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From: Alessandro Benedetti <abenedetti@apache.org>
Date: Wed, 23 Nov 2016 15:37:29 +0000
Message-ID: <CAB-fSbznO6rQVz08i7s3-opzdawu6OikStNm3sBMLW7RBBgChw@mail.gmail.com>
Subject: Re: negation search help
To: "solr-user@lucene.apache.org" <solr-user@lucene.apache.org>, Rafa Haro <rharo@apache.org>
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archived-at: Wed, 23 Nov 2016 15:37:33 -0000

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I add to the thread a friend of mine,
Rafa just presented at the Apachecon a medical system which deal exactly
with a negation engine ( he will publish the slides soon)
Hope it helps !

Cheers


On Wed, Nov 23, 2016 at 3:03 PM, Alexandre Rafalovitch <arafalov@gmail.com>
wrote:

> Well, then 'no' becomes a signal token. So, the question is how many
> tokens after that it affects in its circle of negation?
>
> You could probably use something like
> https://cwiki.apache.org/confluence/display/solr/Other+
> Parsers#OtherParsers-SurroundQueryParser
> to say (if user said 'headache').
> -{!surround} 3w(not, headache)
>
> But I am not sure how this would work in terms of multi-term queries.
>
> Alternatively, you could transform your input with custom token filter
> that, after seeing the term 'no', 'not', will just eat that and next
> n? tokens.
>
> Or you could run the sentences through natural language recognition
> and remove/mark noun phrases that are negative.
>
> What I am trying to say is that Solr can do a bunch of different
> things for you. But you first need to translate your domain problem
> into a much lower level pseudo-language problem that addresses your
> needs. Including the edge-cases, which none of us can guess from your
> description. Then you can implement it in Solr.
>
> Hope this helps,
>    Alex.
>
> ----
> http://www.solr-start.com/ - Resources for Solr users, new and experienced
>
>
> On 24 November 2016 at 01:43, Hem Naidu
> <hem.naidu@teschglobal.com.invalid> wrote:
> > Correct Alex. The use case is when provider searches on patient medical
> information for certain symptoms, the mentions likes "no headache" , "no
> blood loss", "not diabetic" should not show up in the search results.
> >
> > Thanks
> >
> >
> > -----Original Message-----
> > From: Alessandro Benedetti [mailto:benedetti.alex85@gmail.com]
> > Sent: Wednesday, November 23, 2016 8:22 AM
> > To: solr-user@lucene.apache.org
> > Subject: Re: negation search help
> >
> > Now that I read better, do you mean that at indexing time those
> negations must be recognized, in the way that they are no match ?
> >
> > Cheers
> >
> > On Wed, Nov 23, 2016 at 2:20 PM, Alessandro Benedetti <
> benedetti.alex85@gmail.com> wrote:
> >
> >> Hi Hem,
> >> are you expecting Solr to parse your natural language query out of the
> >> box ?
> >> Are you using any custom query parser ?
> >>
> >> If not, you need to follow the lucene Syntax to define engative queries.
> >>
> >> And be careful to the edge cases [1] .
> >>
> >> Cheers
> >>
> >> [1] https://wiki.apache.org/solr/NegativeQueryProblems
> >>
> >> On Wed, Nov 23, 2016 at 1:54 PM, Hem Naidu <hem.naidu@teschglobal.com.
> >> invalid> wrote:
> >>
> >>> Alex
> >>>
> >>> Whenever the keywords or sentence followed by "no", "not", etc should
> >>> be excluded from the search results. Does solr support this feature?
> >>>
> >>> Thanks
> >>>
> >>>
> >>> Sent from my iPhone
> >>>
> >>>
> >>> > On Nov 23, 2016, at 12:09 AM, Alexandre Rafalovitch
> >>> > <arafalov@gmail.com>
> >>> wrote:
> >>> >
> >>> > How do you _know_ it is not 'apparent' ? Is it because it is
> >>> > preceded by the keyword 'no'? Just that keyword? At what maximum
> distance?
> >>> >
> >>> > Regards,
> >>> >   Alex
> >>> >
> >>> > On 23 Nov 2016 2:59 PM, "Hem Naidu"
> >>> > <hem.naidu@teschglobal.com.invalid>
> >>> > wrote:
> >>> >
> >>> >> Gurus,
> >>> >>
> >>> >> I am new to Solr, I have a requirement to index entire pdf/word
> >>> documents
> >>> >> using Solr Tika. Which was successful and able to get the search
> >>> results
> >>> >> displayed. Now I need to fine tune the results or adjust index so
> >>> >> the negative statements should be filtered out the results like my
> >>> >> input
> >>> text
> >>> >> for index from the documents would be
> >>> >> -----------------------------------
> >>> >> Fortunately no concurrent trauma was found In no apparent distress
> >>> >> --------------------------------------
> >>> >>
> >>> >> If user searches for concurrent trauma or distress the search
> >>> >> engine
> >>> should
> >>> >> filter out the results as it not apparent symptom.
> >>> >>
> >>> >> Any help on whether Solr can do this?
> >>> >> If so, do I need to adjust the index or build custom queries?
> >>> >>
> >>> >> Any help on this would be greatly appreciated !
> >>> >>
> >>> >> Thanks
> >>> >>
> >>> >>
> >>> >>
> >>>
> >>
> >>
> >>
> >> --
> >> --------------------------
> >>
> >> Benedetti Alessandro
> >> Visiting card - http://about.me/alessandro_benedetti
> >> Blog - http://alexbenedetti.blogspot.co.uk
> >>
> >> "Tyger, tyger burning bright
> >> In the forests of the night,
> >> What immortal hand or eye
> >> Could frame thy fearful symmetry?"
> >>
> >> William Blake - Songs of Experience -1794 England
> >>
> >
> >
> >
> > --
> > --------------------------
> >
> > Benedetti Alessandro
> > Visiting card - http://about.me/alessandro_benedetti
> > Blog - http://alexbenedetti.blogspot.co.uk
> >
> > "Tyger, tyger burning bright
> > In the forests of the night,
> > What immortal hand or eye
> > Could frame thy fearful symmetry?"
> >
> > William Blake - Songs of Experience -1794 England
> >
>


-- 
--------------------------

Benedetti Alessandro
Visiting card : http://about.me/alessandro_benedetti

"Tyger, tyger burning bright
In the forests of the night,
What immortal hand or eye
Could frame thy fearful symmetry?"

William Blake - Songs of Experience -1794 England

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