From 28690114fc7b8e35233901d66d45bbb07ae18019 Mon Sep 17 00:00:00 2001
From: "tiffany.duneau" <tiffany@incubiq.com>
Date: Mon, 21 Jul 2025 19:02:56 +0100
Subject: [PATCH] bugfix filepath creation for cached path tn optimizer

---
 lambeq/training/tn_path_optimizer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lambeq/training/tn_path_optimizer.py b/lambeq/training/tn_path_optimizer.py
index 377a1bc2..3babbedc 100644
--- a/lambeq/training/tn_path_optimizer.py
+++ b/lambeq/training/tn_path_optimizer.py
@@ -194,7 +194,7 @@ def __init__(
                     self.cached_paths = pickle.load(f)
             except FileNotFoundError:
                 # Make sure the path exists for future use.
-                self.filepath.mkdir(parents=True, exist_ok=True)
+                self.filepath.parent.mkdir(parents=True, exist_ok=True)
             except EOFError:
                 # No previous paths present; continue.
                 pass