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[Fix] Update 2.md 1.1.1.1. formula
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Update 2.md 1.1.1.1. formula, add link to pic
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wanroywolf authored Jul 7, 2020
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### 1.1.1.1. 普通最小二乘法的复杂度
{% endraw %}

该方法使用 X 的奇异值分解来计算最小二乘解。如果 X 是一个形状为 `(n_samples, n_features)`的矩阵,设 $$ n_{samples} \geq n_{features} $$ , 则该方法的复杂度为 $$ O(n_{samples} n_{fearures}^2) $$
该方法使用 X 的奇异值分解来计算最小二乘解。如果 X 是一个形状为 `(n_samples, n_features)`的矩阵,设![n_{samples} \geq n_{features}](img/1.1.1.1.(1).jpg), 则该方法的复杂度为![O(n_{samples} n_{fearures}^2)](img/1.1.1.1.(2).jpg)

{% raw %}
## 1.1.2. 岭回归
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