Phab2 Pro体验 & Tango技术简介
最近入手了联想的Phab2 Pro,作为“全球首款搭载Tango技术的智能手机”,还是挺让人期待的,先来几张真机实拍:

![back.JPG](http://ata2-img.cn-h
l2约束的最小二乘学习法
ℓ2\ell_{2}constrained least squares
In the simple least squares, noisy samples may lead to overfitting learning output. Therefore, it is rational to constrain the space of parameters.
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