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<p>又到了年经贴的时候了。。。。2016的个人总结<br>
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<p>没想到学校返学费反的这么快。。。。本来以为十一没钱没出去玩真是失策。。。。。闲得无聊只能开脑洞了。</p>
<p>大部分的修仙世界都有洞天福地、仙界、天劫什么的。但是我觉得自然界的形成本身是一件非常美丽和对称的事情，尤其是物理和数学，随处可见这种美，而仙界、天劫的设定显然违背了这种自然的美。所以我们从几个假设出发，开始推导这一切的形成过程(手动滑稽)<br>
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<p>kaggle 经验<br>
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<p>部分的看完了数值优化和凸优化，觉得数学方面暂时不需要更多的补充了，所以重启了很久以前的6.824。16年的6.824没有 paxos ，换成了 raft 。但是本着一切分布式一致性协议都是 paxos 变种的思想，还是毅然决然的去做了下15年的 paxos 实验，居然一天就过了所有的 test。想想看去年，做了4，5天都没过啊。。。。。怕以后忘了，所以总结一下。<br>
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QP问题
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<p>QP问题，即带线性约束的二次方程最小化问题。QP问题的一般形式为：<br><span>$$\label{origin}
\min_x\ q(x) = \frac{1}{2}x^TGx+x^Tc\\
s.t.\ a^T_ix = b_i,\quad i\in\mathcal{E}\\
a^T_ix \ge b_i,\quad i\in\mathcal{I}$$</span><!-- Has MathJax --><br>对于 Hessian 矩阵 <span>$G$</span><!-- Has MathJax --> 来说，如果是半正定的，则QP称为凸QP；否则称为非凸QP。显然，非凸QP问题更麻烦一些。不过我们这里只关注凸QP问题。<br>
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