From 618e550f062ea04aff7803cf3e0087c1f811b78d Mon Sep 17 00:00:00 2001
From: Christophe Bornet <cbornet@hotmail.com>
Date: Thu, 23 Jan 2025 19:09:07 +0100
Subject: [PATCH] core: Cache RunnableLambda deps (#29200)

`RunnableLambda`'s `deps` may do costly OS operation by calling
`get_function_nonlocals`.
So it's better to cache it.
See #29043
---
 libs/core/langchain_core/runnables/base.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/core/langchain_core/runnables/base.py b/libs/core/langchain_core/runnables/base.py
index 4ad7c04a739c8..9942174103c3e 100644
--- a/libs/core/langchain_core/runnables/base.py
+++ b/libs/core/langchain_core/runnables/base.py
@@ -4457,7 +4457,7 @@ def get_output_schema(
             module_name=module,
         )
 
-    @property
+    @functools.cached_property
     def deps(self) -> list[Runnable]:
         """The dependencies of this Runnable.