mecabOptions
Options for MeCab tokenization
Description
A mecabOptions
object specifies additional options for
tokenizing Japanese and Korean text.
To tokenize using the specified MeCab tokenization options, use the 'TokenizeMethod'
option of tokenizedDocument
.
Creation
Description
creates a MeCab
tokenization option set with the default values for tokenizing Japanese.options
= mecabOptions
additionally sets additional Properties using one or
more name-value pair arguments.options
= mecabOptions(Name,Value
)
Properties
Model
— Path to trained model
string scalar | character vector
Path to trained model (MeCab dictionary), specified as a string scalar or a character vector.
The default value is a path to the internal dictionary for Japanese tokenization.
Example: "C:\myDict"
Data Types: char
| string
UserModel
— Files containing model extensions
""
(default) | string array | character vector | cell array of character vectors
Files containing model extensions (MeCab user dictionary .dic
files), specified as a string array, a character vector, or a cell array of character
vectors.
Example: "C:\myFile.dic"
Data Types: char
| string
| cell
LemmaExtractor
— Function extracting lemma from MeCab reply
@textanalytics.ja.mecabToLemma
(default) | function handle
Function extracting lemma from MeCab reply, specified as a function handle.
The function must have the form lemmata = fun(words,info)
, where
words
is a string vector of tokens and info
is a
struct with the following fields:
Feature
– String vector of tokens of the same size aswords
containing the MeCab output lines in ChaSen format without the split tokens themselves.PartOfSpeech
– Numerical code used inside the dictionary for the part-of-speech classification.
The output lemmata
is a string array of the same size as
words
containing the extracted lemmata.
The default lemma extractor is the textanalytics.ja.mecabToLemma
function.
Data Types: function_handle
POSExtractor
— Function extracting part-of-speech information from MeCab reply
@textanalytics.ja.mecabToPOS
(default) | function handle
Function extracting part-of-speech information from MeCab reply, specified as a function handle.
The function must have the form posTags = fun(words,info)
, where
words
is a string vector of tokens and info
is a
struct with the following fields:
Feature
– String vector of tokens of the same size aswords
containing the MeCab output lines in ChaSen format without the split tokens themselves.PartOfSpeech
– Numerical code used inside the dictionary for the part-of-speech classification.
The output posTags
is a categorical array of the same
size as words
containing the extracted part-of-speech tags from the
following categories:
adjective
adposition
adverb
auxiliary-verb
coord-conjunction
determiner
interjection
noun
numeral
pronoun
proper-noun
punctuation
symbol
verb
other
The default part-of-speech information extractor is the textanalytics.ja.mecabToPOS
function.
Data Types: function_handle
NERExtractor
— Function extracting named entity information from MeCab reply
@textanalytics.ja.mecabToNER
(default) | function handle
Function extracting named entity information from MeCab reply, specified as a function handle.
The function must have the form entities = fun(words,info)
, where
words
is a string vector of tokens and info
is a
struct with the following fields:
Feature
– String vector of tokens of the same size aswords
containing the MeCab output lines in ChaSen format without the split tokens themselves.PartOfSpeech
– Numerical code used inside the dictionary for the part-of-speech classification.
The output entities
is a categorical array of the same
size as words
containing the extracted entities from the following categories:
non-entity
person
organization
location
other
The default part-of-speech information extractor is the textanalytics.ja.mecabToNER
function.
Data Types: function_handle
Examples
Create MeCab Options Object
Create a MecabOptions
object containing the default options for Japanese tokenization.
options = mecabOptions
options = MecabOptions with properties: Model: "C:\Program Files\MATLAB\R2023a\sys\share\dict-ipadic" UserModel: "" LemmaExtractor: @textanalytics.ja.mecabToLemma POSExtractor: @textanalytics.ja.mecabToPOS NERExtractor: @textanalytics.ja.mecabToNER
Specify MeCab User Dictionary for Tokenization
Tokenize Japanese text using custom MeCab options.
Create a string array of Japanese text.
str = [ "恋に悩み、苦しむ。" "恋の悩みで苦しむ。" "空に星が輝き、瞬いている。" "空の星が輝きを増している。"];
Create a MecabOptions
object and specify a user model as a .dic
file using the 'UserModel'
option.
options = mecabOptions('UserModel','myFile.dic')
options = MecabOptions with properties: Model: "C:\Program Files\MATLAB\R2023a\sys\share\dict-ipadic" UserModel: "myFile.dic" LemmaExtractor: @textanalytics.ja.mecabToLemma POSExtractor: @textanalytics.ja.mecabToPOS NERExtractor: @textanalytics.ja.mecabToNER
Tokenize the text using the specified options using the 'TokenizeMethod'
option.
documents = tokenizedDocument(str,'TokenizeMethod',options)
documents = 4×1 tokenizedDocument: 6 tokens: 恋 に 悩み 、 苦しむ 。 6 tokens: 恋 の 悩み で 苦しむ 。 10 tokens: 空 に 星 が 輝き 、 瞬い て いる 。 10 tokens: 空 の 星 が 輝き を 増し て いる 。
Version History
Introduced in R2019b
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