From e0b2fa1ff039f113dbba52c7d11f3182c3988f2b Mon Sep 17 00:00:00 2001
From: kenko911 <kenko911@gmail.com>
Date: Thu, 26 Sep 2024 18:24:16 -0700
Subject: [PATCH] fix black

---
 m3gnet/graph/_batch.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/m3gnet/graph/_batch.py b/m3gnet/graph/_batch.py
index 5d8958a..a8b969a 100644
--- a/m3gnet/graph/_batch.py
+++ b/m3gnet/graph/_batch.py
@@ -145,12 +145,12 @@ def _concatenate(list_of_arrays: List, name: AnyStr) -> Optional[np.ndarray]:
 
 @overload
 def assemble_material_graph(graphs: List[MaterialGraph]) -> MaterialGraph:
-    ...
+    raise NotImplementedError
 
 
 @overload
 def assemble_material_graph(graphs: List[List]) -> List:
-    ...
+    raise NotImplementedError
 
 
 def assemble_material_graph(graphs):