diff --git a/lib/gpt/core/einsum.py b/lib/gpt/core/einsum.py
index a59c3b5d..943353f4 100644
--- a/lib/gpt/core/einsum.py
+++ b/lib/gpt/core/einsum.py
@@ -166,14 +166,19 @@ def process_indices(names, values, epsilon_tensors, sign0):
                 index_value[j] = 0
 
     # now sort by target index
-    code = sorted(code, key = lambda c: c[1])
+    code = sorted(code, key=lambda c: c[1])
 
     # now verify that segmentation works
     assert len(code) % nsegment == 0
-    use_segmentation = all([len(set([c[1] for c in code[i:i+nsegment]])) == 1 for i in range(0, len(code), nsegment)])
+    use_segmentation = all(
+        [
+            len(set([c[1] for c in code[i : i + nsegment]])) == 1
+            for i in range(0, len(code), nsegment)
+        ]
+    )
     if not use_segmentation:
         nsegment = 1
-        
+
     # create segmentation
     segments = [(len(code) // nsegment, nsegment)]