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Message-ID: <4407842.1147353667352.JavaMail.jirabrutus>
Date: Thu, 11 May 2006 13:21:07 +0000 (GMT+00:00)
From: "Andrzej Bialecki (JIRA)" <jiraapache.org>
To: nutch-devincubator.apache.org
Subject: [jira] Commented: (NUTCH-267) Indexer doesn't
consider linkdb when
calculating boost value
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[ http://issues.apache.org/jira/browse
/NUTCH-267?page=comments#action_12379072 ]
Andrzej Bialecki commented on NUTCH-267:
-----------------------------------------
Hmm, resetting the score to 0 is also dubious - it's as if
we didn't want it to be re-crawled if we can't find any
inlinks to it... I believe it should be reset to the
following value:
newScore = initialScore - sum(distributedScoreM) +
sum(incomingScoreN)
where initialScore is the score we got from previous
iterations (or injectedScore), sum(distributedScoreM) is
what we have distributed to M outlinks from that page, and
sum(incomingScoreN) is what is contributed by N inlinks.
Current formula omits the sum(distributedScoreM); it also
doesn't provide any way to "sponsor" pages with
no incoming links so that they won't get broke (the concept
of "virtual nodes" I mentioned above).
Re: summing logs: yes, but then why use "sqrt(opic) *
docSimilarity" instead of "log(opic *
docSimilarity)"?
> Indexer doesn't consider linkdb when calculating boost
value
>
------------------------------------------------------------
>
> Key: NUTCH-267
> URL: http:/
/issues.apache.org/jira/browse/NUTCH-267
> Project: Nutch
> Type: Bug
> Components: indexer
> Versions: 0.8-dev
> Reporter: Chris Schneider
> Priority: Minor
>
> Before OPIC was implemented (Nutch 0.7, very early
Nutch 0.8-dev), if indexer.boost.by.link.count was true, the
indexer boost value was scaled based on the log of the # of
inbound links:
> if (boostByLinkCount)
> res *= (float)Math.log(Math.E + linkCount);
> This is no longer true (even before Andrzej implemented
scoring filters). Instead, the boost value is just the
square root (or some other scorePower) of the page score.
Shouldn't the invertlinks command, which creates the
linkdb, have some affect on the boost value calculated
during indexing (either via the OPICScoringFilter or some
other built-in filter)?
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