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From Tony Mullins <tonymullins...@gmail.com>
Subject Re: Calculating Solr document score by ignoring the <boost> field.
Date Wed, 10 Jul 2013 07:20:25 GMT
Ok thanks, I just wanted the know is it possible to ignore boost value or
not during score calculation and as you said its not.
Now I would have to focus on nutch to fix the issue and not to send boost=0
to Solr.

Regards,
Khan


On Wed, Jul 10, 2013 at 12:14 PM, Daniel Collins <danwcollins@gmail.com>wrote:

> Sorry to repeat Jacks' previous answer but x times zero is always zero :)
>
> A index boost is just what the name suggests, a factor by which the
> document score is boosted (multiplied). Since it is in an index time value,
> it is stored alongside the document, so any future scoring of the document
> by any query will take this value into account. If you take Solr's internal
> document score and then multiply it by zero, the result is by definition
> zero...
>
> What you seem to be saying is you are passing in an index time boost (which
> is incorrect but that's an issue with Nutch), but you want Solr to ignore
> it, surely the correct approach then is *not* to pass it in?
>
> Once the data is indexed, it is "fixed", unless you re-index the document,
> so if that data is wrong, there is nothing Solr can do about it, you have
> to re-index the documents that have incorrect data. If you want to just use
> TF-IDF for scoring and not use boosting, don't supply any boosting, it's
> that simple.  Sorry if this sounds repetitive, but can't think of any other
> way to say it.
>
>
> On 10 July 2013 06:33, Tony Mullins <tonymullins.tm@gmail.com> wrote:
>
> > Jack due to 'some' reason my nutch is returning me index time boost =0.0
> > and just for a moment suppose that nutch is and will always return boost
> > =0.
> >
> > Now my simple question was why Solr is showing me document's score = 0 ?
> > Why is it depending upon index time boost value ? Why or how to make Solr
> > to only calculate the score value on TF-IDF ?
> >
> > Regards,
> > Khan
> >
> >
> > On Tue, Jul 9, 2013 at 6:31 PM, Jack Krupansky <jack@basetechnology.com
> > >wrote:
> >
> > > Simple math: x times zero equals zero.
> > >
> > > That's why the default document boost is 1.0 - score times 1.0 equals
> > > score.
> > >
> > > Any particular reason you wanted to zero out the document score from
> the
> > > document level?
> > >
> > > -- Jack Krupansky
> > >
> > > -----Original Message----- From: Tony Mullins
> > > Sent: Tuesday, July 09, 2013 9:23 AM
> > > To: solr-user@lucene.apache.org
> > > Subject: Re: Calculating Solr document score by ignoring the  field.
> > >
> > >
> > > I am passing boost value (via nutch) and i.e boost =0.0.
> > > But my question is why Solr is showing me score = 0.0 when my boost
> > (index
> > > time boost) = 0.0 ?
> > > Should not Solr calculate its documents score on the basis of TF-IDF ?
> > And
> > > if not how can I make Solr to only consider TF-IDF while calculating
> > > document's score ?
> > >
> > > Regards,
> > > Khan
> > >
> > >
> > > On Tue, Jul 9, 2013 at 4:46 PM, Erick Erickson <
> erickerickson@gmail.com
> > >**
> > > wrote:
> > >
> > >  My guess is that you're not really passing on the boost field's value
> > >> and getting the default. Don't quite know how I'd track that down
> > >> though....
> > >>
> > >> Best
> > >> Erick
> > >>
> > >> On Tue, Jul 9, 2013 at 4:09 AM, imran khan <imrankhan.xyz1@gmail.com>
> > >> wrote:
> > >> > Greetings,
> > >> >
> > >> > I am using nutch 2.x as my datasource for Solr 4.3.0. And nutch
> passes
> > >> > on
> > >> > its own <boost> field to my Solr schema
> > >> >
> > >> > <field name="boost" type="float" stored="true" indexed="false"/>
> > >> >
> > >> > Now due to some reason I always get <boost> = 0.0 and due to
this my
> > >> Solr's
> > >> > document score is also always 0.0.
> > >> >
> > >> > Is there any way in Solr that it ignores the <boost> field's
value
> for
> > >> its
> > >> > document's score calculation ?
> > >> >
> > >> > Regards,
> > >> > Khan
> > >>
> > >>
> > >
> >
>

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