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Vietnamese alignment

Pronunciation dictionaries

There are two ways to generate a pronunciation dictionary for aligning Vietnamese. The first is to use Michael McAuliffe's updated version of vPhon (original author: Jamese Kirby). This is a package that contains functions for transforming Vietnamese orthography into IPA. To use it, you will have to write a script like the generate_vn_dict.py script in this directory.

The second way is to use MFA's G2P capabilities and a pre-trained model to generate a dictionary. There is are two models. The first is a pre-trained G2P model for transforming Vietnamese orthography to IPA following vPhon's rules. This model was trained by extracting the list of words in the GlobalPhone dictionary, and then running vPhon on each entry to generate a new pronunciation dictionary. This model had an accuracy of 98.4% when validating on 10% of the dictionary and training on 90% of the dictionary (the actual models linked below use all of the dictionary as training). This dictionary was then used to train the G2P model. The second G2P model was trained on the original pronunciations that use GlobalPhone's phone set. This model had an accuracy of 98.0% when performing validation.

The commands for generating dictionaries using these models follow the MFA documentation (http://montreal-forced-aligner.readthedocs.io/en/stable/dictionary_generating.html):

bin/mfa_generate_dict /path/to/g2p_model.zip /path/to/corpus/directory /path/to/output/dictionary.txt

This command will inspect all TextGrid/lab files in the corpus directory, extract the set of lexical items, and generate pronunciations for each orthography. The new pronunciation dictionary is saved as a text file ready for use with MFA, but I recommend looking over the generated pronunciations and checking the generation as well as adding any additional pronunciations as necessary (often reduced forms, cases of non-transparent orthography, etc). The generate_vn_dict.py script has support for specifying a file of irregular pronunciations that will be incorporated into the dictionary that vPhon generates.

Brunelle Corpus reorganization

The reorganization.py script transforms the original TextGrids of the corpus of Southern Vietnamese that Marc Brunelle has into MFA format. Some of the TextGrids have speaker turns encoded in a tier, rather than a function of tier name, so this script regenerates TextGrids to have separate tiers for each speakers. Prior to running this script, I also deleted all tiers that were not relevant to alignment. See http://montreal-forced-aligner.readthedocs.io/en/stable/data_format.html#textgrid-format for more details on the input format.


Aligning a Vietnamese corpus is straightforward once the TextGrids are in the input format for MFA. Following the MFA documentation (http://montreal-forced-aligner.readthedocs.io/en/stable/aligning.html#align-using-only-the-data-set), the corpus can be aligned by:

bin/mfa_train_and_align /path/to/corpus/directory /path/to/pronunciation/dictionary.txt /path/to/output/directory

Here we use train and align to generate acoustic models based on the data set (these models can be saved for future use with the -o /path/to/save/model.zip flag). There are acoustic models based on the GlobalPhone Vietnamese corpus available here, but the speakers have a mix of dialects.