Text germansnowballstemmer

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GermanSnowballStemmer

German stemming by the Snowball algorithm.

public static class GermanSnowballStemmer

Example — a noun's case endings, collapsed.

using Lodestar.Text.Stemming;

string nominative = GermanSnowballStemmer.Stem("kind");  // => kind
string plural = GermanSnowballStemmer.Stem("kinder");  // => kind
string dative = GermanSnowballStemmer.Stem("kindern");  // => kind

Remarks — German differs from the Romance stemmers here in three ways worth knowing before reading a stem.

ß becomes ss first, so the two spellings of a word cannot produce two keys: straße and strasse both stem to strass. Umlauts are removed at the end, once the suffix rules have run, which is why größe comes back as gross rather than größ.

And there is no RV region — the algorithm uses R1 and R2 only, with R1 floored at three characters. That floor is what stops short words from being trimmed to nothing, the job RV does in the Romance languages.

Compound nouns are not split. Donaudampfschiff is one word to this algorithm and comes back as one stem; splitting German compounds needs a dictionary, and none ships here.

Reference behaviour is nltk.stem.snowball.SnowballStemmer("german"), matched over 88 words.

Applies to — net10.0, netstandard2.0.

See also — the stemming index.

Members

Member	What it does
GermanSnowballStemmer.Stem	The Snowball stem of one German word.