tablet metrics

the ratio of the number of samples to the total number of samples.A = (tp + tn)/(P+N) = (tp + TN)/(TP + FN + FP + TN); It reflects the ability of the classifier to judge the whole sample-positive judgment is positive and negative judgment is negative.2. Confusion matrices (confusion matrix)3. Accuracy rate (Precision), recall rate (Recall) and F1-measureAccuracy rate (Precision):PRE = tp/(TP+FP); Reflects the proportion of the true positive sample in the positive case determined by the classifi

Recently I joined a new Java project and found that the relationship between packages and classes is not very clear and confusing. The results of the CAP and JDepend checks are poor. It seems that not all people have this sense, about code quality, about design, about dependencies between classes, etc. Post two papers on this: OO Design Quality Metrics An Analysis of Dependencies Http://www.objectmentor.com/resources/articles/oodmetrc.pdf Software

Redis Performance Metrics monitoring commandsIn the process of learning, we must learn to use help frequently to understand the specific use of commands.1.info (monitoring typically uses this command to read data)127.0.0.1:6379> Help InfoINFO [Section]Summary:get information and statistics about the serversince:1.0.0Group:server127.0.0.1:6379> Info# Serverredis_version:3.0.7redis_git_sha1:00000000redis_git_dirty:0Redis_build_id:8d64350b19f2f7d2Redis_m

video quality metrics (VQM), and the latest proposed space PSNR (Spsnr) and Time PSNR (Tpsnr).The remainder of this article is organized as follows. In the second part, we describe the basis of the viewpoint synthesis technique. In the third and fourth part, we put forward the viewpoint synthesis algorithm and the evaluation criterion respectively. Part V, we show and evaluate the performance of the proposed algorithm. Part VI summarizes the article.

Reference: http://scikit-learn.org/stable/modules/metrics.htmlThe sklearn.metrics.pairwise Submodule implements utilities to evaluate pairwise distances (distance from sample pairs) or affinity o F Sets of samples (similarity of sample set). Distance Metrics is Functionsd (A, NBSP; b) such that d (A, b) d (A, c) if objectsa NBSP;ANDNBSP; b a NBSP;ANDNBSP; c .NBSP; Kernels is measures of similarity, I.e.s (A, NBSP; b) > s (A,

Often people ask your company website how many IP?? How much PV?? How much UV?? How much concurrency??I'm the only one with a face!!Let's take a look at the terminology mentioned above separately.IpIP, which refers to the number of independent IP, independent IP number refers to the total number of times when a computer accessing a website by a different IP addressThe number of independent IP is an important measure of website traffic, it is generally said that a day how many IPUsually the sam

Resource utilizationRefers to the use of different system resources, such as server CPU utilization, disk utilization, and so on. Resource utilization is the main basis for analyzing system performance Index and improving performance, so it is the focus of Web performance testing work.Resource utilization is mainly for Web server, operating system, database server, network and so on, which is the main reference for testing and analyzing bottleneck. In the Web performance test, it is more necessa

Level One (Entry level, programmer level): This is the most basic level, with a certain amount of time professional training staff can achieve. The metrics are: 1. Have the most basic logical thinking ability, can analyze simple problem solving steps. 2. Familiar with the requirements of the development of the language of the basic syntax, commonly used function library or class library. 3. Master the use of the compiler, understand the general projec

The generalization performance of the learner is evaluated. In the measure, we should have the evaluation criterion to measure the generalization ability of the model. Performance metrics reflect task requirements, and using different performance metrics often leads to different judgments when comparing the capabilities of different models, which means that the model is relatively good or bad, and that the

Tags: ber write amp order parameter IO performance HDD persistence anotherThis article focuses on common metrics for using Performance Monitor to monitor SQL Server under Windows, including the buffer Cache hit Ratio, pages/sec, Available Bytes, Disk Time, AVG. Disk Queue Length, Processor time, Processor queue Length, etc. 1.SQL Server buffer:buffer Cache hit Ratio This is a very important parameter to see if the memory is insufficient. The counters

Tags: MySQL performance metrics statistics--Generate report file to/tmp directoryTee/tmp/mysql_performance_stat.txt--Statistical performance indicators to open the following parameters, which uses the IS database to hold database information, due to the use of PS library storage there is still a bug, information statistics are not completeShow variables like ' show_compatibility_56 ';Set global show_compatibility_56=on;Show variables like ' show_compa

Label: MySQL metrics (because this is not the difference between most search engines intentionally) Index (total index): Main indicator, no matter what the limit ALTER TABLE ' table_name ' ADD INDEX index_name (' column ') Unique (unique index): Similar to "normal index". The difference is that the value of the indexed column must be unique. But agreed to have a null value. ALTER TABLE ' table_name ' ADD UNIQUE (' column ') Note: The purpose of creati

dbcommandinterceptioncontext , let's call the context of the Listener SQL command, and we'll see what this class contains. As follows: In this class there is an important attribute UserState , oh, meaning the user state, according to the summary information, we can set the information we operate, but also a type of object, it seems to be conducive to the conversion between the object. Next go to the topic, how do we judge SQL performance metrics