Update `datasets` metadata

430b586 over 1 year ago

No virus

7.03 kB

	---
	language:
	- de
	library_name: nemo
	datasets:
	- VoxPopuli-(DE)
	- multilingual_librispeech
	- mozilla-foundation/common_voice_7_0
	thumbnail: null
	tags:
	- automatic-speech-recognition
	- speech
	- audio
	- CTC
	- Conformer
	- Transformer
	- pytorch
	- NeMo
	- hf-asr-leaderboard
	license: cc-by-4.0
	widget:
	- example_title: Librispeech sample 1
	src: https://cdn-media.huggingface.co/speech_samples/sample1.flac
	- example_title: Librispeech sample 2
	src: https://cdn-media.huggingface.co/speech_samples/sample2.flac
	model-index:
	- name: stt_de_conformer_transducer_large
	results:
	- task:
	type: Automatic Speech Recognition
	name: speech-recognition
	dataset:
	name: common-voice-7-0
	type: mozilla-foundation/common_voice_7_0
	config: de
	split: test
	args:
	language: de
	metrics:
	- name: Test WER
	type: wer
	value: 4.93
	- task:
	type: Automatic Speech Recognition
	name: automatic-speech-recognition
	dataset:
	name: Multilingual LibriSpeech
	type: facebook/multilingual_librispeech
	config: german
	split: test
	args:
	language: de
	metrics:
	- name: Test WER
	type: wer
	value: 3.85
	- task:
	type: Automatic Speech Recognition
	name: automatic-speech-recognition
	dataset:
	name: Vox Populi
	type: polinaeterna/voxpopuli
	args:
	language: de
	metrics:
	- name: Test WER
	type: wer
	value: 5.7
	---

	# NVIDIA Conformer-Transducer Large (de)

	<style>
	img {
	display: inline;
	}
	</style>

	\| [![Model architecture](https://img.shields.io/badge/Model_Arch-Conformer--Transducer-lightgrey#model-badge)](#model-architecture)
	\| [![Model size](https://img.shields.io/badge/Params-120M-lightgrey#model-badge)](#model-architecture)
	\| [![Language](https://img.shields.io/badge/Language-de-lightgrey#model-badge)](#datasets)


	This model transcribes speech in lower case German alphabet along with spaces.
	It is a "large" versions of Conformer-Transducer (around 120M parameters) model.
	See the [model architecture](#model-architecture) section and [NeMo documentation](https://docs.nvidia.com/deeplearning/nemo/user-guide/docs/en/main/asr/models.html#conformer-transducer) for complete architecture details.

	## NVIDIA NeMo: Training

	To train, fine-tune or play with the model you will need to install [NVIDIA NeMo](https://github.com/NVIDIA/NeMo). We recommend you install it after you've installed latest Pytorch version.
	```
	pip install nemo_toolkit['all']
	```

	## How to Use this Model

	The model is available for use in the NeMo toolkit [3], and can be used as a pre-trained checkpoint for inference or for fine-tuning on another dataset.

	### Automatically instantiate the model

	```python
	import nemo.collections.asr as nemo_asr
	asr_model = nemo_asr.models.EncDecRNNTBPEModel.from_pretrained("nvidia/stt_de_conformer_transducer_large")
	```

	### Transcribing using Python
	First, let's get a sample
	```
	wget https://dldata-public.s3.us-east-2.amazonaws.com/2086-149220-0033.wav
	```
	Then simply do:
	```
	asr_model.transcribe(['2086-149220-0033.wav'])
	```

	### Transcribing many audio files

	```shell
	python [NEMO_GIT_FOLDER]/examples/asr/transcribe_speech.py
	pretrained_name="nvidia/stt_de_conformer_transducer_large"
	audio_dir="<DIRECTORY CONTAINING AUDIO FILES>"
	```

	### Input

	This model accepts 16000 KHz Mono-channel Audio (wav files) as input.

	### Output

	This model provides transcribed speech as a string for a given audio sample.

	## Model Architecture

	Conformer-Transducer model is an autoregressive variant of Conformer model [1] for Automatic Speech Recognition which uses Transducer loss/decoding instead of CTC Loss. You may find more info on the detail of this model here: [Conformer-Transducer Model](https://docs.nvidia.com/deeplearning/nemo/user-guide/docs/en/main/asr/models.html).

	## Training

	The NeMo toolkit [3] was used for training the models for over several hundred epochs. These model are trained with this [example script](https://github.com/NVIDIA/NeMo/blob/main/examples/asr/asr_ctc/speech_to_text_ctc_bpe.py) and this [base config](https://github.com/NVIDIA/NeMo/blob/main/examples/asr/conf/conformer/conformer_ctc_bpe.yaml).

	The tokenizers for these models were built using the text transcripts of the train set with this [script](https://github.com/NVIDIA/NeMo/blob/main/scripts/tokenizers/process_asr_text_tokenizer.py).

	### Datasets

	All the models in this collection are trained on a composite dataset (NeMo ASRSET) comprising of several thousand hours of German speech:

	- VoxPopuli (DE) 200 hrs subset
	- Multilingual Librispeech (MLS DE) - 1500 hrs subset
	- Mozilla Common Voice (v7.0)

	Note: older versions of the model may have trained on smaller set of datasets.

	## Performance

	The list of the available models in this collection is shown in the following table. Performances of the ASR models are reported in terms of Word Error Rate (WER%) with greedy decoding.

	\| Version \| Tokenizer \| Vocabulary Size \| MCV7.0 dev \| MCV7.0 test \| MLS dev \| MLS test \| Voxpopuli dev \| Voxpopuli test \|
	\|---------\|-----------------------\|-----------------\|---------------\|---------------\|------------\|-----------\|------------\|----------------\|
	\| 1.6.0 \| SentencePiece Unigram \| 1024 \| 4.40 \| 4.93 \| 3.22 \| 3.85 \| 11.04 \| 8.85 \|

	## Limitations
	Since this model was trained on publicly available speech datasets, the performance of this model might degrade for speech which includes technical terms, or vernacular that the model has not been trained on. The model might also perform worse for accented speech.

	## NVIDIA Riva: Deployment

	[NVIDIA Riva](https://developer.nvidia.com/riva), is an accelerated speech AI SDK deployable on-prem, in all clouds, multi-cloud, hybrid, on edge, and embedded.
	Additionally, Riva provides:

	* World-class out-of-the-box accuracy for the most common languages with model checkpoints trained on proprietary data with hundreds of thousands of GPU-compute hours
	* Best in class accuracy with run-time word boosting (e.g., brand and product names) and customization of acoustic model, language model, and inverse text normalization
	* Streaming speech recognition, Kubernetes compatible scaling, and enterprise-grade support

	Although this model isn’t supported yet by Riva, the [list of supported models is here](https://huggingface.co/models?other=Riva).
	Check out [Riva live demo](https://developer.nvidia.com/riva#demos).

	## References
	[1] [Conformer: Convolution-augmented Transformer for Speech Recognition](https://arxiv.org/abs/2005.08100)
	[2] [Google Sentencepiece Tokenizer](https://github.com/google/sentencepiece)
	[3] [NVIDIA NeMo Toolkit](https://github.com/NVIDIA/NeMo)

	## Licence

	License to use this model is covered by the [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/). By downloading the public and release version of the model, you accept the terms and conditions of the [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/) license.