Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Text Classifier - Machine Learning

Posted on 2011-09-09
5
Medium Priority
?
528 Views
Last Modified: 2012-05-12
Hey,

I have a few thousand quite text files that need to be classified by category.

I already have a few hundred manually classified.

There are about 50 different categories.

I'm thinking of using MALLET:
http://mallet.cs.umass.edu/index.php

But the problem is that I have no idea how to use MALLET, the instructions not being very good.

Could someone please explain how I would use MALLET for my purpose, or give me some other software to use which could do this?

Thank you for your time!

ADFB
0
Comment
Question by:ADFB
  • 2
  • 2
5 Comments
 
LVL 37

Expert Comment

by:bbao
ID: 36516769
0
 

Author Comment

by:ADFB
ID: 36517460
That's not how to use it, that's how to make it.

I only want to know how to use the application for my purposes, not hold to build it from scratch.
0
 
LVL 28

Accepted Solution

by:
dpearson earned 2000 total points
ID: 36518141
I think you want to work through the quick start:
http://mallet.cs.umass.edu/quick-start.php

and then more specifically the document classification sample:
http://mallet.cs.umass.edu/classification.php

Once you have a basic loop going where you can train a classifier successfully you should be able to apply it to your specific problem fairly easily.

You can also get help from them directly at:
mallet-dev@cs.umass.edu.

Doug
0
 

Author Comment

by:ADFB
ID: 36518608
OK, thanks. I think I've figured it out, but I'm still confused about the following:

----------
Applying a Saved Classifier to New Unlabeled Data: To apply a saved classifier to new unlabeled data, use Csv2Classify (for one-instance-per-line data) or Text2Classify (for one-instance-per-file data).

bin/mallet classify-file --input data --output - --classifier classifier
bin/mallet classify-dir --input datadir --output - --classifier classifier

Using the above commands, classifications are written to standard output.
----------

I want it to output to CSV format, but I don't know what to type to get it to do that. What should the command look like to get it to output to CSV?

Thanks!
0
 
LVL 28

Expert Comment

by:dpearson
ID: 36519377
I didn't see anything obvious about the output format.  If it's not listed in the "--help" you may need to write a small converter program (e.g. in Perl) to take the output and convert it to CSV format.

If that outside your comfort zone, you can probably email the developers and they could either point you to an existing tool or they could extend Mallet to support CSV output.

Doug
0

Featured Post

Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This is about my first experience with programming Arduino.
Make the most of your online learning experience.
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…
Loops Section Overview

916 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question