摘要: Normal Equation Note: [8:00 to 8:44 - The design matrix X (in the bottom right side of the slide) given in the example should have elements x with sub 阅读全文
posted @ 2017-08-06 23:14 ne-zha 阅读(674) 评论(0) 推荐(0)
摘要: Features and Polynomial Regression We can improve our features and the form of our hypothesis function in a couple different ways. We can combine mult 阅读全文
posted @ 2017-08-06 17:20 ne-zha 阅读(185) 评论(0) 推荐(0)
摘要: Gradient Descent in Practice I - Feature Scaling(特征尺度) 调整处理X的范围,以提高梯度下降效果和减小迭代次数,加快了下降速度。 Note: [6:20 - The average size of a house is 1000 but 100 is 阅读全文
posted @ 2017-08-06 17:07 ne-zha 阅读(323) 评论(0) 推荐(0)