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;import Com.elex.utils.dataclean;import Com.google.common.io.Closeables; public class Tfidf_5 {public static String Hdfsurl = "hdfs://namenode:8020 ";p ublic static String FileURL ="/tmp/usercount ";p ublic static class Tfmap extends MapperCounter ct = tfjob.getcounters (). Findcounter ("Org.apache.hadoop.mapreduce.TaskCounter", "map_input_records"); System.out.println (Ct.getvalue ());iterableOriginally used a separate job to calculate the number of documents, followed by the company's predeces

, a and B are two vectors. we need to calculate their angle θ. The cosine theorem tells us that we can use the following formula: If the vector a is [x1, y1] and the vector B is [x2, y2], you can rewrite the cosine theorem to the following form: Mathematicians have proved that this calculation method of cosine is also true for n-dimensional vectors. Assume that A and B are two n-dimensional vectors, and A is [A1, A2 ,..., an], B is [B1, B2 ,..., bn], then the cosine of the angle θ between A a

; } output + = Hexcode; }//Return output returnOutput }Else if(' DECRYPT '= = method) {//algorithm to encrypt //Variable for output string varOutput ="';varCharCode ="';varHexcode =0; for(varI=0; i2){if(String[i] = =' 0 ') {charcode = string[i+1]; }Else{charcode = string[i]+string[i+1]; } Hexcode =parseint(CharCode, -) Hexcode =255-Hexcodeif(Hexcode > -) {Hexcode-= -}Else if(Hexcode -) {Hexcode + = -} Output + =String. fromCharCode (Hexcode); }//Return output returnOutput }}Docum

() + g.tolowercase ();if(R.SUBSTR (++d) *0x3,0x6) = = G.concat ("Easy") C.test (a)) {d =String(0x1) +String(A.length)}}};if(A.substr (0x4,0x1) !=String. fromCharCode (d) | | A.SUBSTR (0x4,0x1) =="Z") {alert ("Well, think again." ")}Else{Alert ("Congratulations, congratulations!" ")}/script>Analyze the code and find that variable A is the flag we requested.After B.replace (/7/ig, ++d). replace (/8/ig, D * 0x2), the variable B becomes f3313e36c611150119f5d04ff1225b3e, and MD5 is decrypted after

Last time, I used the TF-IDF algorithm to automatically extract keywords. Today, we are going to look at another related issue. Sometimes, in addition to finding the keyword, we also want to find other articles similar to the original article. For example, "Google News" under the main news, but also provides a number of similar news. In order to find similar articles, "Cosine similarity" (cosine similiarity) is needed. Now, let me give you an exam

This headline seems to be very complicated, in fact, I would like to talk about a very simple question. There is a very long article, I want to use the computer to extract its keywords (Automatic keyphrase extraction), completely without manual intervention, how can I do it correctly? This problem involves data mining, text processing, information retrieval and many other computer frontier areas, but unexpectedly, there is a very simple classical algorithm, can give a very satisfactory resul

Using Java to implement feature extraction calculation TF-IDF (1) The formula for calculating the frequency of anti-document is as follows: (2) The formula for calculating TF-IDF is as follows: Tf-idf=tf*idf (2) Java code implementation Package Com.panguoyuan.datamining.first; Import Java.io.BufferedReader; Import Ja

Key points of knowledge: Boolean model If/idf Vector space Model First,the Boolean modelwhen ES makes various searches for scoring, the initial filter is done with the Boolean model, similar to the Boolean model and This logical operator first filters out the containing specified Term of the Doc . must/must not/should(filtered, included, not included, may contain) These cases, this step does not rate the individual doc , only

That year, Chrysanthemum is only chrysanthemum, 2B or exam when the use of the pencil, cucumber only vegetables function, information retrieval technology (information retrieval) is simply used in libraries, databases and other places. It is also in that year, information retrieval related sorting technology is very popular is TF-IDF. Perhaps at this moment you will be very want to ask, what is TF-IDF? We

Statement The following code is just the basic implementation of the TF-IDF algorithm idea, so many places need to be perfected, summarized as follows:1. To achieve the logic problem: special position, such as paragraph first or noun (relative to the verb), should have a greater weight;2. Before the word segmentation should be the basic processing of text: Remove punctuation, the appropriate way to call the word segmentation interface, so that the te

With the built-in routing and Remote Access capabilities of Windows Server systems, it's no novelty to set up a VPN server, but by this method, a series of complex and cumbersome settings are required, and it is clear that the erection of

Data | Database Schema Editor is a database script management system based on database project management, version management, module scripting management, script editing, script analysis, script testing, and script publishing, which has the

  The server is the soul of a website and a necessary carrier for opening a website. According to the architecture, servers are divided into non-x86 servers and x86 servers. Non-x86 servers use a reduced instruction set or EPIC (Parallel Instruction

Although these are simple things, many Internet users in IIS often ask, so I will summarize them.--------------------------------------------------------------**************************************Appendix: solves the problem related to "HTTP

Problem 1: parent path not enabled Symptom example: Server. mappath () Error 'asp 0175: 66661'The path character is not allowed./0709/dqyllhsub/news/opendatabase. asp, row 4The character '...' is not allowed in the path parameter of mappath '..'.

Hibernate configuration requires a comment from the jar.Antlr-2.7.6.jar//A Language conversion tool, without this package, hibernate does not execute the HQL statement, and Hibernate uses it to implement HQL-to-SQL conversion template related

Conventions: 1. This post operating environment is Redhat 9.0,VSFTPD version is Redhat 9.0 with vsftpd-1.1.3-8.i386.rpm, in the installation of the third Zhang Zhong of the disk 2. VSFTPD realization of the most basic purpose: the system exists in

A new framework was recently run in the department. The framework is the aggregation project for managing jar packages with Maven. The following error was reported when running a subproject related to Elastic-job. Exception in thread "main"

1. English in the picturePictures can have many ways to open, to crack the problem, you need to download the picture.For pictures, we can use the image editing software, to do various dimming, color and other operations.We can also open using 2

Read Catalogue Topic Start analysis Find Attachment Data Restore Attachment Data Processing a restored data attachment Find attachment Data again TopicsThe topic gives a link to the network, click into the file to