Homogeneity test of covariance matrix (continued from the previous article)

I also know a little about the covariance homogeneity test, but I'm confused if I explain it more. This paper describes the covariance matrix test for two classification problems and the covariance matrix test for multiple classification problems Homogeneity test of covariance matrix for two classes Σ 1 is the covariance of category 1, ...

Posted on Fri, 03 Dec 2021 20:08:45 -0500 by mastercool

Data structure graph theory

DFS connected P352 connected component (undirected graph), strongly connected component (directed graph) pata1034 head of a gang Core code: void dfs( int u,int& head,int &numMember,int &totalvalue )//head, numMember and totalvalue change with each recursive dfs, but their final results are subject to the last recursive (without ...

Posted on Sat, 20 Nov 2021 00:57:06 -0500 by TimTimTimma

378. The K-th smallest element in an ordered matrix

378. The K-th smallest element in an ordered matrix Give you an n x n matrix, in which the elements of each row and column are sorted in ascending order to find the k-smallest element in the matrix. Note that it is the k-th smallest element after sorting, not the k-th different element. Input: matrix = [[1,5,9],[10,11,13],[12,13,15]], k = 8 ...

Posted on Fri, 19 Nov 2021 19:20:39 -0500 by apenster

How does YOLOv4 train its own dataset

Step 1: install darknet reference resources: Windows builds Darknet framework environment - yolov4 GPU_ Optimistic lishan blog - CSDN blog The source code description of darknet has also briefly introduced how to use data sets to train networks Step 2: create VOC format data set Collect the data set you need online, or take relevant videos ...

Posted on Fri, 19 Nov 2021 10:51:42 -0500 by XeroXer

Image preprocessing

Halcon Basics (I)_ leo_888's column - CSDN blog hom_mat2d_identity (HomMat2DIdentity) Explanation: define an identity matrix with diagonal 1, which is multiplied by any matrix equal to the original matrix itself. hom_mat2d_translate (HomMat2DIdentity, Tx, Ty, HomMat2DTranslate) Function: add translation to anti fire transformation matrix Homm ...

Posted on Tue, 09 Nov 2021 20:11:54 -0500 by rix

Collaborative filtering algorithm based on matrix decomposition

Implementation of CF algorithm based on matrix decomposition (I): LFM LFM is the Funk SVD matrix decomposition mentioned earlier Analysis of LFM principle The core idea of LFM (late factor model) implicit semantic model is to contact users and items through implicit features, as shown in the following figure: P matrix is user lf matri ...

Posted on Thu, 04 Nov 2021 05:41:34 -0400 by realchamp

Learning summary on September 15

Learning summary on September 15 1, Variable 1. Define multiple variables at the same time Define multiple variables at the same time and assign the same value: variable name 1 = variable name 2 = variable name 3 =... = data. x = y = z = 0 print(x, y, z) Define multiple variables at the same time and assign different values: variable nam ...

Posted on Sat, 16 Oct 2021 01:16:33 -0400 by gin

Figure -- 05 -- greedy algorithm, Prim algorithm, kruskal algorithm

Tip: after the article is written, the directory can be generated automatically. Please refer to the help document on the right for how to generate it Greedy Algorithm Greedy algorithm - Definition: Use the segmentation theorem to find one edge of the minimum spanning tree and repeat until all edges of the minimum spanning tree are ...

Posted on Sun, 10 Oct 2021 01:26:11 -0400 by delboy1978uk

MATLAB application practice series - nonlinear visualization - nonlinear phase diagram & chaotic system

preface The following are some boutique columns I have prepared for you. My favorite partners can subscribe by themselves. Your support is the driving force for me to update! MATLAB-30 days take you from introduction to mastery Advanced course for in-depth understanding of MATLAB (with source code) tableau visual data analysis advanced tuto ...

Posted on Sat, 09 Oct 2021 15:29:51 -0400 by blacklotus

Problem solving [NOIP2013_ match sorting] - problems and transformation

Problem solution_ NOIP2013_ Match sorting Meaning:   there are two sequences a and B, and the elements of each sequence are different. Any two adjacent elements of any sequence can be interchanged, and it is required to operate the two sequences so that ∑ ( ...

Posted on Fri, 08 Oct 2021 04:03:41 -0400 by standalone