The general principle is we want both a simple and predictive model. The tradeoff between the two is also referred as bias-variance tradeoff in machine learning.

• 0 范数，向量中非零元素的个数。
• 1 范数，为绝对值之和。$||\beta||$
• 2 范数，就是通常意义上的模。${||\beta||}^2$

(>看完记得五星好评哦亲<)
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