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Phonemizer -- foʊnmaɪzɚ

The phonemizer allows simple phonemization of words and texts in many languages.
Provides both the phonemize command-line tool and the Python function phonemizer.phonemize. See function documentation.

It is based on four backends: espeak, espeak-mbrola, festival and segments. The backends have different properties and capabilities resumed in table below. The backend choice is let to the user.

espeak-ng is a Text-to-Speech software supporting a lot of languages and IPA (International Phonetic Alphabet) output.
espeak-ng-mbrola uses the SAMPA phonetic alphabet instead of IPA but does not preserve word boundaries.
festival is another Tex-to-Speech engine. Its phonemizer backend currently supports only American English. It uses a custom phoneset, but it allows tokenization at the syllable level.
segments is a Unicode tokenizer that build a phonemization from a grapheme to phoneme mapping provided as a file by the user.

	espeak	espeak-mbrola	festival	segments
phone set	IPA	SAMPA	custom	user defined
supported languages	100+	35	US English	user defined
processing speed	fast	slow	very slow	fast
phone tokens	✔️	✔️	✔️	✔️
syllable tokens	❌	❌	✔️	❌
word tokens	✔️	❌	✔️	✔️
punctuation preservation	✔️	❌	✔️	✔️
stressed phones	✔️	❌	❌	❌
tie	✔️	❌	❌	❌

Installation

Dependencies

You need python>=3.6. If you really need to use python2, use the phonemizer-1.0 release.

You need to install festival, espeak-ng and/or mbrola in order to use the corresponding phonemizer backends. Follow instructions for your system below.

on Debian/Unbuntu

To install dependencies, simply run sudo apt-get install festival espeak-ng mbrola.

When using the espeak-mbrola backend, additional mbrola voices must be installed (see here). List the installable voices with apt search mbrola.

on CentOS/Fedora

To install dependencies, simply run sudo yum install festival espeak-ng.

When using the espeak-mbrola backend, the mbrola binary and additional mbrola voices must be installed (see here).

on MacOS

espeak is available on brew at version 1.48: brew install espeak. If you want a more recent version you have to compile it from sources. To install festival, mbrola and additional mbrola voices, use the script provided here.

on Windows

Install espeak-ng with the .msi Windows installer provided with espeak releases. festival must be compiled from sources (see here and here). mbrola is not available for Windows.

Phonemizer

The simplest way is using pip:
```
  pip install phonemizer
```
OR install it from sources with:
```
git clone https://github.com/bootphon/phonemizer
cd phonemizer
python setup.py install
```
If you experiment an error such as ImportError: No module named setuptools during installation, refeer to issue #11.

Docker image

Alternatively you can run the phonemizer within docker, using the provided Dockerfile. To build the docker image, have a:

git clone https://github.com/bootphon/phonemizer
cd phonemizer
sudo docker build -t phonemizer .

Then run an interactive session with:

sudo docker run -it phonemizer /bin/bash

Testing

When installed from sources or whithin a Docker image, you can run the tests suite from the root phonemizer folder (once you installed pytest):

pip install pytest
pytest

Developers

The phonemizer project is open-source and is welcoming contributions from everyone. Please look at the contributors guidelines if you wish to contribute.

Citation

To refenrece the phonemizer in your own work, please cite the following JOSS paper.

@article{Bernard2021,
  doi = {10.21105/joss.03958},
  url = {https://doi.org/10.21105/joss.03958},
  year = {2021},
  publisher = {The Open Journal},
  volume = {6},
  number = {68},
  pages = {3958},
  author = {Mathieu Bernard and Hadrien Titeux},
  title = {Phonemizer: Text to Phones Transcription for Multiple Languages in Python},
  journal = {Journal of Open Source Software}
}

Python usage

In Python import the phonemize function with from phonemizer import phonemize. See the function documentation.

Advice for best performances

It is much more efficient to minimize the number of calls to the phonemize function. Indeed the initialization of the phonemization backend can be expensive, especially for espeak. In one exemple:

from phonemizer import phonemize

text = [line1, line2, ...]

