1. What is a special course (specializations)?If you want to learn a major that you do not understand, you can study according to the special course arrangement. Coursera Special Course collects a field of curriculum, and according to the Order of teaching, it is very suitable for the new people who don't feel well.2. Program Design and algorithmThis special course is a computer Foundation course published by Peking University in
(Datasets) data (IRIS)#Exploratory Analysisnames (Iris) head (IRIS)#The following attempts to take Virginica,speal. The method of length is all wrongiris[,2]iris[iris$species=="virginica", 2]mean (iris[iris$species=="virginica", 2])##the above is Error,not correct##tapply (Test$sepal.length,test$species,mean)#using Species.mean to group vectors, this method is feasible, but the above method is necessary to look at the errorLibrary (Datasets) data (Mtcars) #以下为做某个题时的若干测试. And a trial-and-error l
networks and overfitting:
The following is a "small" Neural Network (which has few parameters and is easy to be unfitted ):
It has a low computing cost.
The following is a "big" Neural Network (which has many parameters and is easy to overfit ):
It has a high computing cost. For the problem of Neural Network overfitting, it can be solved through the regularization (λ) method.
References:
Machine Learning video can be viewed or downloaded on Coursera
NTU-Coursera ml: HomeWork 1 Q15-20Question15
The training data format is as follows:
The input has four dimensions, and the output is {-1, + 1 }. There are a total of 400 data records.
The question requires that the weight vector element be initialized to 0, and then "Naive Cycle" is used to traverse the training set. When the iteration is stopped, the weight vector is updated several times.
The so-called "Naive Cycle" means that after an error i
This series is a personal learning note for Andrew Ng Machine Learning course for Coursera website (for reference only)Course URL: https://www.coursera.org/learn/machine-learning Exercise 7--k-means and PCA
Download coursera-Wunda-Machine learning-all programming practice answers
In this exercise, you will implement the K-means clustering algorithm and apply it to compressed images. In the second section, y
; "title=" Image007.png "width=" "height=" "272" border= "0" hspace= "0" vspace= "0" alt= " Wkiol1igs-qwixeaaaathpvsd-0346.png "/>Save the configuration file and restart the system for the computer name to take effectModify the system timeRm-rf/etc/localtimeYum Install-y ntpdateNtpdate us.pool.ntp.orgLn-s/usr/share/zoneinfo/asia/shanghai/etc/localtimeInstalling the DatabaseYum install MySQL mysql-server mysql-devel-yConfiguration databaseService mysqld Startmysqladmin-u root password ' new passw
The wiki site emphasizes teamwork, which provides us with a good collaborative environment. There is no concept of copyright, information and knowledge is no longer a one-way from the authoritative top-down distribution, but completely multi-directional exchanges, the role of the center and around the reversal at any time, knowledge is the result of interaction, negotiation, sound noise, wiki site's reading
FitNesse provides an easy-to-use wiki to create a Web page for testing. The test page has a button that allows all tests to run on this page, so anyone can go to this page at any time to click on this button to see if the test passed. FitNesse provides a way to run tests automatically, so it can simply add a use case to an automated scripting build.What should the test page look like? A test page should be a wiki
The wiki's API format://language abbreviation. wikipedia.org/w/api.php?action=querytitles= language corresponding to the text format= return format prop= Revisionsrvprop=contentI'm now doing a Chinese history today get XML data (prop for version specific parameters click on the Chinese API and document view)The requested URL is: Http://zh.wikipedia.org/w/api.php?action=querytitles=12 month 31st format=xmlprop=revisions rvprop=content$str = file_get_contents ($need _url);//$content = $result->que
April 3
In the2006 recruitment (Market) Prediction"Also mentioned the use of Wiki-" 7) Recruitment of Wiki will be used by a few people, and most people will still have no idea about wiki ." I did not expect that donggua from the HR salon introduced me to a new website (log.goiee.com) last week ). This is a work similar to the famous American website del. icio.
In China, Coursera is very choppy and often gets stuck when playing half of the video. I don't know why. Therefore, you can only download the file and view it again.
There is a script on GitHub to open the link to download the entire course. It is very convenient to use. The method is as follows.
Because this script uses multiple Python libraries, it is best to use the Linux system. I use Debian Wheezy and python2.7.3. Of course, you need a
Label: Ar c working time r as Rom net 5CATEGORY first, 1. skill category; 2. improvement category; 3. Interest category.I have completed the first six courses of Andrew Ng ml, UW computer network, and dataset cience on Coursera.In the future, the service will be guaranteed to be 25 hours a week, with an average of 2.5-3 hours per working day and 11 hours on weekends. In this way, three courses can be conducted at the same time in less than ten weeks, it also needs to be arranged according to the
Coursera-getting and Cleaning Data-week4Thursday, January,Make up the fourth week notes, and this course summary.The four-week course focuses on text processing. Inside includes1. Handling of variable names 2. Regular Expression 3. Date processing (see Swirl lubridate package exercise)First, the processing of variable names, followed by two principles, 1) uniform case tolower/toupper;2) Remove the import data, because special characters caused by the
Build the company's wiki Server under Centos6
CentOS 6.4 system and Root or sudo permissions, the system is connected to the network normally
Software used:
Apache, mysql-server, php, mediawiki, memcached
Installation of software packages
First, install related software packages such as apache, php, mysql-server, and mysql-client.
# Yum install httpd php-mysql php-gd php-xml mysql-server mysql libxml2memcached lrzsz
Set the root password of the MYSQL
The goal is to resolve the specific syntax in the Forum to the actual URL of the Wiki, suchHttp://wiki.cwowaddon.com/Keywords
The following two types of Forum syntaxes must be supported:
Enable the Forum to support syntax such as [wiki] keyword [/wiki.
Make the Forum support the Wiki-specific reference syn
regression.
The root number can also be selected based on the actual situation.Regular Equation
In addition to Iteration Methods, linear algebra can be used to directly calculate $ \ matrix {\ Theta} $.
For example, four groups of property price forecasts:
Least Squares
$ \ Theta = (\ matrix {x} ^ t \ matrix {x}) ^ {-1} \ matrix {x} ^ t \ matrix {y} $Gradient Descent, advantages and disadvantages of regular equations Gradient Descent:
Desired stride $ \ Alpha $;
Multiple iterations are requ
Original title:Given Arrays a[] and b[], each containing n distinct 2D points in the plane, design a subquadratic algorithm to count The number of points that is contained both in array a[] and array b[].The goal of the topic is to calculate the number of duplicate point, very simple, the code is as follows1 ImportJava.awt.Point;2 Importjava.util.Arrays;3 ImportJava.util.HashSet;4 ImportJava.util.Set;5 6 ImportEdu.princeton.cs.algs4.StdRandom;7 8 Public classplanepoints {9 PrivatesetNewHash
]; - } - System.out.println (arrays.tostring (aux)); the intL = 0; - intR =N; - for(intk = 0; k){ - if(l >= N) Break;//The array of auxiliary elements is exhausted, and the right side of the array does not need to be shifted. + Else if(R>=2*n) array[k]=aux[l++];//all elements of the right element of array are placed in the appropriate position, then simply move the elements of the auxiliary array to the right of the array - Els
Before the machine learning is very interested in the holiday cannot to see Coursera machine learning all the courses, collated notes in order to experience repeatedly.I. Introduction (Week 1)-What's machine learningThere is no unanimous answer to the definition of machine learning.Arthur Samuel (1959) gives a definition of machine learning:Machine learning is about giving computers the ability to learn without explicit programming.Samuel designed a c
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