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diff --git a/必备数学基础.md b/必备数学基础.md
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--- a/必备数学基础.md
+++ b/必备数学基础.md
@@ -1163,3 +1163,26 @@ https://scikit-learn.org/stable/auto_examples/
 
 **特征相关性**
 
+**预处理**
+
+**回归求解**
+
+上述notebook中的功能都集成在sklearn中，怎么用sklearn，
+<br>
+去到分类模型的页面https://scikit-learn.org/stable/modules/classes
+
+找到lasso点击进去
+
+![1605191482282](assets/1605191482282.png)
+
+可以看到其公式，及参数的默认值等
+
+![1605191568357](assets/1605191568357.png)
+
+使用小案例等
+
+![1605191615666](assets/1605191615666.png)
+
+具体的案例
+
+![1605191691043](assets/1605191691043.png)
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