diff --git a/python/graphscope/learning/gs_graph_store.py b/python/graphscope/learning/gs_graph_store.py
index d6e9cf071a50..4ead40529539 100644
--- a/python/graphscope/learning/gs_graph_store.py
+++ b/python/graphscope/learning/gs_graph_store.py
@@ -119,7 +119,7 @@ def _get_edge_index(self, edge_attr: EdgeAttr) -> Optional[EdgeTensorType]:
 
         Args:
             edge_attr(`EdgeAttr`): Uniquely corresponds to a topology of subgraph .
-        
+
         Returns:
             edge_index(`EdgeTensorType`): The edge index tensor, which is a :class:`tuple` of\
             (row indice tensor, column indice tensor)(COO)\