Boost maximum match in a field

[Nicholas Ding <ni...@gmail.com>]

Hello,

I was wondering how to boost a maximum match in a field. For example, you
have few documents has different length of title.

Doc 1:
Title: Ford Car Body Parts

Doc 2:
Title: 2012 Ford Car

Doc 3:
Title: Ford Car

If user searching for "Ford Car", how to make the Doc 3 has the highest
score?

Thanks
Nicholas

Re: Boost maximum match in a field

[Jack Krupansky <ja...@basetechnology.com>]

The length normalization "factor" is a very coarse value, so it may not be 
fine-grained enough to distinguish these particular field lengths. Normally, 
it is a short vs. long distinction rather than actual length.

In any case, add &debugQuery=true to your query and look at the "explain" 
section see how "norm" is either different or the same for these three 
documents in the results. The norm may in fact be fine, but maybe some other 
factors overwhelm the overall score.

-- Jack Krupansky

-----Original Message----- 
From: Timothy Potter
Sent: Monday, March 11, 2013 10:43 AM
To: solr-user@lucene.apache.org
Subject: Re: Boost maximum match in a field

I'm curious if the default ranking doesn't already return these in 3,2,1
order. Doc 3 should get an implicit boost with norms enabled for your title
field, so make sure the title field has omitNorms="false", ie. in
schema.xml:

<field name="title" ... omitNorms="false"/>

Tim

On Mon, Mar 11, 2013 at 8:02 AM, Nicholas Ding <ni...@gmail.com>wrote:

> Hello,
>
> I was wondering how to boost a maximum match in a field. For example, you
> have few documents has different length of title.
>
> Doc 1:
> Title: Ford Car Body Parts
>
> Doc 2:
> Title: 2012 Ford Car
>
> Doc 3:
> Title: Ford Car
>
> If user searching for "Ford Car", how to make the Doc 3 has the highest
> score?
>
> Thanks
> Nicholas
> 

Re: Boost maximum match in a field

[Timothy Potter <th...@gmail.com>]

I'm curious if the default ranking doesn't already return these in 3,2,1
order. Doc 3 should get an implicit boost with norms enabled for your title
field, so make sure the title field has omitNorms="false", ie. in
schema.xml:

<field name="title" ... omitNorms="false"/>

Tim

On Mon, Mar 11, 2013 at 8:02 AM, Nicholas Ding <ni...@gmail.com>wrote:

> Hello,
>
> I was wondering how to boost a maximum match in a field. For example, you
> have few documents has different length of title.
>
> Doc 1:
> Title: Ford Car Body Parts
>
> Doc 2:
> Title: 2012 Ford Car
>
> Doc 3:
> Title: Ford Car
>
> If user searching for "Ford Car", how to make the Doc 3 has the highest
> score?
>
> Thanks
> Nicholas
>