Most users don’t clear their browser history as they will always want to find or revisit webpages long forgotten in the chaos of the World Wide Web. For multiple PC users, even with the many ...

The risk of importing the mosquito-borne chikungunya virus into Hong Kong is expected to rise, according to a senior health official, who has identified the increasing global prevalence of the disease ...

做机器人逆运动学（IK）的时候，你迟早会遇到矩阵指数和对数这些东西。为什么呢？因为计算三维旋转的误差，不能简单地用欧氏距离那一套，那只对位置有效。旋转得用另一套方法——你需要算两个旋转矩阵之间的差异，这就涉及到矩阵对数了。

对于神经网络来说，我们已经习惯了层状网络的思维：数据进来，经过第一层，然后第二层，第三层，最后输出结果。这个过程很像流水线，每一步都是离散的。