You can boost any clause of a query:
http://lucene.apache.org/java/docs/queryparsersyntax.html
title:foo^5 header:foo^2 body:foo
On 31-Jul-07, at 1:00 PM, Askar Zaidi wrote:
I'll have to use StringBuffer and get the Explanation in it as a
String.
Then parse StringBuffer to get the scores of each field, then add
them and
then boost the scores. That seems to be a non-trivial task. Is
there any
other way around it ?
Considering Boosting, can I boost the score of a field ? I came across
Boosting of a term in the query so that would mean,
"apache^4 jakarta"
This means I am more keen to find apache than jakarta. I am keen to
boost
the score of a field, how can that be done ?
On 7/31/07, Askar Zaidi <[EMAIL PROTECTED]> wrote:
Using the Explanation method can help me get the exact score of a
field. I
am concerned with how I can access it , this is what I am doing:
for(int i=0;i<hitCount;i++){
doc = hits.doc(i);
score = hits.score(i);
int ID = hits.id(i);
System.out.println( id + "\t" + score + "\t" +
doc.get
("item"));
Explanation exp = searcher.explain( query , ID );
System.out.println( exp.toString() );
}
This shows me o/p as follows (trimmed output):
6.6197186E-4 = (MATCH) product of:
0.0033098592 = (MATCH) sum of:
0.0033098592 = (MATCH) weight(contents:innovation in 4),
product of:
0.28244132 = queryWeight(contents:innovation), product of:
1.0 = idf(docFreq=5)
0.28244132 = queryNorm
0.01171875 = (MATCH) fieldWeight(contents:innovation in 4),
product
of:
1.0 = tf(termFreq(contents:innovation)=1)
1.0 = idf(docFreq=5)
0.01171875 = fieldNorm(field=contents, doc=4)
0.2 = coord(1/5)
The 6.6197E-4 is the total score of the document. How can I access
the
fieldWeight ? Any example would be great.
thanks,
AZ
On 7/31/07, Erick Erickson <[EMAIL PROTECTED]> wrote:
Boost the other three fields at search time. Boosting during
index time expresses "this document's title is worth more than
other doucments' titles". Boosting during search time expresses
"I care about matches on this clause more than I do on other
clauses".
Will it help? How should I know? It's *your* application and
*you* are the one who is dissatisfied with the current scoring <G>.
All I can say is try it and find out. You might consider using Luke
to try various boosts without having to mess with too much code.
Erick
On 7/31/07, Askar Zaidi <[EMAIL PROTECTED]> wrote:
Boosting during Indexing or boosting during search ?
I have 4 fields:
{tags},{title},{summary},{contents}
Typically a phrase occurs too many times in contents as compared to
the
other fields. If I get the score of contents field , I can pass it
through
an adjuster function which will bring the score down. Something
like:
public static double adjuster(double count){
double newCount;
newCount = 1/Math.exp(count);
System.out.println(newCount);
return newCount;
}
Do you mean I could boost the values of the other 3 fields ?
Will that
help
? Would there be a way to bring down the score of the contents
field ?
thanks,
AZ
On 7/31/07, Erick Erickson <[EMAIL PROTECTED] > wrote:
Wouldn't boosting handle this for you?
On 7/31/07, Askar Zaidi <[EMAIL PROTECTED]> wrote:
To be more specific:
I want to retrieve the scores of individual fields inside a
document
so
that
I can manipulate the score of one field. This is the requirement
of my
application. After the manipulation I can add these scores and
then
show
the
total.
thanks,
AZ
On 7/31/07, Askar Zaidi <[EMAIL PROTECTED]> wrote:
Hey guys,
I was wondering if there is a way to retrieve score of a field
in a
document ?
If my document looks like this:
{itemID},{field 1},{field 2}
I'd like to get score of individual fields 1 and 2 rather than
the
score
of the entire document.
Is it possible ?
thanks,
AZ
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