lucenenet-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Björn Kremer <...@patorg.de>
Subject Re: [Lucene.Net] optimisation for the GermanStemmer.vb
Date Mon, 16 Jan 2012 10:28:34 GMT
Hello,

of course you are right. They should have the same root. But on the over 
hand, most of my customers are very interessted in searching "ae" as "ä".
Maybe the DIN norm 5007-2 is a solution: "ä" is converted to "a" and 
"ae" is also converted to "a". So the words have the same root and my 
customers can also search "ae" as "ä".

I'm sorry I have no test data at the moment. But if you like my idea you 
can also use/offer it for java lucene.

Thank You
Björn

Am 13.01.2012 21:55, schrieb Robert Jordan:
> Hi,
>
> With your patch, words like
>
> Haus
> Häuser
>
> will have different a root.
>
> How did you test your changes? Can you provide some statistics,
> like how many over- and understemming your patch will produce
> for a 50.000 words corpus?
>
> Anyway, such changes are likely not acceptable because they
> break the compatibility with Java Lucene and with existing indexes.
>
> Robert
>
> On 13.01.2012 16:27, Björn Kremer wrote:
>> Hello,
>>
>> I have a little optimisation for the GermanStemmer.vb (in
>> Contrib.Analyzers) class. At the moment the function "Substitute"
>> converts the german "Umlaute" "ä" in "a", "ö" in"o" and "ü" in "u". This
>> is not the correct german translation. They must be converted to "ae",
>> "oe" and "ue". So I can write the name "Björn" or "Bjoern" but not
>> "Bjorn". With this optimization a user can search for "Björn" and also
>> find "Bjoern".
>>
>> Here is the optimized code snippet:
>>
>> else if ( buffer[c] == 'ä' )
>> {
>> buffer[c] = 'a';
>> buffer.Insert(c + 1, 'e');
>> }
>> else if ( buffer[c] == 'ö' )
>> {
>> buffer[c] = 'o';
>> buffer.Insert(c + 1,'e');
>> }
>> else if ( buffer[c] == 'ü' )
>> {
>> buffer[c] = 'u';
>> buffer.Insert(c + 1,'e');
>> }
>>
>> Thank You
>> Björn
>>
>
>

Mime
View raw message