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porter's stemmer implementation
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Date: 2010-01-17 (19:33)
From: Yoann Padioleau <padator@w...>
Subject: Re: [Caml-list] porter's stemmer implementation

On Jan 16, 2010, at 11:01 PM, Grégoire Seux wrote:

> Hello,
> I am looking for an implementation of Porter's stemmer in ocaml.

There is one in nltk, a very complete python library for NLP and there is
ocamlpython to link ocaml and python code. As the stemmer interface is
very simpler (string -> string), it's very easy to use ocamlpython to do that.

Basically you can do in a python file nltk_ocaml,py:

import nltk, re

stemmer = nltk.PorterStemmer()

def stem(s):
    return stemmer.stem(s)

def test_nltk_ocaml():
    print "test_nltk_ocaml"

and in a ml file nltk.ml:
open Pycaml

module Py = Python 
let modul = Py.cpr (Pycaml.pyimport_importmodule "nltk_ocaml")
let dict = Py.cpr (Pycaml.pymodule_getdict modul)

let stem s = 
  let py_str = Pycaml.pystring_fromstring s in
  let f = Py.cpr (Pycaml.pydict_getitemstring(dict, "stem")) in
  let args = Py.cpr (Pycaml.pytuple_fromsingle py_str) in
  let res = Py.cpr (Pycaml.pyeval_callobject (f,args)) in
  Pycaml.guarded_pystring_asstring res

> Erik Arneson published a few years ago a link to his implementation, but the file is no longer available, does someone has a copy of the file or another implementation ? 
> By the way, I am looking for every library that could be used in index construction in Ocaml, of course !
> Thanks by advance, 
> Gregoire Seux
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