Hi Björn,
On 16.01.2012 11:28, Björn Kremer wrote:
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".
Do you mean they like to search for Björn with "bjoern"? Indeed, this
won't work with the current stemmer.
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".
"ue" occurs pretty often as an infix (think of *steuer*): about 1.5%
of the words of the German aspell dictionary are affected. "ae" and
"oe" are rather seldom.
Still, it may be worth a try, because the stemmer doesn't work
morphologically anyway. It doesn't really matter if "steuer" is
stemmed as "steur" or "steu" as long as it's consistent.
Robert
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
