Signed Number Representation and Bitwise Operation
Signed Number RepresentationRepresenting numbers is an interesting topic. Intuitively, we can represent the numbers in many different ways. However, when it comes to the digital world, in computer...
View ArticleClik here to view.
围棋，围棋
小时候，大家都会上一些兴趣班陶冶情操，有人学乐器，有人学体育，我学围棋。一转眼十几年，当年背的棋谱口诀都已记不得，思维也略迟钝，算不清未来的若干步。没想到儿时的情愫竟在异国拾起。“有约不来过夜半，闲敲棋子落灯花。”和学弟大战到凌晨，我执白。最后，白83 vs...
View ArticleClik here to view.
记一则面试
今天面了一个小公司，投的data scientist，90分钟，满满都是情怀。面试官面试完后，当场给feedback，把所有题的正确解答又给我讲了一遍！情怀爆表令人感动！首先，面试官简直是个BUG，大写的，嗯。BUG = 高中美国国家IOI对的。S大9年从本科到博士。本科ACM，G code jam, top coder都是finalist。博士三年两拿top conf的best...
View ArticleClik here to view.
AAAI 2016
时隔4年再次和老板一起开会😂😂😂再次给见到了的和没见到的各位大哥问好🙏🙏🙏参观了世界著名学府ASU！太高大上！楼下各种商店，酒吧，餐馆，不愧的party...
View ArticleClik here to view.
SDM 2016
赶着大好的天气大好的时光，大家从天南海北汇赶到这片文化匮乏的大陆的东南角，一起吃吃饭，唠唠嗑，顺便聊聊research，也是一件极好的事情。真心感谢Southbeach Data...
View ArticleConvex Function And Its Three Equivalent Statements
Convex function such that convex, andfor 0 \leq t \leq 1 and all .If is differentiable on , then the following statements are equivalent:(a) f is convex(b) for all (c) for all x, y \in \mathbb{R}^nThe...
View ArticleLocal minima are global minima in convex optimization.
Probably, everyone in or partially in machine learning or data mining heard about the quote “There is no local minima for convex problem.” Today I would like to show the mathematical proof of this...
View ArticleFirst-Order Optimality Condition
I will continue the notation I used in previous post.The convex optimization problems are defined as follows:Here, for notational brevity, the convex optimization problems can be expressed in the...
View ArticleStrong Convexity and Their Four Equivalent Conditions
Strongly convex is convex with parameter .In words, is at least as convex as a quadratic function.
View Article