Solved

Text Classifier - Machine Learning

Posted on 2011-09-09
5
501 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 26

Accepted Solution

by:
dpearson earned 500 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 26

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

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Non-recursive backtracking, using a stack 1 134
Please explain: Aspect Oriented Programming 2 93
shd and spl analysis 3 111
Java Loop 6 61
Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
A short article about problems I had with the new location API and permissions in Marshmallow
In this fifth video of the Xpdf series, we discuss and demonstrate the PDFdetach utility, which is able to list and, more importantly, extract attachments that are embedded in PDF files. It does this via a command line interface, making it suitable …
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…

773 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