diff --git a/function.py b/function.py
index ec5c940..12891e2 100644
--- a/function.py
+++ b/function.py
@@ -107,7 +107,7 @@ def img_to_vector(filename):
     Returns:
     - np.array: 二值图像向量。
     """
-     with open(filename, 'r') as f:
+    with open(filename, 'r') as f:
         return np.array([int(char) for char in f.read().strip()]).reshape(1, -1)