language:
- pt
license: apache-2.0
tags:
- whisper-event
- generated_from_trainer
datasets:
- mozilla-foundation/common_voice_11_0
metrics:
- wer
- cer
model-index:
- name: Whisper Large Portuguese
results:
- task:
name: Automatic Speech Recognition
type: automatic-speech-recognition
dataset:
name: mozilla-foundation/common_voice_11_0 pt
type: mozilla-foundation/common_voice_11_0
config: pt
split: test
args: pt
metrics:
- name: WER
type: wer
value: 4.816664144852979
- name: CER
type: cer
value: 1.6052355927195898
- task:
name: Automatic Speech Recognition
type: automatic-speech-recognition
dataset:
name: google/fleurs pt_br
type: google/fleurs
config: pt_br
split: test
args: pt_br
metrics:
- name: WER
type: wer
value: 8.56762285333714
- name: CER
type: cer
value: 5.462965196208485
Whisper Large Portuguese
This model is a fine-tuned version of openai/whisper-large-v2 on Portuguese using the train and validation splits of Common Voice 11. Not all validation split data were used during training, I extracted 1k samples from the validation split to be used for evaluation during fine-tuning. When using this model, make sure that your speech input is sampled at 16kHz.
Usage
from transformers import pipeline
transcriber = pipeline(
"automatic-speech-recognition",
model="jonatasgrosman/whisper-large-pt-cv11"
)
transcriber.model.config.forced_decoder_ids = (
transcriber.tokenizer.get_decoder_prompt_ids(
language="pt"
task="transcribe"
)
)
transcription = transcriber("path/to/my_audio.wav")
Evaluation
We perform evaluation of the model using the test split of two datasets, the Common Voice 11 (same dataset used for the fine-tuning) and the Fleurs (dataset not seen during the fine-tuning). As Whisper can transcribe casing and punctuation, I performed the model evaluation in 2 different scenarios, one using the raw text and the other using the normalized text (lowercase + removal of punctuations). Additionally, for the Fleurs dataset, I evaluated the model in a scenario where there are no transcriptions of numerical values since the way these values are described in this dataset is different from how they are described in the dataset used in fine-tuning (Common Voice), so it is expected that this difference in the way of describing numerical values will affect the performance of the model for this type of transcription in Fleurs.
Common Voice 11
| CER | WER | |
|---|---|---|
| jonatasgrosman/whisper-large-pt-cv11 | 2.52 | 9.56 |
| jonatasgrosman/whisper-large-pt-cv11 + text normalization | 1.60 | 4.82 |
| openai/whisper-large-v2 | 4.32 | 13.92 |
| openai/whisper-large-v2 + text normalization | 2.84 | 7.02 |
Fleurs
| CER | WER | |
|---|---|---|
| jonatasgrosman/whisper-large-pt-cv11 | 4.88 | 12.08 |
| jonatasgrosman/whisper-large-pt-cv11 + text normalization | 5.46 | 8.57 |
| jonatasgrosman/whisper-large-pt-cv11 + keep only non-numeric samples | 2.35 | 9.00 |
| jonatasgrosman/whisper-large-pt-cv11 + text normalization + keep only non-numeric samples | 3.36 | 6.05 |
| openai/whisper-large-v2 | 3.52 | 10.55 |
| openai/whisper-large-v2 + text normalization | 4.19 | 7.04 |
| openai/whisper-large-v2 + keep only non-numeric samples | 2.61 | 9.29 |
| openai/whisper-large-v2 + text normalization + keep only non-numeric samples | 3.56 | 6.15 |