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1.监督学习 监督学习（supervised learning）擅长在“给定输入特征”的情况下预测标签。 每个“特征-标签”对都称为一个样本（example）。 整个监督学习过程如图所示。 图 监督学习 1.1回归 回归（regression）是最简单的监督学习任务之一。当标签取任意数值时，我们称之 阅读全文
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The difference between undergraudate and postgraduate? The undergraduate education provides foundational knowledge and skills in a broad discipline. T 阅读全文
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c++中如何判断一个浮点数是否为0？ 判断是否在一个误差范围内: cpp const float eps = 1e-6; if(abs(x) < eps) { // x is nearly zero } 舍入到整数再判断: cpp float x = 0.00001; if(round(x) == 阅读全文
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题目： In the big cities, the subway systems always look so complex to the visitors. To give you some sense, the following figure shows the map of Beijin 阅读全文
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题目： Cutting an integer means to cut a K digits lone integer Z into two integers of (K/2) digits long integers A and B. For example, after cutting Z = 阅读全文
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题目： There is a kind of balanced binary search tree named red-black tree in the data structure. It has the following 5 properties: (1) Every node is ei 阅读全文
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题目： Consider a positive integer N written in standard notation with k+1 digits ai as ak⋯a1a0 with 0≤ai<10 for all i and ak>0. Then N is palindro 阅读全文
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题目： For a student taking the online course "Data Structures" on China University MOOC (http://www.icourse163.org/), to be qualified for a certificate, 阅读全文
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题目： Suppose that all the keys in a binary tree are distinct positive integers. Given the preorder and inorder traversal sequences, you are supposed to 阅读全文
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题目： After each PAT, the PAT Center will announce the ranking of institutions based on their students' performances. Now you are asked to generate the 阅读全文