构建推荐系统的关键点在于学习有效的交叉特征。特征的交叉一般通过哈达玛积来表示，比如x1表示性别，男、女；x2表示是否喜欢体育；x1&x2联合特征，会有4种取值。...
Paper：Optimized Cost per Click in Taobao Display Advertising
CVR转化率预估过程中存在样本选择偏差和数据稀疏问题。这两个问题在阿里的上一篇论文ESMM中有提到，这里介绍一下。
You are given an n x n 2D matrix representing an image, rotate the image by 90 d...
Given a collection of distinct integers, return all possible permutations.
Given an array of non-negative integers, you are initially positioned at the fir...
接收者操作特征曲线（ROC）可以用来对分类器的表现可视化，可以依据分类器在ROC上的表现来选择最终的模型。
Given two non-negative integers num1 and num2 represented as strings, return the...
Given n non-negative integers representing an elevation map where the width of e...
因子分解机Factorization Machine的提出是对标SVM和矩阵分解，如SVD++、PITF、FPMC模型。
Given an unsorted integer array, find the smallest missing positive integer.
Given a collection of candidate numbers (candidates) and a target number (target...
Given a set of candidate numbers (candidates) (without duplicates) and a target ...
Write a program to solve a Sudoku puzzle by filling the empty cells.
预测post-click转换率CVR在排序系统如推荐系统、广告中是至关重要的。传统的CVR模型使用深度学习方法已经实现到state-of-the-art水平。但...
Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be valid...
淘宝作为世界上最大的电商平台，每天为上百万的广告主提供十亿多在线广告曝光的机会。从商业目的上说，广告主为特定的场景和目标人群进行竞标以竞争商业流量。平台方在十毫...
Given a sorted array and a target value, return the index if the target is found...
Given an array of integers nums sorted in ascending order, find the starting and...
Suppose an array sorted in ascending order is rotated at some pivot unknown to y...
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