Difference between revisions of "Tagger"
m (→Comments) |
(Marked as {{ref}}) |
||
| (One intermediate revision by one other user not shown) | |||
| Line 3: | Line 3: | ||
==Comments== | ==Comments== | ||
| − | In most cases, a tagger assigns tags representing morpho-syntactic information to single word-forms or | + | In most cases, a tagger assigns tags representing morpho-syntactic information to single word-forms or tokens. But there are also taggers which have been designed to identify semantic roles of noun phrases or prepositional phrases ([[sense tagging]]), and sometimes identifying the structure of a text is considered as a kind of tagging ([[discourse structure tagging]]). |
Conceptually, tagging can be considered as a three step process: (i). identification of the relevant units (ii). assigning all possible labels (e.g. by lexical look-up, applying heuristics, etc.) (iii). disambiguation. | Conceptually, tagging can be considered as a three step process: (i). identification of the relevant units (ii). assigning all possible labels (e.g. by lexical look-up, applying heuristics, etc.) (iii). disambiguation. | ||
| − | It is common practice to distinguish between rule-based and stochastic | + | It is common practice to distinguish between rule-based and stochastic taggers, though some taggers combine rules and stochastic information. |
| − | In general, state-of-the-art | + | In general, state-of-the-art taggers achieve a precision of at least 95% for morpho-syntactic tagging. |
==Subtypes== | ==Subtypes== | ||
| Line 21: | Line 21: | ||
* German [[Tagger (de)]] | * German [[Tagger (de)]] | ||
| − | {{dc}} | + | {{dc}}{{ref}} |
[[Category:Computational Linguistics]] | [[Category:Computational Linguistics]] | ||
Latest revision as of 16:30, 27 July 2014
Definition
A tagger is a device which assigns symbolic labels (tags) to linguistics units. The labels are taken from a predefined set of symbols (the so-called tag-set).
Comments
In most cases, a tagger assigns tags representing morpho-syntactic information to single word-forms or tokens. But there are also taggers which have been designed to identify semantic roles of noun phrases or prepositional phrases (sense tagging), and sometimes identifying the structure of a text is considered as a kind of tagging (discourse structure tagging).
Conceptually, tagging can be considered as a three step process: (i). identification of the relevant units (ii). assigning all possible labels (e.g. by lexical look-up, applying heuristics, etc.) (iii). disambiguation.
It is common practice to distinguish between rule-based and stochastic taggers, though some taggers combine rules and stochastic information.
In general, state-of-the-art taggers achieve a precision of at least 95% for morpho-syntactic tagging.
Subtypes
Other Languages
- German Tagger (de)
| REF | This article has no reference(s) or source(s). Please remove this block only when the problem is solved. |
