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https://issues.apache.org/jira/browse/MAHOUT-242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804158#action_12804158
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Drew Farris commented on MAHOUT-242:
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Ted,
Thanks for the advice, I'll take a look at doing something in line with the
structure you describe. It may be useful to re-used the classes introduced with
Lucene's new [TokenStream
API|http://lucene.apache.org/java/2_9_1/api/core/org/apache/lucene/analysis/TokenStream.html],
where essentially each Token is really a collection of different types of
[attributes|http://lucene.apache.org/java/2_9_1/api/core/org/apache/lucene/util/Attribute.html].
Each of the existing attributes are serializable which suggests that there
might be a short path to Writable for these, I'll see if Avro offers any
shortcuts here. A subclass of IndexWriter may indeed be a very quick route to
this.
I also wonder if flipping this around and implementing a LuceneIndexInputFormat
may be another option.
> LLR Collocation Identifier
> --------------------------
>
> Key: MAHOUT-242
> URL: https://issues.apache.org/jira/browse/MAHOUT-242
> Project: Mahout
> Issue Type: New Feature
> Affects Versions: 0.3
> Reporter: Drew Farris
> Priority: Minor
> Attachments: MAHOUT-242.patch, MAHOUT-242.patch,
> mahout-colloc.tar.gz, mahout-colloc.tar.gz
>
>
> Identifies interesting Collocations in text using ngrams scored via the
> LogLikelihoodRatio calculation.
> As discussed in:
> *
> http://www.lucidimagination.com/search/document/d051123800ab6ce7/collocations_in_mahout#26634d6364c2c0d2
> *
> http://www.lucidimagination.com/search/document/b8d5bb0745eef6e8/n_grams_for_terms#f16fa54417697d8e
> Current form is a tar of a maven project that depends on mahout. Build as
> usual with 'mvn clean install', can be executed using:
> {noformat}
> mvn -e exec:java -Dexec.mainClass="org.apache.mahout.colloc.CollocDriver"
> -Dexec.args="--input src/test/resources/article --colloc target/colloc
> --output target/output -w"
> {noformat}
> Output will be placed in target/output and can be viewed nicely using:
> {noformat}
> sort -rn -k1 target/output/part-00000
> {noformat}
> Includes rudimentary unit tests. Please review and comment. Needs more work
> to get this into patch state and integrate with Robin's document vectorizer
> work in MAHOUT-237
> Some basic TODO/FIXME's include:
> * use mahout math's ObjectInt map implementation when available
> * make the analyzer configurable
> * better input validation + negative unit tests.
> * more flexible ways to generate units of analysis (n-1)grams.
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