# Do this:
phonemized = phonemize(text, ...)

# Not this:
phonemized = [phonemize(line, ...) for line in text]

# An alternative is to directly instanciate the backend and to call the
# phonemize function from it:
from phonemizer.backend import EspeakBackend
backend = EspeakBackend('en-us', ...)
phonemized = [backend.phonemize(line, ...) for line in text]

Exemple 1: phonemize a text with festival

The following exemple downloads a text and phonemizes it using the festival backend, preserving punctuation and using 4 jobs in parallel. The phones are not separated, words are separated by a space and syllables by |.

# need to pip install requests
import requests
from phonemizer import phonemize
from phonemizer.separator import Separator

# text is a list of 190 English sentences downloaded from github
url = (
    'https://gist.githubusercontent.com/CorentinJ/'
    '0bc27814d93510ae8b6fe4516dc6981d/raw/'
    'bb6e852b05f5bc918a9a3cb439afe7e2de570312/small_corpus.txt')
text = requests.get(url).content.decode()
text = [line.strip() for line in text.split('\n') if line]

# phn is a list of 190 phonemized sentences
phn = phonemize(
    text,
    language='en-us',
    backend='festival',
    separator=Separator(phone=None, word=' ', syllable='|'),
    strip=True,
    preserve_punctuation=True,
    njobs=4)

Exemple 2: build a lexicon with espeak

The following exemple extracts a list of words present in a text, ignoring punctuation, and builds a dictionary word: [phones], e.g. {'students': 's t uː d ə n t s', 'cobb': 'k ɑː b', 'its': 'ɪ t s', 'put': 'p ʊ t', ...}. We consider here the same text as in the previous exemple.

from phonemizer.backend import EspeakBackend
from phonemizer.punctuation import Punctuation
from phonemizer.separator import Separator

# remove all the punctuation from the text, condidering only the specified
# punctuation marks
text = Punctuation(';:,.!"?()-').remove(text)

# build the set of all the words in the text
words = {w.lower() for line in text for w in line.strip().split(' ') if w}

# initialize the espeak backend for English
backend = EspeakBackend('en-us')

# separate phones by a space and ignoring words boundaries
separator = Separator(phone=' ', word=None)

# build the lexicon by phonemizing each word one by one. The backend.phonemize
# function expect a list as input and outputs a list.
lexicon = {
    word: backend.phonemize([word], separator=separator, strip=True)[0]
    for word in words}

Command-line examples

The above examples can be run from Python using the phonemize function

For a complete list of available options, have a:

phonemize --help

See the installed backends with the --version option:

$ phonemize --version
phonemizer-3.0
available backends: espeak-ng-1.50, espeak-mbrola, festival-2.5.0, segments-2.1.3

Input/output exemples

from stdin to stdout:

$ echo "hello world" | phonemize
həloʊ wɜːld

Prepend the input text to output:

$ echo "hello world" | phonemize --prepend-text
hello world | həloʊ wɜːld

$ echo "hello world" | phonemize --prepend-text=';'
hello world ; həloʊ wɜːld

from file to stdout

$ echo "hello world" > hello.txt
$ phonemize hello.txt
həloʊ wɜːld

from file to file

$ phonemize hello.txt -o hello.phon --strip
$ cat hello.phon
həloʊ wɜːld

Backends

The default is to use espeak us-english:

$ echo "hello world" | phonemize
həloʊ wɜːld

$ echo "hello world" | phonemize -l en-us -b espeak
həloʊ wɜːld

$ echo 'hello world' | phonemize -l en-us -b espeak --tie
həlo͡ʊ wɜːld

Use festival US English instead

$ echo "hello world" | phonemize -l en-us -b festival
hhaxlow werld

In French, using espeak and espeak-mbrola, with custom token separators (see below). espeak-mbrola does not support words separation.

$ echo "bonjour le monde" | phonemize -b espeak -l fr-fr -p ' ' -w '/w '
b ɔ̃ ʒ u ʁ /w l ə /w m ɔ̃ d /w

$ echo "bonjour le monde" | phonemize -b espeak-mbrola -l mb-fr1 -p ' ' -w '/w '
b o~ Z u R l @ m o~ d

In Japanese, using segments

$ echo 'konnichiwa' | phonemize -b segments -l japanese
konnitʃiwa

$ echo 'konnichiwa' | phonemize -b segments -l ./phonemizer/share/japanese.g2p
konnitʃiwa

Supported languages

The exhaustive list of supported languages is available with the command phonemize --list-languages [--backend <backend>].

