Description:

This source directory contains library routines that provide alternative ways of computing generalised second order Stirling numbers used in working with Pitman-Yor and Dirichlet processes (PYP and DP). Included is library routines for posterior sampling on the discount and concentration parameters of the PYP/DP, and some simple demo scripts.

System used for Pitman-Yor processing with topic models, to allow easy scaling to gigabytes of text. Tested on a few versions on Ubuntu Linux and MacOSX. Requires the GSL (GNU Scientific Library) for polygamma functions.

Matching paper with some of the theory at http://arxiv.org/abs/1007.0296

Changes to previous version:

Bug fix for samplea() using getval(). Change to samplea() interface allowing mixed dimensions.

BibTeX Entry: Download

Supported Operating Systems: Linux, Mac Os X

Data Formats: Agnostic

Tags: Library, Pitman Yor Process, Stirling Number

Archive: download here

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