Commit 7f3e958ff8a78b1f8251027260efc357b83740cc
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first commit. stand-alone functions build on top of mirimiri and lda-ruby to ext…
…ract contextual features from general corpora.
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README.markdown
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| 1 | +# context | |
| 2 | + | |
| 3 | +Copyright (C) 2012 Romain Deveaud <romain.deveaud@gmail.com> | |
| 4 | + | |
| 5 | +License | |
| 6 | +======= | |
| 7 | + | |
| 8 | +This program is free software: you can redistribute it and/or modify | |
| 9 | +it under the terms of the GNU General Public License as published by | |
| 10 | +the Free Software Foundation, either version 3 of the License, or | |
| 11 | +(at your option) any later version. | |
| 12 | + | |
| 13 | +This program is distributed in the hope that it will be useful, | |
| 14 | +but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 | +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 | +GNU General Public License for more details. | |
| 17 | + | |
| 18 | +You should have received a copy of the GNU General Public License | |
| 19 | +along with this program. If not, see <http://www.gnu.org/licenses/>. |
context.rb
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| 1 | +#!/usr/bin/env ruby | |
| 2 | + | |
| 3 | +require 'mirimiri' | |
| 4 | +require 'sanitize' | |
| 5 | +require 'lda-ruby' | |
| 6 | + | |
| 7 | +module Context | |
| 8 | + IndexPaths = { | |
| 9 | + :web_en => '/mnt/disk2/ClueWeb09_English_1_sDocs', | |
| 10 | + :web_fr => '/mnt/disk2/ClueWeb09_French_1_sDocs', | |
| 11 | + :web_nospam => '/mnt/disk1/ClueWeb09_English_1noSpam', | |
| 12 | + :gigaword => '/local/data/GigaWord/index', | |
| 13 | + :nyt => '/local/data/NYT_index', | |
| 14 | + :wiki_en => '/local/data/WikiEn_index', | |
| 15 | + :wiki_fr => '/local/data/WikiFr_index' | |
| 16 | + } | |
| 17 | + | |
| 18 | + def Context.term_context index_path,query,size,num_page,args={} | |
| 19 | + args[:func] ||= :entropy | |
| 20 | + args[:window] ||= 1 | |
| 21 | + | |
| 22 | + docs = self.feedback_docs index_path,query,num_page | |
| 23 | + | |
| 24 | + resource = Mirimiri::Document.new docs.join(' ') | |
| 25 | + terms = self.extract_ngrams resource,args[:func].to_sym,args[:window] | |
| 26 | + | |
| 27 | + context = "#weight ( #{terms.compact.sort{ |a,b| b[0] <=> a[0]}[0,size].collect { |e| "#{e[0]} #1(#{e[1]})" }.join " "} ) " unless terms.empty? | |
| 28 | + | |
| 29 | + context | |
| 30 | + end | |
| 31 | + | |
| 32 | + def Context.topic_context index_path,query,size,num_page,args={} | |
| 33 | + corpus = Lda::Corpus.new | |
| 34 | + | |
| 35 | + docs = self.feedback_docs index_path,query,num_page | |
| 36 | + docs.each do |d| | |
| 37 | + doc = Lda::TextDocument.new corpus,d | |
| 38 | + corpus.add_document doc | |
| 39 | + end | |
| 40 | + | |
| 41 | + lda = Lda::Lda.new corpus | |
| 42 | + lda.num_topics = num_page/10 | |
| 43 | + lda.em 'random' | |
| 44 | + puts lda.top_words(size) | |
| 45 | + end | |
| 46 | + | |
| 47 | + private | |
| 48 | + def Context.feedback_docs index_path,query,num_page | |
| 49 | + query = Indri::IndriQuery.new({:query => query, :count => num_page},"-printDocuments=true -trecFormat=true") | |
| 50 | + index = Indri::IndriIndex.new index_path | |
| 51 | + idocs = Indri::IndriPrintedDocuments.new(index.runquery(query).force_encoding("ISO-8859-1").encode("UTF-8")) | |
| 52 | + | |
| 53 | + docs = idocs.extract_docs.collect { |idoc| Sanitize.clean idoc,:remove_contents => ['script'] } | |
| 54 | + docs | |
| 55 | + end | |
| 56 | + | |
| 57 | + def Context.extract_ngrams resource,func,n | |
| 58 | + raw_terms = 1.upto(n).collect { |i| resource.ngrams(i) }.flatten | |
| 59 | + terms = raw_terms.uniq.collect { |w| [resource.send(func.to_sym,w), w.unaccent] unless w.is_stopword? || w.split.all? { |e| e.length <= 1 } || w.split.all? { |e| e !~ /[a-zA-Z]/ } || w.include?(".") } | |
| 60 | + terms | |
| 61 | + end | |
| 62 | + | |
| 63 | +end |