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Python version of Sudachi, the Japanese Morphological Analyzer

Project description

SudachiPy

PyPi version Build Status

SudachiPy is a Python version of Sudachi, a Japanese morphological analyzer.

TL;DR

$ pip install sudachipy sudachidict_core

$ echo "高輪ゲートウェイ駅" | sudachipy
高輪ゲートウェイ駅	名詞,固有名詞,一般,*,*,*	高輪ゲートウェイ駅
EOS

$ echo "高輪ゲートウェイ駅" | sudachipy -m A
高輪	名詞,固有名詞,地名,一般,*,*	高輪
ゲートウェイ	名詞,普通名詞,一般,*,*,*	ゲートウェー
駅	名詞,普通名詞,一般,*,*,*	駅
EOS

$ echo "空缶空罐空きカン" | sudachipy -a
空缶	名詞,普通名詞,一般,*,*,*	空き缶	空缶	アキカン	0
空罐	名詞,普通名詞,一般,*,*,*	空き缶	空罐	アキカン	0
空きカン	名詞,普通名詞,一般,*,*,*	空き缶	空きカン	アキカン	0
EOS

Setup

You need SudachiPy and a dictionary.

Step 1. Install SudachiPy

$ pip install sudachipy

Step 2. Get a Dictionary

You can get dictionary as a Python package. It make take a while to download the dictionary file (around 70MB for the core edition).

$ pip install sudachidict_core

Alternatively, you can choose other dictionary editions. See this section for the detail.

Usage: As a command

There is a CLI command sudachipy.

$ echo "外国人参政権" | sudachipy
外国人参政権	名詞,普通名詞,一般,*,*,*	外国人参政権
EOS
$ echo "外国人参政権" | sudachipy -m A
外国	名詞,普通名詞,一般,*,*,*	外国
人	接尾辞,名詞的,一般,*,*,*	人
参政	名詞,普通名詞,一般,*,*,*	参政
権	接尾辞,名詞的,一般,*,*,*	権
EOS
$ sudachipy tokenize -h
usage: sudachipy tokenize [-h] [-r file] [-m {A,B,C}] [-o file] [-a] [-d] [-v]
                          [file [file ...]]

Tokenize Text

positional arguments:
  file           text written in utf-8

optional arguments:
  -h, --help     show this help message and exit
  -r file        the setting file in JSON format
  -m {A,B,C}     the mode of splitting
  -o file        the output file
  -a             print all of the fields
  -d             print the debug information
  -v, --version  print sudachipy version

Output

Columns are tab separated.

  • Surface
  • Part-of-Speech Tags (comma separated)
  • Normalized Form

When you add the -a option, it additionally outputs

  • Dictionary Form
  • Reading Form
  • Dictionary ID
    • 0 for the system dictionary
    • 1 and above for the user dictionaries
    • -1\t(OOV) if a word is Out-of-Vocabulary (not in the dictionary)
$ echo "外国人参政権" | sudachipy -a
外国人参政権	名詞,普通名詞,一般,*,*,*	外国人参政権	外国人参政権	ガイコクジンサンセイケン	0
EOS
echo "阿quei" | sudachipy -a
阿	名詞,普通名詞,一般,*,*,*	阿	阿		-1	(OOV)
quei	名詞,普通名詞,一般,*,*,*	quei	quei		-1	(OOV)
EOS

Usage: As a Python package

Here is an example;

from sudachipy import tokenizer
from sudachipy import dictionary

tokenizer_obj = dictionary.Dictionary().create()
# Multi-granular Tokenization

mode = tokenizer.Tokenizer.SplitMode.C
[m.surface() for m in tokenizer_obj.tokenize("国家公務員", mode)]
# => ['国家公務員']

mode = tokenizer.Tokenizer.SplitMode.B
[m.surface() for m in tokenizer_obj.tokenize("国家公務員", mode)]
# => ['国家', '公務員']

mode = tokenizer.Tokenizer.SplitMode.A
[m.surface() for m in tokenizer_obj.tokenize("国家公務員", mode)]
# => ['国家', '公務', '員']
# Morpheme information

