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README.md
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---
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language: "en"
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thumbnail:
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tags:
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- ASR
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- CTC
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- Attention
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- Transformers
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- pytorch
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license: "apache-2.0"
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datasets:
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- librispeech
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metrics:
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- wer
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- cer
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---
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# Transformer for AISHELL (Mandarin Chinese)
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This repository provides all the necessary tools to perform automatic speech
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recognition from an end-to-end system pretrained on AISHELL (Mandarin Chinese)
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within SpeechBrain. For a better experience, we encourage you to learn more about
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[SpeechBrain](https://speechbrain.github.io). The given ASR model performance are:
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| Release | Dev CER | Test CER | GPUs | Full Results |
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|:-------------:|:--------------:|:--------------:|:--------:|:--------:|
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| 05-03-21 | 5.60 | 6.04 | 2xV100 32GB | [Google Drive](https://drive.google.com/drive/folders/1zlTBib0XEwWeyhaXDXnkqtPsIBI18Uzs?usp=sharing)|
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## Pipeline description
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This ASR system is composed of 2 different but linked blocks:
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1. Tokenizer (unigram) that transforms words into subword units and trained with
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the train transcriptions of LibriSpeech.
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2. Acoustic model made of a transformer encoder and a joint decoder with CTC +
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transformer. Hence, the decoding also incorporates the CTC probabilities.
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To Train this system from scratch, [see our SpeechBrain recipe](https://github.com/speechbrain/speechbrain/tree/develop/recipes/AISHELL-1).
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## Intended uses & limitations
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This model has been primarily developed to be run within SpeechBrain as a pretrained ASR model
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for the Mandarin Chinese language. Thanks to the flexibility of SpeechBrain, any of the 3 blocks
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detailed above can be extracted and connected to your custom pipeline as long as SpeechBrain is
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installed.
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## Install SpeechBrain
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First of all, please install SpeechBrain with the following command:
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```
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pip install speechbrain
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```
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Please notice that we encourage you to read our tutorials and learn more about
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[SpeechBrain](https://speechbrain.github.io).
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### Transcribing your own audio files (in English)
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```python
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from speechbrain.pretrained import TransformerASR
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asr_model = TransformerASR.from_hparams(source="speechbrain/asr-transformer-aishell", savedir="pretrained_models/asr-transformer-aishell")
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asr_model.transcribe_file("speechbrain/asr-transformer-aishell/example.wav")
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```
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#### Referencing SpeechBrain
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```
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@misc{SB2021,
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author = {Ravanelli, Mirco and Parcollet, Titouan and Rouhe, Aku and Plantinga, Peter and Rastorgueva, Elena and Lugosch, Loren and Dawalatabad, Nauman and Ju-Chieh, Chou and Heba, Abdel and Grondin, Francois and Aris, William and Liao, Chien-Feng and Cornell, Samuele and Yeh, Sung-Lin and Na, Hwidong and Gao, Yan and Fu, Szu-Wei and Subakan, Cem and De Mori, Renato and Bengio, Yoshua },
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title = {SpeechBrain},
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year = {2021},
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publisher = {GitHub},
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journal = {GitHub repository},
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howpublished = {\\\\url{https://github.com/speechbrain/speechbrain}},
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}
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```
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