From 5c6e12375732ebdaa971401f936b2f7783d61679 Mon Sep 17 00:00:00 2001
From: Serena Ruan <82044803+serena-ruan@users.noreply.github.com>
Date: Tue, 23 Jan 2024 19:09:02 -0800
Subject: [PATCH] community[patch]: Fix MlflowCallback with none artifacts_dir
 (#16487)

---
 libs/community/langchain_community/callbacks/mlflow_callback.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/community/langchain_community/callbacks/mlflow_callback.py b/libs/community/langchain_community/callbacks/mlflow_callback.py
index 577532a3616..4070d17d61c 100644
--- a/libs/community/langchain_community/callbacks/mlflow_callback.py
+++ b/libs/community/langchain_community/callbacks/mlflow_callback.py
@@ -275,7 +275,7 @@ class MlflowCallbackHandler(BaseMetadataCallbackHandler, BaseCallbackHandler):
         tags: Optional[Dict] = None,
         tracking_uri: Optional[str] = None,
         run_id: Optional[str] = None,
-        artifacts_dir: Optional[str] = None,
+        artifacts_dir: str = "",
     ) -> None:
         """Initialize callback handler."""
         import_pandas()