name=name)
+        if len(_list) > 0:
+            return _list[0]
+        raise Exception("Dataset %s not found" % name)
+
     def list_datasets(self, page: int = 1, page_size: int = 1024, orderby: str = "create_time", desc: bool = True,
                       id: str = None, name: str = None) -> \
             List[DataSet]: