Chan124a

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![网页捕获_19-12-2021_105437_paddlepedia readthedocs io](https://user-images.githubusercontent.com/20662862/146663914-d4a88939-c17b-4431-954e-15005666e0de.jpeg) 图里公式的两个不等号写反了,如果按照图里的假设,beta_2应该为[0,1]