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@jemoka / Jemoka Knowledge Base / wiki/concepts/ner_tagging.md
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--- title: "NER Tagging" type: concept related: [Ner Tagging, Pos Tagging] source: https://www.jemoka.com/posts/kbhner_tagging/ confidence: high status: active --- while POS Tagging assigns tags to each word, NER Tagging tags the category of usage of multi-word spans. NER Tagging needs to label spans of text, which means that there is ambiguity in type. BIO Tagging BIO Tagging will tag each word: where \(B\) begins a span, \(I\), is inside a span, and \(O\) outside a span. So tags per word still apply, but we can extract span information as well. (job - gender + gender ) = job (captial - country + country) = captial