From 9b6d52e6281a11ee25a4b731ea736a4485432614 Mon Sep 17 00:00:00 2001
From: huchenlei <chenlei.hu@mail.utoronto.ca>
Date: Mon, 4 Mar 2024 12:31:47 -0500
Subject: [PATCH] Python 3.8 compatible

---
 lib_layerdiffusion/utils.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib_layerdiffusion/utils.py b/lib_layerdiffusion/utils.py
index 6e1b8ab..008e464 100644
--- a/lib_layerdiffusion/utils.py
+++ b/lib_layerdiffusion/utils.py
@@ -4,6 +4,8 @@ import cv2
 import torch
 import os
 from urllib.parse import urlparse
+from typing import Optional
+
 
 def rgba2rgbfp32(x):
     rgb = x[..., :3].astype(np.float32) / 255.0
@@ -94,7 +96,7 @@ def load_file_from_url(
     *,
     model_dir: str,
     progress: bool = True,
-    file_name: str | None = None,
+    file_name: Optional[str] = None,
 ) -> str:
     """Download a file from `url` into `model_dir`, using the file present if possible.