The mm parameter is really only relevant when the default operator is OR or
explicit OR operators are used.
Again: Please provide your use case examples and your expectations for each
use case. It really doesn't make a lot of sense to prematurely focus on a
solution when you haven't clearly defined your use cases.
-- Jack Krupansky
-----Original Message-----
From: S.L
Sent: Sunday, March 30, 2014 9:13 PM
To: solr-user@lucene.apache.org
Subject: Re: eDismax parser and the mm parameter
Jack,
I mis-stated the problem , I am not using the OR operator as default
now(now that I think about it it does not make sense to use the default
operator OR along with the mm parameter) , the reason I want to use pf and
mm in conjunction is because of my understanding of the edismax parser and
I have not looked into pf2 and pf3 parameters yet.
I will state my understanding here below.
Pf - Is used to boost the result score if the complete phrase matches.
mm <(less than) search term length would help limit the query results to a
certain number of better matches.
With that being said would it make sense to have dynamic mm (set to the
length of search term - 1)?
I also have a question around using a fuzzy search along with eDismax
parser , but I will ask that in a seperate post once I go thru that aspect
of eDismax parser.
Thanks again !
On Sun, Mar 30, 2014 at 6:44 PM, Jack Krupansky
<j...@basetechnology.com>wrote:
If you use pf, pf2, and pf3 and boost appropriately, the effects of mm
will be dwarfed.
The general goal is to assure that the top documents really are the best,
not to necessarily limit the total document count. Focusing on the latter
could be a real waste of time.
It's still not clear why or how you need or want to use OR as the default
operator - you still haven't given us a use case for that.
To repeat: Give us a full set of use cases before taking this XY Problem
approach of pursuing a solution before the problem is understood.
-- Jack Krupansky
-----Original Message----- From: S.L
Sent: Sunday, March 30, 2014 6:14 PM
To: solr-user@lucene.apache.org
Subject: Re: eDismax parser and the mm parameter
Jacks Thanks Again,
I am searching Chinese medicine documents , as the example I gave
earlier
a user can search for "Ginseng" or Siberian Ginseng or Red Siberian
Ginseng
, I certainly want to use pf parameter (which is not driven by mm
parameter) , however for giving higher score to documents that have more
of
the terms I want to use edismax now if I give a mm of 3 and the search
term
is of only length 1 (like "Ginseng") what does edisMax do ?
On Sun, Mar 30, 2014 at 1:21 PM, Jack Krupansky <j...@basetechnology.com>
wrote:
It still depends on your objective - which you haven't told us yet. Show
us some use cases and detail what your expectations are for each use
case.
The edismax phrase boosting is probably a lot more useful than messing
around with mm. Take a look at pf, pf2, and pf3.
See:
http://wiki.apache.org/solr/ExtendedDisMax
https://cwiki.apache.org/confluence/display/solr/The+
Extended+DisMax+Query+Parser
The focus on mm may indeed be a classic "XY Problem" - a premature focus
on a solution without detailing the problem.
-- Jack Krupansky
-----Original Message----- From: S.L
Sent: Sunday, March 30, 2014 11:18 AM
To: solr-user@lucene.apache.org
Subject: Re: eDismax parser and the mm parameter
Thanks Jack! I understand the intent of mm parameter, my question is that
since the query terms being provided are not of fixed length I do not
know
what the mm should like for example "Ginseng","Siberian Ginseng" are my
search terms. The first one can have an mm upto 1 and the second one can
have an mm of upto 2 .
Should I dynamically set the mm based on the number of search terms in my
query ?
Thanks again.
On Sun, Mar 30, 2014 at 5:20 AM, Jack Krupansky <j...@basetechnology.com>
wrote:
1. Yes, the default for mm is 1.
2. It depends on what you are really trying to do - you haven't told us.
Generally, mm=1 is equivalent to q.op=OR, and mm=100% is equivalent to
q.op=AND.
Generally, use q.op unless you really know what you are doing.
Generally, the intent of mm is to set the minimum number of OR/SHOULD
clauses that must match on the top level of a query.
-- Jack Krupansky
-----Original Message----- From: S.L
Sent: Sunday, March 30, 2014 2:25 AM
To: solr-user@lucene.apache.org
Subject: eDismax parser and the mm parameter
Hi All,
I am planning to use the eDismax query parser in SOLR to give boost to
documents that have a phrase in their fields present. Now there is a mm
parameter in the edismax parser query , since the query typed by the
user
could be of any length (i.e. >=1) I would like to set the mm value to 1
.
I
have the following questions regarding this parameter.
1. Is it set to 1 by default ?
2. In my schema.xml the defaultOperator is set to "AND" should I set
it
to "OR" inorder for the edismax parser to be effective with a mm of 1?
Thanks in advance!
