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stemmer 音標拼音: [st'ɛmɚ] 除梗機; 導火線; 炮棍 除梗機; 導火線; 炮棍 stemmer n 1: a worker who strips the stems from moistened tobacco leaves and binds the leaves together into books [ synonym: { stripper}, { stemmer}, { sprigger}] 2: a worker who makes or applies stems for artificial flowers 3: an algorithm for removing inflectional and derivational endings in order to reduce word forms to a common stem [ synonym: { stemmer}, { stemming algorithm}] 4: a miner' s tamping bar for ramming packing in over a blasting charge 5: a device for removing stems from fruit ( as from grapes or apples) Stemmer \ Stem" mer\, n. One who, or that which, stems ( in any of the senses of the verbs). [ 1913 Webster] A program or {algorithm}
which determines the morphological root of a given inflected
(or, sometimes, derived) word form -- generally a written word
form.
A stemmer for English, for example, should identify the
{string} "cats" (and possibly "catlike", "catty" etc.) as
based on the root "cat", and "stemmer", "stemming", "stemmed"
as based on "stem".
English stemmers are fairly {trivial} (with only occasional
problems, such as "dries" being the third-person singular
present form of the verb "dry", "axes" being the plural of
"ax" as well as "axis"); but stemmers become harder to design
as the morphology, orthography, and {character encoding} of
the target language becomes more complex. For example, an
Italian stemmer is more complex than an English one (because
of more possible verb inflections), a Russian one is more
complex (more possible noun declensions), a Hebrew one is even
more complex (a {hairy} writing system), and so on.
Stemmers are common elements in {query} systems, since a user
who runs a query on "daffodils" probably cares about documents
that contain the word "daffodil" (without the s).
({This dictionary} has a rudimentary stemmer which currently
(April 1997) handles only conversion of plurals to singulars).
(1997-04-09)
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