For n elements x1, x2, ..., xn with positive integer weights w1, w2, ..., wn. The weighted median is the element xk satisfying  and   , S indicates   Can you compute the weighted median in O(n) worst-case?   Input There are several test cases. For ea…

四年前第一次看到<100+ Times FasterWeighted Median Filter (WMF)>一文时,因为他附带了源代码,而且还是CVPR论文,因此,当时也对代码进行了一定的整理和解读,但是当时觉得这个算法虽然对原始速度有不少的提高,但是还是比较慢.因此,没有怎么在意,这几天有几位朋友又提到这篇文章,于是把当时的代码和论文又仔细的研读了一番,对论文的思想和其中的实现也有了一些新的新的,再次做个总结和分享. 这篇文章的官网地址是:http://www.cse.cuhk.edu.h…

A.angry_birds_again_and_again 简单积分: http://acm.sdut.edu.cn/sdutoj/problem.php?action=showproblem&problemid=2877 给定曲线,给定一个点,求从曲线上某点到x轴上某点直线恰为曲线切线和曲线围成的面积. 水题,求积分做就好了,但是开始还错了,回车竟然判成WR而不是PR,第一题就卡,醉了... #include<cstdio> #include<cstring> #incl…

This article come from HEREARS-L1: Learning Tuesday 10:30–12:30; Oral Session; Room: Leonard de Vinci 10:30  ARS-L1.1—GROUP STRUCTURED DIRTY DICTIONARY LEARNING FOR CLASSIFICATION Yuanming Suo, Minh Dao, Trac Tran, Johns Hopkins University, USA; Hojj…

题目链接:http://acm.sdut.edu.cn/sdutoj/contest_show.php?contest_id=1449 相关总结:http://www.cnblogs.com/mcflurry/p/3724649.html#3395978 排名:http://acm.sdut.edu.cn/sd2012/2014.htm A.angry_birds_again_and_again(定积分) B.Circle(高斯消元?/递推) C.Colorful Cupcakes(dp?) D…

class sklearn.ensemble.AdaBoostRegressor(base_estimator=None, n_estimators=50, learning_rate=1.0, loss='linear',random_state=None)[source] An AdaBoost regressor. An AdaBoost [1] regressor is a meta-estimator that begins by fitting a regressor on the…

前期处理 perl脚本统计RC(RC(read counts)) 读入control baseline 和 sigma(最后baseline 预测的mad值) 将gc < 0.28或gc > 0.68,sigma乘上1.5,后来又乘以6,对于小于0.01或者大于0.99分位数,sigma取0.01和0.99分位点的sigma 将sigma转化为权重,SigmaForWeights = 1/sigma^2/max(1/sigmaforWeithts^2) 根据mu值设置一些outlier的amp…

香港中文大学研究成果 Rolling Guidance Filter http://www.cse.cuhk.edu.hk/~leojia/projects/rollguidance/ 100+ Times Faster Weighted Median Filter http://www.cse.cuhk.edu.hk/~leojia/projects/fastwmedian/index.html Mutual-Structure for Joint Filtering http://www.c…

最近发了两片patch match的,其实自己也是有一些一知半解的,找了一篇不知道谁的大论文看了看,又回顾了一下,下面贴我的笔记. The PatchMatch Algorithm patchmatch一开始被应用于结构化的图片编辑. 是一个随机性的算法. 致力于找到近似的最近领匹配. patchmatch的假设: 邻近的像素有一样的模型参数\(p\in R^n\) 有一个cost function可以计算给定一个\(p\)的代价 PatchMatch三大步: 随机初始化 传播 随机搜索 Pat…

鲁棒局部加权回归 [转载时请注明来源]:http://www.cnblogs.com/runner-ljt/ Ljt 作为一个初学者,水平有限,欢迎交流指正. 算法参考文献: (1) Robust Locally Weighted Regression and Smoothing Scatterplots (Willism_S.Cleveland) (2) 数据挖掘中强局部加权回归算法实现 (虞乐,肖基毅) R实现 #Robust Locally Weighted Regression 鲁棒局部…

问题: There are two sorted arrays nums1 and nums2 of size m and n respectively.Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). Example1:nums1 = [1, 3]nums2 = [2]The median is 2.0Example2:nums1 = [1, 2]n…

Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two middle value. Examples: [2,3,4] , the median is 3 [2,3], the median is (2 + 3) / 2 = 2.5 Design a d…

There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). 这道题让我们求两个有序数组的中位数,而且限制了时间复杂度为O(log (m+n)),看到这个时间复杂度,自然而然的想到了应该使用二分查找法来求解.但是这道题…

