#
MMS

##
Overview

The MMS model was proposed in Scaling Speech Technology to 1,000+ Languages by Vineel Pratap, Andros Tjandra, Bowen Shi, Paden Tomasello, Arun Babu, Sayani Kundu, Ali Elkahky, Zhaoheng Ni, Apoorv Vyas, Maryam Fazel-Zarandi, Alexei Baevski, Yossi Adi, Xiaohui Zhang, Wei-Ning Hsu, Alexis Conneau, Michael Auli

The abstract from the paper is the following:

Expanding the language coverage of speech technology has the potential to improve access to information for many more people. However, current speech technology is restricted to about one hundred languages which is a small fraction of the over 7,000 languages spoken around the world. The Massively Multilingual Speech (MMS) project increases the number of supported languages by 10-40x, depending on the task. The main ingredients are a new dataset based on readings of publicly available religious texts and effectively leveraging self-supervised learning. We built pre-trained wav2vec 2.0 models covering 1,406 languages, a single multilingual automatic speech recognition model for 1,107 languages, speech synthesis models for the same number of languages, as well as a language identification model for 4,017 languages. Experiments show that our multilingual speech recognition model more than halves the word error rate of Whisper on 54 languages of the FLEURS benchmark while being trained on a small fraction of the labeled data.

Tips:

- MMS is a speech model that accepts a float array corresponding to the raw waveform of the speech signal. The raw waveform should be pre-processed with Wav2Vec2FeatureExtractor.
- MMS model was trained using connectionist temporal classification (CTC) so the model output has to be decoded using Wav2Vec2CTCTokenizer.
- MMS can load different language adapter weights for different languages via load_adapter(). Language adapters only consists of roughly 2 million parameters and can therefore be efficiently loaded on the fly when needed.

Relevant checkpoints can be found under https://huggingface.co/models?other=mms.

MMS’s architecture is based on the Wav2Vec2 model, so one can refer to Wav2Vec2’s documentation page.

The original code can be found here.

##
Inference

By default MMS loads adapter weights for English, but those can be easily switched out for another language. Let’s look at an example.

First, we load audio data in different languages using the Datasets.

    from datasets import load_dataset, Audio

    # English
    stream_data = load_dataset("mozilla-foundation/common_voice_13_0", "en", split="test", streaming=True)
    stream_data = stream_data.cast_column("audio", Audio(sampling_rate=16000))
    en_sample = next(iter(stream_data))["audio"]["array"]

    # French
    stream_data = load_dataset("mozilla-foundation/common_voice_13_0", "fr", split="test", streaming=True)
    stream_data = stream_data.cast_column("audio", Audio(sampling_rate=16000))
    fr_sample = next(iter(stream_data))["audio"]["array"]

Next, we load the model and processor

    from transformers import Wav2Vec2ForCTC, AutoProcessor
    import torch

    model_id = "facebook/mms-1b-all"

    processor = AutoProcessor.from_pretrained(model_id)
    model = Wav2Vec2ForCTC.from_pretrained(model_id)

Now we process the audio data, pass the processed audio data to the model and transcribe the model output, just like we usually do for Wav2Vec2ForCTC.

    inputs = processor(en_sample, sampling_rate=16_000, return_tensors="pt")

    with torch.no_grad():
        outputs = model(**inputs).logits

    ids = torch.argmax(outputs, dim=-1)[0]
    transcription = processor.decode(ids)
    # 'joe keton disapproved of films and buster also had reservations about the media'

We can now keep the same model in memory and simply switch out the language adapters by calling the convenient load_adapter() function for the model and set_target_lang() for the tokenizer. We pass the target language as an input - `"fra"` for French.

    processor.tokenizer.set_target_lang("fra")
    model.load_adapter("fra")

    inputs = processor(fr_sample, sampling_rate=16_000, return_tensors="pt")

    with torch.no_grad():
        outputs = model(**inputs).logits

    ids = torch.argmax(outputs, dim=-1)[0]
    transcription = processor.decode(ids)
    # "ce dernier est volé tout au long de l'histoire romaine"

In the same way the language can be switched out for all other supported languages. Please have a look at:

    processor.tokenizer.vocab.keys()

to see all supported languages.