.. _fwflag_num_lda_threads:
===================
--num_lda_threads
===================
Switch
======

--num_lda_threads N

Description
===========

Number of threads Mallet uses when estimating LDA topics.

Argument and Default Value
==========================

An integer. Default: ``4``.

Details
=======

Verified end-to-end with real Mallet: passed straight through to ``LDAEstimator`` and on to Mallet's ``--num-threads`` option.

Other Switches
==============

Required Switches:

* :doc:`fwflag_estimate_lda_topics`

Example Commands
================

Using the packaged ``dla_tutorial`` dataset (see :doc:`../../tutorials/tut_lda`):

.. code-block:: bash

	dlatkInterface.py -d dla_tutorial -t msgs -c user_id -f 'feat$1gram$msgs$user_id' \
	--estimate_lda_topics --num_topics 100 --no_lda_lexicon \
	--mallet_path /opt/homebrew/bin/mallet --save_lda_files ./lda_out --num_lda_threads 4