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https://issues.apache.org/jira/browse/LUCENE-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145502#comment-13145502
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David Mark Nemeskey commented on LUCENE-3566:
---------------------------------------------
bq. i didnt think H1 took params (the thesis says 'Therefore, the constant of C
is 1 assuming H1', then defines it without C). did the IB paper make a mistake?
Good question. Perhaps it was a mistake; however, according to my colleague,
who had experimented with the IB method in our own engine and proposed to add
the parameter to Lucene, a well chosen {{c}} can improve the results. Well, duh
really; nevertheless, as long as we have defaults, shouldn't be a problem. :)
> Parametrizing H1 and H2
> -----------------------
>
> Key: LUCENE-3566
> URL: https://issues.apache.org/jira/browse/LUCENE-3566
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 4.0
> Reporter: David Mark Nemeskey
> Assignee: David Mark Nemeskey
> Priority: Minor
> Labels: score
> Fix For: 4.0
>
> Attachments: LUCENE-3566.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> The DFR normalizations {{H1}} and {{H2}} are parameter-free. This is in line
> with the [original
> article|http://citeseer.ist.psu.edu/viewdoc/summary?doi=10.1.1.101.742], but
> not with the [thesis|http://theses.gla.ac.uk/1570/], where H2 accepts a {{c}}
> parameter, nor with [information-based
> models|http://dl.acm.org/citation.cfm?id=1835490], where H1 also accepts a
> {{c}} parameter.
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