fix hashing

rembg/detect.py

@@ -27,11 +27,15 @@ def ort_session(model_name: str) -> ort.InferenceSession:
     home = os.getenv("U2NET_HOME", os.path.join("~", ".u2net"))
     path = Path(home).expanduser() / f"{model_name}.onnx"
     path.parents[0].mkdir(parents=True, exist_ok=True)
-    if path.exists():
-        hashing = hashlib.new("md5", path.read_bytes(), usedforsecurity=False)
-    if not path.exists() or hashing.hexdigest() != md5:
+
+    if not path.exists():
         with redirect_stdout(sys.stderr):
             gdown.download(url, str(path), use_cookies=False)
+    else:
+        hashing = hashlib.new("md5", path.read_bytes(), usedforsecurity=False)
+        if hashing.hexdigest() != md5:
+            with redirect_stdout(sys.stderr):
+                gdown.download(url, str(path), use_cookies=False)
 
     return ort.InferenceSession(str(path), providers=ort.get_available_providers())