Tag：case
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Time：2021-10-19
MapReduce can calculate very complex aggregation logic and is very flexible. However, MapReduce is very slow and should not be used in real-time data analysis. MapReduce can be executed in parallel on multiple servers. Each server is only responsible for completing part of the wordload. Finally, the wordload is sent to the master server for […]
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Time：2021-10-7
1： Background 1. Tell a story I’ve written several real cases about memory inflation in succession. I’m a little numb. Let’s share one for a changeCPU burst heightSome time ago, a friend found me on Wx and said that he often received an old projectCPU > 90%The alarm information is very embarrassing. Now that you […]
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Time：2021-10-2
Original link:http://tecdat.cn/?p=10997 Simulated false data set set.seed(0820) n <- 50 p <- 25 beta <- rep(0,p) beta\[1:5\] <- 1:5/5 X <- matrix(rnorm(n*p),n,p) X <- scale(X) Xb <- X%*%beta Y <- X%*%beta+rnorm(n) Y <- Y-mean(Y) plot(cor(X,Y),xlab=”j”,ylab=”Cor(Y,X_j)”,main=”Sample correlations”,cex=2) Standard least square method summary(ols) ## ## Call: ## ## Residuals: ## Min 1Q Median 3Q Max ## -2.54540 -0.38971 -0.00738 0.49058 1.90900 ## ## Coefficients: ## Estimate Std. Error t value Pr(>|t|) ## (Intercept) -3.914e-16 1.648e-01 0.000 1.00000 ## X1 6.020e-01 2.097e-01 2.871 0.00841 ** ## X2 5.924e-01 2.013e-01 2.944 0.00709 ** ## X3 -1.106e-01 2.290e-01 -0.483 0.63363 ## X4 1.117e+00 2.058e-01 5.427 1.42e-05 *** ## X5 1.234e+00 2.190e-01 5.633 8.46e-06 *** ## X6 -3.225e-01 2.322e-01 -1.389 0.17755 ## X7 -1.954e-01 2.150e-01 -0.909 0.37231 ## X8 1.466e-01 2.532e-01 0.579 0.56803 ## X9 4.678e-02 2.353e-01 0.199 0.84409 ## X10 -2.779e-01 2.151e-01 -1.292 0.20864 ## X11 -7.308e-02 2.553e-01 -0.286 0.77717 ## X12 -4.424e-02 2.642e-01 -0.167 0.86839 ## X13 -1.078e-01 2.101e-01 -0.513 0.61270 ## X14 3.000e-01 2.263e-01 1.326 0.19743 ## X15 2.396e-01 2.480e-01 0.966 0.34365 ## X16 -1.178e-01 2.285e-01 -0.515 0.61100 ## X17 -2.409e-01 2.280e-01 -1.057 0.30104 ## X18 -3.191e-01 2.396e-01 -1.332 0.19551 ## X19 -1.207e-01 2.372e-01 -0.509 0.61553 ## X20 1.721e-01 2.179e-01 0.790 0.43733 ## X21 -1.677e-02 2.144e-01 -0.078 0.93831 ## X22 3.706e-02 2.145e-01 0.173 0.86426 ## X23 3.233e-02 2.108e-01 0.153 0.87938 […]
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Time：2021-10-1
Wechat search【Fried fish in my head】Pay attention to this fried fish with fried liver. this paperGitHubGithub.com/eddycjy/blog has been included, including my series of articles, materials and open source go books. Hello, I’m fried fish. Some time ago, when I was frantically writing code, a reader suddenly asked me a question, which made me interested: I’m […]
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Time：2021-9-24
Conditional statement part Circular statements: Yes 1.REPEAT Statement until conditional expression executed until the conditional expression is true END REPEAT;** 2.WHILE Conditional expression DO Series of statements END WHILE The difference between the while loop statement and the repeat loop control statement is that the former will not execute the loop body once the conditions are not […]
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Time：2021-9-20
preface The previous section mentioned that the pod created directly has no self-healing function. The pod created by the controller can be self-healing, so what is the controller. It can be understood that the container is a bare box. Pod packed the box to facilitate k8s mounting. How to mount several pods in k8s at […]
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Time：2021-9-20
Talk to youBFCYour understanding? What is it? Written explanation:BFC (Block Formatting Context）These are in English Block: block can be understood here asBlock-level Box, refers to the standard for block level boxes Formatting context: block level context formatting, which is a rendering area in the page and has a set of rendering rules, which determines how […]
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Time：2021-9-18
Introduction: application of dataX in data migration DataX definition =========== First, briefly introduce what dataX is.DataX is an offline data synchronization tool / platform widely used in Alibaba group. It realizes efficient data synchronization between various heterogeneous data sources, including mysql, Oracle, sqlserver, postgre, HDFS, hive, ads, HBase, tablestore (OTS), maxcompute (ODPs), DRDS, etc. DataX […]
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Time：2021-9-10
1.3 springboot case implementation Case requirements: request the method in the controller and respond the return value to the page (1) Build a spring boot project using spring initializr In essence, spring initializr is a web application. It provides a basic project structure and can help us quickly build a basic spring boot project Project […]
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Time：2021-8-30
I wanted to share the small games I had made for you very early (super simple), but I haven’t had a chance. I have nothing to do today. I’ll serve you a dish. The code is not very difficult. I hope all the friends who read this article can write it by themselves in the […]
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Time：2021-8-25
Series articles： Algorithm and data structure series (I) – level differentiated understanding of algorithms Algorithm and data structure series (II) – Basic preparation before implementation Algorithm and data structure series (III) – select sort Algorithm and data structure series (IV) – insertion sorting method – insert sort Algorithm and data structure series (V) – improvement […]
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Time：2021-8-22
Original link:http://tecdat.cn/?p=22721 Lease absolute shrinkage and selection operator (lasso) performs regularization and variable selection on a given model. Depending on the size of the penalty term, Lasso reduces the less relevant predictors to (possibly) zero. Therefore, it enables us to consider a more concise model. In this set of exercises, we will implement lasso regression […]
