diff --git a/function.py b/function.py
index bceba38..512ed4d 100644
--- a/function.py
+++ b/function.py
@@ -78,14 +78,26 @@ def load_data(filepath):
     """
     data = []
     labels = []
+    columns = []
     with open(filepath, 'r') as f:
         lines = f.readlines()
         for line in lines:
             line = line.strip().split()
-            line_data = [1] + [float(i) for i in line[:-1]]
+            if not columns:
+                columns = line[:-1]
+            line_data = [1] + [float(x) if x!= '?' else 0 for x in line[:-1]]
             data.append(line_data)
             labels.append(int(line[-1]))
-    return np.array(data), np.array(labels)
+
+    data = np.array(data)
+    for i in range(1, data.shape[1]):
+        col = data[:, i]
+        valid_values = col[col!= 0]
+        if len(valid_values) > 0:
+            mean_value = np.mean(valid_values)
+            data[col == 0, i] = mean_value
+
+    return data, np.array(labels)
 
 if __name__ == "__main__":
     # 以下代码可用于测试，可自行随意修改