About: Inside–outside–beginning (tagging)

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The IOB format (short for inside, outside, beginning), also commonly referred to as the BIO format, is a common tagging format for tagging tokens in a chunking task in computational linguistics (ex. named-entity recognition). It was presented by Ramshaw and Marcus in their paper "Text Chunking using Transformation-Based Learning", 1995 The I- prefix before a tag indicates that the tag is inside a chunk. An O tag indicates that a token belongs to no chunk. The B- prefix before a tag indicates that the tag is the beginning of a chunk that immediately follows another chunk without O tags between them. It is used only in that case: when a chunk comes after an O tag, the first token of the chunk takes the I- prefix.

Attributes	Values
rdfs:label	Inside–outside–beginning (tagging) (en)
rdfs:comment	The IOB format (short for inside, outside, beginning), also commonly referred to as the BIO format, is a common tagging format for tagging tokens in a chunking task in computational linguistics (ex. named-entity recognition). It was presented by Ramshaw and Marcus in their paper "Text Chunking using Transformation-Based Learning", 1995 The I- prefix before a tag indicates that the tag is inside a chunk. An O tag indicates that a token belongs to no chunk. The B- prefix before a tag indicates that the tag is the beginning of a chunk that immediately follows another chunk without O tags between them. It is used only in that case: when a chunk comes after an O tag, the first token of the chunk takes the I- prefix. (en)
dcterms:subject	Computational linguistics
Wikipage page ID	40324167 (xsd:integer)
Wikipage revision ID	1102105633 (xsd:integer)
Link from a Wikipage to another Wikipage	Natural language processing Lexical token Stop words Computational linguistics Chunk (information) Chunking (computational linguistics) JSON Computational linguistics XML Named-entity recognition
sameAs	Inside–outside–beginning (tagging) Inside–outside–beginning (tagging) Inside–outside–beginning (tagging)
dbp:wikiPageUsesTemplate	dbt:Reflist dbt:Use_dmy_dates dbt:Context dbt:Pre
has abstract	The IOB format (short for inside, outside, beginning), also commonly referred to as the BIO format, is a common tagging format for tagging tokens in a chunking task in computational linguistics (ex. named-entity recognition). It was presented by Ramshaw and Marcus in their paper "Text Chunking using Transformation-Based Learning", 1995 The I- prefix before a tag indicates that the tag is inside a chunk. An O tag indicates that a token belongs to no chunk. The B- prefix before a tag indicates that the tag is the beginning of a chunk that immediately follows another chunk without O tags between them. It is used only in that case: when a chunk comes after an O tag, the first token of the chunk takes the I- prefix. Another similar format which is widely used is IOB2 format, which is the same as the IOB format except that the B- tag is used in the beginning of every chunk (i.e. all chunks start with the B- tag). A readable introduction to entity tagging is given in Bob Carpenter's blog post, "Coding Chunkers as Taggers". An example with IOB format: Alex I-PERis Ogoing Oto OLos I-LOCAngeles I-LOCin OCalifornia I-LOC Notice how "Alex", "Los" and "California", although first tokens of their chunk, have the "I-" prefix. The same example after filtering out stop words: Alex I-PERgoing OLos I-LOCAngeles I-LOCCalifornia B-LOC Notice how "California" now has the "B-" prefix, because it immediately follows another LOC chunk. The same example with IOB2 format (with tagging unaffected by stop word filtering): Alex B-PERis Ogoing Oto OLos B-LOCAngeles I-LOCin OCalifornia B-LOC Related tagging schemes sometimes include "START/END: This consists of the tags B, E, I, S or O where S is used to represent a chunk containing a single token. Chunks of length greater than or equal to two always start with the B tag and end with the E tag." Other Tagging Scheme's include BIOES/BILOU, where 'E' and 'L' denotes Last or Ending character is such a sequence and 'S' denotes Single element or 'U' Unit element. An Example with BIOES format: Alex S-PERis Ogoing Owith OMarty B-PERA. I-PERRick E-PERto OLos B-LOCAngeles E-LOC (en)
prov:wasDerivedFrom	wikipedia-en:Inside–outside–beginning_(tagging)?oldid=1102105633&ns=0
page length (characters) of wiki page	5829 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Inside–outside–beginning_(tagging)
is Link from a Wikipage to another Wikipage of	Inside-outside-beginning (tagging) Inside Outside Beginning
is Wikipage redirect of	Inside-outside-beginning (tagging) Inside Outside Beginning
is foaf:primaryTopic of	wikipedia-en:Inside–outside–beginning_(tagging)

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