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Posted to java-user@lucene.apache.org by Eric Jain <Er...@isb-sib.ch> on 2006/03/07 15:08:29 UTC
Re: Get only count
Anton Potehin wrote:
> Now I create new search for get number of results. For example:
>
> IndexSearcher is = ...
>
> Query q = ...
>
> numberOfResults = Is.search(q).length();
>
> Can I accelerate this example ? And how ?
Perhaps something like:
class CountingHitCollector
implements HitCollector
{
public int count;
public void collect(int doc, float score)
{
if (score > 0.0f)
++count;
}
}
...
CountingHitCollector c = new CountingHitCollector();
searcher.search(query, c);
int hits = c.count;
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Re: Get only count
Posted by Paul Elschot <pa...@xs4all.nl>.
On Wednesday 08 March 2006 09:25, anton@orbita1.ru wrote:
> Signifies this that method collect can be called for document with score <=
> 0 ?
The collect() method is called after next() on the top level Scorer has
returned true. In between score() is called on that Scorer to provide the
score value, but the score value is not tested.
Most Scorers give only positive score values for matching documents.
This is implemented in the IndexSearcher.search(...) and
Scorer.score(HitCollector) methods.
Regards,
Paul Elschot
>
> -----Original Message-----
> From: Yonik Seeley [mailto:yseeley@gmail.com]
> Sent: Tuesday, March 07, 2006 6:35 PM
> To: java-user@lucene.apache.org
> Subject: Re: Get only count
> Importance: High
>
> On 3/7/06, anton@orbita1.ru <an...@orbita1.ru> wrote:
> > Can have matching document score equals zero ?
>
> Yes. Scorers don't generally use "score" to determine if a document
> matched the query.
> Scores <= 0.0f are currently screened out at the top level search
> functions, but not when you use a HitCollector yourself.
>
> -Yonik
>
>
> > -----Original Message-----
> > From: Yonik Seeley [mailto:yseeley@gmail.com]
> > Sent: Tuesday, March 07, 2006 6:20 PM
> > To: java-user@lucene.apache.org
> > Subject: Re: Get only count
> > Importance: High
> >
> > On 3/7/06, anton@orbita1.ru <an...@orbita1.ru> wrote:
> > > While you added "if (score > 0.0f)". Javadoc contain lines
> > > "HitCollector.collect(int,float) is called for every non-zero scoring".
> >
> > That should probably read "is called for every matching document".
> >
> > -Yonik
>
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>
>
>
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RE: Get only count
Posted by an...@orbita1.ru.
Signifies this that method collect can be called for document with score <=
0 ?
-----Original Message-----
From: Yonik Seeley [mailto:yseeley@gmail.com]
Sent: Tuesday, March 07, 2006 6:35 PM
To: java-user@lucene.apache.org
Subject: Re: Get only count
Importance: High
On 3/7/06, anton@orbita1.ru <an...@orbita1.ru> wrote:
> Can have matching document score equals zero ?
Yes. Scorers don't generally use "score" to determine if a document
matched the query.
Scores <= 0.0f are currently screened out at the top level search
functions, but not when you use a HitCollector yourself.
-Yonik
> -----Original Message-----
> From: Yonik Seeley [mailto:yseeley@gmail.com]
> Sent: Tuesday, March 07, 2006 6:20 PM
> To: java-user@lucene.apache.org
> Subject: Re: Get only count
> Importance: High
>
> On 3/7/06, anton@orbita1.ru <an...@orbita1.ru> wrote:
> > While you added "if (score > 0.0f)". Javadoc contain lines
> > "HitCollector.collect(int,float) is called for every non-zero scoring".
>
> That should probably read "is called for every matching document".
>
> -Yonik
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Re: Get only count
Posted by Yonik Seeley <ys...@gmail.com>.
On 3/7/06, anton@orbita1.ru <an...@orbita1.ru> wrote:
> Can have matching document score equals zero ?
Yes. Scorers don't generally use "score" to determine if a document
matched the query.
Scores <= 0.0f are currently screened out at the top level search
functions, but not when you use a HitCollector yourself.
-Yonik
> -----Original Message-----
> From: Yonik Seeley [mailto:yseeley@gmail.com]
> Sent: Tuesday, March 07, 2006 6:20 PM
> To: java-user@lucene.apache.org
> Subject: Re: Get only count
> Importance: High
>
> On 3/7/06, anton@orbita1.ru <an...@orbita1.ru> wrote:
> > While you added "if (score > 0.0f)". Javadoc contain lines
> > "HitCollector.collect(int,float) is called for every non-zero scoring".
>
> That should probably read "is called for every matching document".
>
> -Yonik
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RE: Get only count
Posted by an...@orbita1.ru.
Can have matching document score equals zero ?
-----Original Message-----
From: Yonik Seeley [mailto:yseeley@gmail.com]
Sent: Tuesday, March 07, 2006 6:20 PM
To: java-user@lucene.apache.org
Subject: Re: Get only count
Importance: High
On 3/7/06, anton@orbita1.ru <an...@orbita1.ru> wrote:
> While you added "if (score > 0.0f)". Javadoc contain lines
> "HitCollector.collect(int,float) is called for every non-zero scoring".
That should probably read "is called for every matching document".
-Yonik
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---------------------------------------------------------------------
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Re: Get only count
Posted by Yonik Seeley <ys...@gmail.com>.
On 3/7/06, anton@orbita1.ru <an...@orbita1.ru> wrote:
> While you added "if (score > 0.0f)". Javadoc contain lines
> "HitCollector.collect(int,float) is called for every non-zero scoring".
That should probably read "is called for every matching document".
-Yonik
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RE: Get only count
Posted by an...@orbita1.ru.
While you added "if (score > 0.0f)". Javadoc contain lines
"HitCollector.collect(int,float) is called for every non-zero scoring".
-----Original Message-----
From: Eric Jain [mailto:Eric.Jain@isb-sib.ch]
Sent: Tuesday, March 07, 2006 5:08 PM
To: java-user@lucene.apache.org
Subject: Re: Get only count
Importance: High
Anton Potehin wrote:
> Now I create new search for get number of results. For example:
>
> IndexSearcher is = ...
>
> Query q = ...
>
> numberOfResults = Is.search(q).length();
>
> Can I accelerate this example ? And how ?
Perhaps something like:
class CountingHitCollector
implements HitCollector
{
public int count;
public void collect(int doc, float score)
{
if (score > 0.0f)
++count;
}
}
...
CountingHitCollector c = new CountingHitCollector();
searcher.search(query, c);
int hits = c.count;
---------------------------------------------------------------------
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---------------------------------------------------------------------
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