Older blog entries for sness (starting at number 4693)


Logistic: "
In order to find the matrix B for which L is minimised, a Quasi-Newton Method is used to search for the optimized values of the m*(k-1) variables. Note that before we use the optimization procedure, we 'squeeze' the matrix B into a m*(k-1) vector. For details of the optimization procedure, please check weka.core.Optimization class.

Although original Logistic Regression does not deal with instance weights, we modify the algorithm a little bit to handle the instance weights.

For more information see:

le Cessie, S., van Houwelingen, J.C. (1992). Ridge Estimators in Logistic Regression. Applied Statistics. 41(1):191-201."

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Syndicated 2012-12-01 00:59:00 from sness


Logistic: "Class for building and using a multinomial logistic regression model with a ridge estimator.

There are some modifications, however, compared to the paper of leCessie and van Houwelingen(1992):

If there are k classes for n instances with m attributes, the parameter matrix B to be calculated will be an m*(k-1) matrix.

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Syndicated 2012-12-01 00:02:00 from sness

WEKA - Convert from arff to csv from command line?

WEKA - Convert from arff to csv from command line?: " weka.core.converters.CSVSaver -i -o "

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java -Xmx1500m -classpath /usr/share/java/weka.jar weka.core.converters.CSVSaver -i test.arff -o test.csv

Syndicated 2012-11-30 18:48:00 from sness

Getting Started

Getting Started: "/* local mode */
$ pig -x local ...

/* mapreduce mode */
$ pig ...
$ pig -x mapreduce ..."

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Syndicated 2012-11-30 18:41:00 from sness

Performing Data Science with HBase: Strata Conference + Hadoop World - O'Reilly Conferences, October 23 - 25, 2012, New York, NY

Performing Data Science with HBase: Strata Conference + Hadoop World - O'Reilly Conferences, October 23 - 25, 2012, New York, NY: "Regardless, large amounts of data – especially data about users intended for use in an online system such as an e-commerce site, gaming platform, or ad network – is stored in HBase, and data scientists must be able to perform investigative analysis on this information to better understand their business and improve these online processes. And the read/write model of HBase offers advantages over HDFS to the data scientist building complex analysis pipelines."

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Syndicated 2012-11-29 23:30:00 from sness

Software Engineer, Data Infrastructure Engineering | Facebook Careers

Software Engineer, Data Infrastructure Engineering | Facebook Careers: "Facebook is seeking a Software Engineer to join the Data team. The ideal candidate will dream about distributed systems for the parallel processing of massive quantities of data, be familiar with Hadoop/Pig/HBase and MapReduce/Sawzall/Bigtable, and frequently think to themselves, 'Yeah, that works for 500 MB of data; what about 500 TB?' This position is full-time and based in our New York office."

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Syndicated 2012-11-29 23:27:00 from sness

NetInfo Manager - Wikipedia, the free encyclopedia

NetInfo Manager - Wikipedia, the free encyclopedia: "Methods for editing users attributes on Mac OS X Leopard (user shell, uid, primary gid, home directory path)

command line: dscl (Panther, Tiger, Leopard)
System Preferences:Accounts Pane – unlock the accounts pane – right-click/control-click on a user account – pop-up menu "advanced" – this panel will let you edit user attributes.
Note: you may need to reboot after changing this sort of information, or run 'dscacheutil -flushcache' from the command line."

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Syndicated 2012-11-29 21:48:00 from sness

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