m = tokenizer_obj.tokenize("食べ", mode)[0]

m.surface() # => '食べ'
m.dictionary_form() # => '食べる'
m.reading_form() # => 'タベ'
m.part_of_speech() # => ['動詞', '一般', '*', '*', '下一段-バ行', '連用形-一般']
# Normalization

tokenizer_obj.tokenize("附属", mode)[0].normalized_form()
# => '付属'
tokenizer_obj.tokenize("SUMMER", mode)[0].normalized_form()
# => 'サマー'
tokenizer_obj.tokenize("シュミレーション", mode)[0].normalized_form()
# => 'シミュレーション'

(With 20200330 core dictionary. The results may change when you use other versions)

Dictionary Edition

There are three editions of Sudachi Dictionary, namely, small, core, and full. See WorksApplications/SudachiDict for the detail.

SudachiPy uses sudachidict_core by default. You can specify the dictionary with the link -t command.

$ pip install sudachidict_small
$ sudachipy link -t small
$ pip install sudachidict_full
$ sudachipy link -t full

You can remove the dictionary link with the link -u commnad.

$ sudachipy link -u

Dictionaries are installed as Python packages sudachidict_small, sudachidict_core, and sudachidict_full. SudachiPy tries to refer sudachidict package to use a dictionary. The link subcommand creates a symbolic link of sudachidict_* as sudachidict, to switch the packages.

The dictionary files are not in the package itself, but it is downloaded upon installation.

Dictionary in The Setting File

Alternatively, if the dictionary file is specified in the setting file, sudachi.json, SudachiPy will use that file.

{
    "systemDict" : "relative/path/to/system.dic",
    ...
}

The default setting file is sudachipy/resources/sudachi.json. You can specify your sudachi.json with the -r option.

$ sudachipy -r path/to/sudachi.json

User Dictionary

To use a user dictionary, user.dic, place sudachi.json to anywhere you like, and add userDict value with the relative path from sudachi.json to your user.dic.

{
    "userDict" : ["relative/path/to/user.dic"],
    ...
}

Then specify your sudachi.json with the -r option.

$ sudachipy -r path/to/sudachi.json

You can build a user dictionary with the subcommand ubuild.

WARNING: v0.3.* ubuild contains bug.

$ sudachipy ubuild -h
usage: sudachipy ubuild [-h] [-d string] [-o file] [-s file] file [file ...]

Build User Dictionary

positional arguments:
  file        source files with CSV format (one or more)

optional arguments:
  -h, --help  show this help message and exit
  -d string   description comment to be embedded on dictionary
  -o file     output file (default: user.dic)
  -s file     system dictionary (default: linked system_dic, see link -h)

About the dictionary file format, please refer to this document (written in Japanese, English version is not available yet).

Customized System Dictionary

$ sudachipy build -h
usage: sudachipy build [-h] [-o file] [-d string] -m file file [file ...]

Build Sudachi Dictionary

positional arguments:
  file        source files with CSV format (one of more)

optional arguments:
  -h, --help  show this help message and exit
  -o file     output file (default: system.dic)
  -d string   description comment to be embedded on dictionary

required named arguments:
  -m file     connection matrix file with MeCab's matrix.def format

To use your customized system.dic, place sudachi.json to anywhere you like, and overwrite systemDict value with the relative path from sudachi.json to your system.dic.

{
    "systemDict" : "relative/path/to/system.dic",
    ...
}

Then specify your sudachi.json with the -r option.

$ sudachipy -r path/to/sudachi.json

For Developers

Code Format

Run scripts/format.sh to check if your code is formatted correctly.

You need packages flake8 flake8-import-order flake8-buitins (See requirements.txt).

Test

Run scripts/test.sh to run the tests.

Contact

Sudachi and SudachiPy are developed by WAP Tokushima Laboratory of AI and NLP.

Open an issue, or come to our Slack workspace for questions and discussion.

https://sudachi-dev.slack.com/ (Get invitation here)

Enjoy tokenization!

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