Japanese Word Part-of-Speech Tags214

In Japanese natural language processing (NLP), word part-of-speech (POS) tagging is the process of assigning grammatical information to words in a sentence. POS tags provide valuable insights into the sentence structure and can be used for many NLP tasks, such as syntactic parsing, named entity recognition, and text classification.

There are various POS tag sets used in Japanese NLP, each with its own conventions. One of the most commonly used tag sets is the IPA Dictionary Tag Set, developed by the Information-Technology Promotion Agency, Japan (IPA). The IPA Dictionary Tag Set consists of 103 tags, which are divided into the following 15 categories:1. Noun (名詞)
2. Verb (動詞)
3. Adjective (形容詞)
4. Adverb (副詞)
5. Adnominal (連体詞)
6. Conjunction (接続詞)
7. Particle (助詞)
8. Interjection (感動詞)
9. Auxiliary verb (補助動詞)
10. Prefix (接頭辞)
11. Suffix (接尾辞)
12. Unclassified (未定義語)
13. Foreign word (外来語)
14. Symbol (記号)
15. Punctuation (句読点)

Each POS tag is assigned a unique two-digit number, as follows:| Category | Tag Number |
|---|---|
| Noun | 01-20 |
| Verb | 30-45 |
| Adjective | 50-59 |
| Adverb | 60-65 |
| Adnominal | 70-75 |
| Conjunction | 80-85 |
| Particle | 90-98 |
| Interjection | 99-100 |
| Auxiliary verb | 101-102 |
| Prefix | 103-104 |
| Suffix | 105-106 |
| Unclassified | 107-108 |
| Foreign word | 109-110 |
| Symbol | 111-115 |
| Punctuation | 116-122 |

In addition to the IPA Dictionary Tag Set, other popular POS tag sets for Japanese include the Universal Dependencies (UD) Tag Set, the Japanese GSD Tag Set, and the Kyoto University Text Corpus (KTC) Tag Set. The UD Tag Set is a cross-lingual tag set that is widely used in multilingual NLP research. The Japanese GSD Tag Set is a fine-grained tag set that is specifically designed for Japanese. The KTC Tag Set is a large-scale tag set that is derived from the Kyoto University Text Corpus.

POS tagging is a fundamental task in Japanese NLP. It is commonly performed using statistical models, such as hidden Markov models (HMMs) and conditional random fields (CRFs). Pre-trained POS taggers are also available for Japanese, which can be used to quickly and efficiently tag sentences with POS tags.

2024-12-10

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