Category : Mathematics
LightOJ 1027 & LightOJ 1395: Expectation
Two versions of a expectation problem, solved using properties of expectations of random variables and dynamic programming. Read more
Support Vector Machines
We could use KNN, logistic regression, LDA, and decision trees for classification problems. Here we discuss a new set of methods: the maximal margin classifier, the support vector classifier, and the support vector machine, which are often loosely referred to as “support vector machines”. Read more
Tree-Based Methods
Recall that we use step functions, where the range of predictor $X$ is broken into several bins and in each bin the average of the observed response, certainly a constant, is used as the prediction. Step functions can be viewed as a special case of tree-based methods, the latter of which could be applied to multiple predictors. Read more
Non-Linear Models
Linear models, including linear regression and models making improvements on it, can only offer a limited approximation of the real world. Therefore, moving beyond linearity is necessitated in various situations where more flexibility is required. Read more
洛谷P4316题解：拓扑排序+条件概率
题目链接 这两天在看概率论，所以写一下这题更数学的理解方式。 Read more
一篇简短的离散微积分
一直在看Coursera上宾夕法尼亚大学的微积分课。前两天才看到Discrete Calculus那一节，发现非常有趣，对于探讨函数和数列的一些内在联系非常有启发性，此文略记一二。 Read more