Languages supported by espeak are available here.
Languages supported by espeak-mbrola are available here. Please note that the mbrola voices are not bundled with the phonemizer nor the mbrola binary and must be installed separately.
Languages supported by festival are:
```
en-us -> english-us
```

Languages supported by the segments backend are:

chintang  -> ./phonemizer/share/segments/chintang.g2p
cree      -> ./phonemizer/share/segments/cree.g2p
inuktitut -> ./phonemizer/share/segments/inuktitut.g2p
japanese  -> ./phonemizer/share/segments/japanese.g2p
sesotho   -> ./phonemizer/share/segments/sesotho.g2p
yucatec   -> ./phonemizer/share/segments/yucatec.g2p

Instead of a language you can also provide a file specifying a grapheme to phone mapping (see the files above for examples).

Token separators

You can specify separators for phones, syllables (festival only) and words (excepted espeak-mbrola).

$ echo "hello world" | phonemize -b festival -w ' ' -p ''
hhaxlow werld

$ echo "hello world" | phonemize -b festival -p ' ' -w ''
hh ax l ow w er l d

$ echo "hello world" | phonemize -b festival -p '-' -s '|'
hh-ax-l-|ow-| w-er-l-d-|

$ echo "hello world" | phonemize -b festival -p '-' -s '|' --strip
hh-ax-l|ow w-er-l-d

$ echo "hello world" | phonemize -b festival -p ' ' -s ';esyll ' -w ';eword '
hh ax l ;esyll ow ;esyll ;eword w er l d ;esyll ;eword

You cannot specify the same separator for several tokens (for instance a space for both phones and words):

$ echo "hello world" | phonemize -b festival -p ' ' -w ' '
fatal error: illegal separator with word=" ", syllable="" and phone=" ",
must be all differents if not empty

Punctuation

By default the punctuation is removed in the phonemized output. You can preserve it using the --preserve-punctuation option (not supported by the espeak-mbrola backend):

$ echo "hello, world!" | phonemize --strip
həloʊ wɜːld

$ echo "hello, world!" | phonemize --preserve-punctuation --strip
həloʊ, wɜːld!

Espeak specific options

The espeak backend can output the stresses on phones:

$ echo "hello world" | phonemize -l en-us -b espeak --with-stress
həlˈoʊ wˈɜːld

The espeak backend can add tie on multi-characters phonemes:

$ echo "hello world" | phonemize -l en-us -b espeak --tie
həlo͡ʊ wɜːld

⚠️ The espeak backend can switch languages during phonemization (below from French to English), use the --language-switch option to deal with it:

$ echo "j'aime le football" | phonemize -l fr-fr -b espeak --language-switch keep-flags
[WARNING] fount 1 utterances containing language switches on lines 1
[WARNING] extra phones may appear in the "fr-fr" phoneset
[WARNING] language switch flags have been kept (applying "keep-flags" policy)
ʒɛm lə- (en)fʊtbɔːl(fr)

$ echo "j'aime le football" | phonemize -l fr-fr -b espeak --language-switch remove-flags
[WARNING] fount 1 utterances containing language switches on lines 1
[WARNING] extra phones may appear in the "fr-fr" phoneset
[WARNING] language switch flags have been removed (applying "remove-flags" policy)
ʒɛm lə- fʊtbɔːl

$ echo "j'aime le football" | phonemize -l fr-fr -b espeak --language-switch remove-utterance
[WARNING] removed 1 utterances containing language switches (applying "remove-utterance" policy)

⚠️ The espeak backend sometimes merge words together in the output, use the --words-mismatch option to deal with it:

$ echo "that's it, words are merged" | phonemize -l en-us -b espeak
[WARNING] words count mismatch on 100.0% of the lines (1/1)
ðætsɪt wɜːdz ɑːɹ mɜːdʒd

Licence

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

EsOff/phonemizer