diff --git a/function.py b/function.py
index ff5b9ff..f8da889 100644
--- a/function.py
+++ b/function.py
@@ -1,3 +1,17 @@
+import numpy as np
+
+"""
+请在这里填写学号和姓名，不填写即成绩无效。
+"""
+id = "202210423224"
+name = "吴杨洋"
+
+
+def sigmoid(z):
+    """
+    Sigmoid 激活函数。
+    """
+    return 1 / (1 + np.exp(-z))
 def train_logreg(X, y, random_state=42):
     model = LogisticRegression(solver='liblinear', random_state=random_state)
     model.fit(X, y)