transformers/docs/source/en/model_doc/whisper.md

Whisper

Overview

The Whisper model was proposed in Robust Speech Recognition via Large-Scale Weak Supervision by Alec Radford, Jong Wook Kim, Tao Xu, Greg Brockman, Christine McLeavey, Ilya Sutskever.

The abstract from the paper is the following:

We study the capabilities of speech processing systems trained simply to predict large amounts of transcripts of audio on the internet. When scaled to 680,000 hours of multilingual and multitask supervision, the resulting models generalize well to standard benchmarks and are often competitive with prior fully supervised results but in a zeroshot transfer setting without the need for any finetuning. When compared to humans, the models approach their accuracy and robustness. We are releasing models and inference code to serve as a foundation for further work on robust speech processing.

This model was contributed by Arthur Zucker. The Tensorflow version of this model was contributed by amyeroberts. The original code can be found here.

Quick usage

You can run Whisper in less than 4 lines of code and transcribe in less than a minute!

# pip install transformers torch

import torch
from transformers import pipeline

whisper = pipeline("automatic-speech-recognition", "openai/whisper-large-v3", torch_dtype=torch.float16, device="cuda:0")

transcription = whisper("<audio_file.mp3>")

print(transcription["text"])

Voila! You can swap the model with any Whisper checkpoints on the Hugging Face Hub with the same pipeline based on your needs.

Bonus: You can replace "cuda" with "mps" to make it seamlessly work on Macs.

Usage tips

• The model usually performs well without requiring any finetuning.

• The architecture follows a classic encoder-decoder architecture, which means that it relies on the [~generation.GenerationMixin.generate] function for inference.

• One can use [WhisperProcessor] to prepare audio for the model, and decode the predicted ID's back into text.

• To convert the model and the processor, we recommend using the following:

python src/transformers/models/whisper/convert_openai_to_hf.py --checkpoint_path "" --pytorch_dump_folder_path "Arthur/whisper-3" --convert_preprocessor True

The script will automatically determine all necessary parameters from the OpenAI checkpoint. A tiktoken library needs to be installed to perform the conversion of the OpenAI tokenizer to the tokenizers version.

Inference

Here is a step-by-step guide to transcribing an audio sample using a pre-trained Whisper model:

>>> from datasets import load_dataset
>>> from transformers import WhisperProcessor, WhisperForConditionalGeneration

>>> # Select an audio file and read it:
>>> ds = load_dataset("hf-internal-testing/librispeech_asr_dummy", "clean", split="validation")
>>> audio_sample = ds[0]["audio"]

>>> # Load the Whisper model in Hugging Face format:
>>> processor = WhisperProcessor.from_pretrained("openai/whisper-tiny.en")
>>> model = WhisperForConditionalGeneration.from_pretrained("openai/whisper-tiny.en")

>>> # Use the model and processor to transcribe the audio:
>>> input_features = processor(
...     audio_sample["array"], sampling_rate=audio_sample["sampling_rate"], return_tensors="pt"
... ).input_features

>>> # Generate token ids
>>> predicted_ids = model.generate(input_features)

>>> # Decode token ids to text
>>> transcription = processor.batch_decode(predicted_ids, skip_special_tokens=True)

>>> transcription[0]
' Mr. Quilter is the apostle of the middle classes, and we are glad to welcome his gospel.'

Whisper is compatible with the following optimisations for both short and long-form generation:

• PyTorch Scaled Dot Product Attention (SDPA): flash attention and memory-efficient attention kernels. Enabled by default for torch>=2.1.1.
• Flash Attention 2: improved implementation of flash attention through better parallelism and work partitioning.
• torch.compile: JIT-compile the forward pass to dispatch to efficient fused kernels.

As an example, the following codesnippet enables SDPA and torch.compile for up to 5x faster inference:

>>> from datasets import load_dataset
>>> from transformers import WhisperProcessor, WhisperForConditionalGeneration

>>> # Select an audio file and read it:
>>> ds = load_dataset("hf-internal-testing/librispeech_asr_dummy", "clean", split="validation")
>>> audio_sample = ds[0]["audio"]

>>> # Load the Whisper model with SDPA attention
>>> processor = WhisperProcessor.from_pretrained("openai/whisper-tiny.en")
>>> model = WhisperForConditionalGeneration.from_pretrained("openai/whisper-tiny.en", attn_implementation="sdpa")

>>> # Enable static cache and compile the forward pass
>>> model.generation_config.cache_implementation = "static"
>>> model.forward = torch.compile(model.forward, mode="reduce-overhead", fullgraph=True)

>>> # Use the model and processor to transcribe the audio:
>>> input_features = processor(
...     audio_sample["array"], sampling_rate=audio_sample["sampling_rate"], return_tensors="pt"
... ).input_features

>>> # Compile the forward pass
>>> for _ in range(2):
>>>     model.generate(input_features)

>>> # Generate token ids using compiled graph (fast!)
>>> predicted_ids = model.generate(input_features)

>>> # Decode token ids to text
>>> transcription = processor.batch_decode(predicted_ids, skip_special_tokens=True)

>>> transcription[0]
' Mr. Quilter is the apostle of the middle classes, and we are glad to welcome his gospel.'

For more details on each optimisation, refer to the documentation linked above.

Resources

A list of official Hugging Face and community (indicated by 🌎) resources to help you get started with Whisper. If you're interested in submitting a resource to be included here, please feel free to open a Pull Request and we'll review it! The resource should ideally demonstrate something new instead of duplicating an existing resource.

• Fine-tune Whisper on your own dataset for better downstream performance.
• Distil-Whisper: Upto 6x faster, 2x smaller distilled Whisper models for English. We release the model checkpoints, and distillation code.
• A fork with a script to convert a Whisper model in Hugging Face format to OpenAI format. 🌎 Usage example:

pip install -U openai-whisper
python convert_hf_to_openai.py \
    --checkpoint openai/whisper-tiny \
    --whisper_dump_path whisper-tiny-openai.pt

WhisperConfig

autodoc WhisperConfig

WhisperTokenizer

autodoc WhisperTokenizer - set_prefix_tokens - build_inputs_with_special_tokens - get_special_tokens_mask - create_token_type_ids_from_sequences - save_vocabulary - batch_decode - decode - basic_normalize - normalize

WhisperTokenizerFast

autodoc WhisperTokenizerFast - set_prefix_tokens - build_inputs_with_special_tokens - get_special_tokens_mask - create_token_type_ids_from_sequences - save_vocabulary - batch_decode - decode - basic_normalize - normalize

WhisperFeatureExtractor

autodoc WhisperFeatureExtractor - call

WhisperProcessor

autodoc WhisperProcessor - call - from_pretrained - save_pretrained - batch_decode - decode

WhisperModel

autodoc WhisperModel - forward - _mask_input_features

WhisperForConditionalGeneration

autodoc WhisperForConditionalGeneration - forward - generate

WhisperForCausalLM

autodoc WhisperForCausalLM - forward

WhisperForAudioClassification

autodoc WhisperForAudioClassification - forward

TFWhisperModel

autodoc TFWhisperModel - call

TFWhisperForConditionalGeneration

autodoc TFWhisperForConditionalGeneration - call

FlaxWhisperModel

autodoc FlaxWhisperModel - call

FlaxWhisperForConditionalGeneration

autodoc FlaxWhisperForConditionalGeneration - call

FlaxWhisperForAudioClassification

autodoc FlaxWhisperForAudioClassification - call