摘要：1. Variable definitions : training examples' count $X$ : design matrix. each row of $X$ is a training example, each column of $X$ is a feature $$X = \ 阅读全文

摘要：1. Variable definitions : training examples' count $y$ : $X$ : design matrix. each row of $X$ is a training example, each column of $X$ is a feature $ 阅读全文