Mallet topic modelling

Question

I have been using mallet for inferring topics for a text file containing 100,000 lines(around 34 MB in mallet format). But now i need to run it for on a file containing a million lines(around 180MB) and I am getting an java.lang.outofmemory exception . Is there a way of splitting the file into smaller ones and build a model for the data present in all the files combined?? thanks in advance

Answer 1

I'm not sure about scalability of Mallet to big data, but project http://dragon.ischool.drexel.edu/ can store its data in disk backed persistence therefore can scale to unlimited corpus sizes(with low performance of course)

Answer 2

The model is still going to be pretty much huge, even if it read it from multiple files. Have you tried increasing the heap size of your java vm?

Answer 3

Given the current PC's memory size, it should be easy to use a heap as large as 2GB. You should try the single-machine solution before considering using a cluster.

Answer 4

java.lang.outofmemory exception occurs mainly because of insufficient heap space. You can use -Xms and -Xmx to set heap space so that it will not come again.

Answer 5

In bin/mallet.bat increase value for this line:

set MALLET_MEMORY=1G