前言: 最近想看看矢量中值滤波(Vector median filter, VMF)在GRB图像上的滤波效果,意外的是找了一大圈却发现网上没有现成的code,所以通过matab亲自实现了一个,需要学习的朋友可以拿过去用.本文的核心是VMF的matlab实现,最后通过在RGB图像上应用举例说明. VMF的数学表达: 含有N个矢量的集合{C1,C2,...CN},它的VMF结果如下所示: 其中,CVM1表示距离所有其他向量的距离和最小的那个向量.而距离可以自己定义,常用的欧氏距离,曼哈顿距离等等.…

T1加权成像(T1-weighted imaging,T1WI)是指这种成像方法重点突出组织纵向弛豫差别,而尽量减少组织其他特性如横向弛豫等对图像的影响. 弛豫:物理用语,从某一个状态恢复到平衡态的过程. 主要对比度决定于组织间或组织状态间T1差别的磁共振图像.采用短TR(<500ms)和短TE(<25ms)的扫描序列来取得.取短TR进行扫描时,脂肪等短T1组织尚可充分弛豫,而脑脊液等长T1组织在给定TR时间内的弛豫量相对较少.因此,它们在下个RF脉冲出现时对能量的吸收程度也就不同:短T1组织…

题目简述: There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). 解题思路: 这本身是个很简单的题目,但是题目要求他的复杂度为O(log(m+n)),就很有难度了.不过首先我们还是可以明确我们要用分治法.关键是怎么分治呢?我们…

B. Rebranding The name of one small but proud corporation consists of n lowercase English letters. The Corporation has decided to try rebranding — an active marketing strategy, that includes a set of measures to change either the brand (both for the…

欠拟合.过拟合 如下图中三个拟合模型.第一个是一个线性模型,对训练数据拟合不够好,损失函数取值较大.如图中第二个模型,如果我们在线性模型上加一个新特征项,拟合结果就会好一些.图中第三个是一个包含5阶多项式的模型,对训练数据几乎完美拟合. 模型一没有很好的拟合训练数据,在训练数据以及在测试数据上都存在较大误差,这种情况称之为欠拟合(underfitting). 模型三对训练数据拟合的很不错,但是在测试数据上的准确度并不理想.这种对训练数据拟合较好,而在测试数据上准确度较低的情况称之为过拟合(ove…

https://leetcode.com/problems/median-of-two-sorted-arrays/ There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). Example 1: nums1 =…

常规方法 超时 class MedianFinder { vector<int> coll; public: MedianFinder(){ } void heapfu(vector<int>& coll,int idx,int max){ int left=2*idx+1,right=2*idx+2; int largest=idx; if(left<max&&coll[left]>coll[idx]) largest=left; if(rig…

题目如下:(https://leetcode.com/problems/find-median-from-data-stream/) Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two middle value. Examples: [2,3,4] …

题目 There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). Example 1: nums1 = [1, 3] nums2 = [2] The median is 2.0 Example 2: nums1 =…

There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). Example 1: nums1 = [1, 3] nums2 = [2] The median is 2.0 Example 2: nums1 = [1,…

https://leetcode.com/problems/median-of-two-sorted-arrays/ There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). Example 1: nums1 =…

一道非常经典的题目,Median of Two Sorted Arrays.(PS:leetcode 我已经做了 190 道,欢迎围观全部题解 https://github.com/hanzichi/leetcode) 题意非常简单,给定两个有序的数组,求中位数,难度系数给的是 Hard,希望的复杂度是 log 级别.回顾下中位数,对于一个有序数组,如果数组长度是奇数,那么中位数就是中间那个值,如果长度是偶数,就是中间两个数的平均数. O(nlogn) 最容易想到的解法是 O(nlogn) 的解…

Given 17 arrays,every array is ascending.The task is to get the median of all these numbers. 0 1 2 3 4           this is an array with 5 elements,the median is (5/2). 0 1 2 3 4 5        this is an array with 6 elements,the median is (6/2). If we inde…

平均值mean,众数mode,中值median 和 标准差stddev 均值,众数,中位数,标称差: 均值是就全部数据计算的,它具有优良的数学性质,是实际中应用最广泛的集中趋势测度值.其主要缺点是易受数据极端值的影响,对于偏态分布的数据,均值的代表性较差.作为均值变形的调和平均数和几何平均数,是适用于特殊数据的代表值,调和平均数主要用于不能直接计算均值的数据,几何平均数则主要用于计算比率数据的平均数,这两个测度值与均值一样易受极端值的影响. 一般代表算术平均值.也就是:比如 众数是一组数据分布的…

There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). 将两个有序数组合并,注意题目求得是the median of the two sorted array, 当m+n是奇数时返回的是合并后的中间数即C[(m+n)/2] 当m…

There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. Have you met this question in a real interview?     Example Given A=[1,2,3,4,5,6] and B=[2,3,4,5], the median is 3.5. Given A=[1,2,3] and B=[4…

18.9 Numbers are randomly generated and passed to a method. Write a program to find and maintain the median value as new values are generated. LeetCode上的原题,请参见我之前的博客Find Median from Data Stream. 解法一: priority_queue<int> small; priority_queue<int,…