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Whisper-Small-En

Automatic Speech Recognition
PyTorch
TF Lite
ONNX
foundation
android
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Whisper-Small-En: Optimized for Mobile Deployment

Automatic speech recognition (ASR) model for English transcription as well as translation

OpenAI’s Whisper ASR (Automatic Speech Recognition) model is a state-of-the-art system designed for transcribing spoken language into written text. It exhibits robust performance in realistic, noisy environments, making it highly reliable for real-world applications. Specifically, it excels in long-form transcription, capable of accurately transcribing audio clips up to 30 seconds long. Time to the first token is the encoder's latency, while time to each additional token is decoder's latency, where we assume a mean decoded length specified below.

This model is an implementation of Whisper-Small-En found here.

This repository provides scripts to run Whisper-Small-En on Qualcomm® devices. More details on model performance across various devices, can be found here.

Model Details

  • Model Type: Speech recognition
  • Model Stats:
    • Model checkpoint: small.en
    • Input resolution: 80x3000 (30 seconds audio)
    • Mean decoded sequence length: 112 tokens
    • Number of parameters (WhisperEncoder): 102M
    • Model size (WhisperEncoder): 390 MB
    • Number of parameters (WhisperDecoder): 139M
    • Model size (WhisperDecoder): 531 MB
Model Device Chipset Target Runtime Inference Time (ms) Peak Memory Range (MB) Precision Primary Compute Unit Target Model
WhisperEncoder Samsung Galaxy S23 Snapdragon® 8 Gen 2 TFLITE 704.009 ms 45 - 439 MB FP16 GPU Whisper-Small-En.tflite
WhisperEncoder Samsung Galaxy S23 Snapdragon® 8 Gen 2 QNN 866.62 ms 2 - 230 MB FP16 NPU Whisper-Small-En.so
WhisperEncoder Samsung Galaxy S24 Snapdragon® 8 Gen 3 TFLITE 514.369 ms 108 - 196 MB FP16 GPU Whisper-Small-En.tflite
WhisperEncoder Samsung Galaxy S24 Snapdragon® 8 Gen 3 QNN 615.589 ms 0 - 839 MB FP16 NPU Whisper-Small-En.so
WhisperEncoder Samsung Galaxy S24 Snapdragon® 8 Gen 3 ONNX 808.662 ms 145 - 4336 MB FP16 NPU Whisper-Small-En.onnx
WhisperEncoder Snapdragon 8 Elite QRD Snapdragon® 8 Elite TFLITE 537.047 ms 111 - 139 MB FP16 GPU Whisper-Small-En.tflite
WhisperEncoder Snapdragon 8 Elite QRD Snapdragon® 8 Elite QNN 494.644 ms 0 - 908 MB FP16 NPU Use Export Script
WhisperEncoder Snapdragon 8 Elite QRD Snapdragon® 8 Elite ONNX 698.505 ms 117 - 2773 MB FP16 NPU Whisper-Small-En.onnx
WhisperEncoder QCS8550 (Proxy) QCS8550 Proxy TFLITE 686.962 ms 40 - 440 MB FP16 GPU Whisper-Small-En.tflite
WhisperEncoder QCS8550 (Proxy) QCS8550 Proxy QNN 693.295 ms 1 - 2 MB FP16 NPU Use Export Script
WhisperEncoder SA8255 (Proxy) SA8255P Proxy TFLITE 711.433 ms 18 - 355 MB FP16 GPU Whisper-Small-En.tflite
WhisperEncoder SA8255 (Proxy) SA8255P Proxy QNN 701.7 ms 1 - 2 MB FP16 NPU Use Export Script
WhisperEncoder SA8775 (Proxy) SA8775P Proxy TFLITE 703.544 ms 61 - 457 MB FP16 GPU Whisper-Small-En.tflite
WhisperEncoder SA8775 (Proxy) SA8775P Proxy QNN 713.618 ms 0 - 57 MB FP16 NPU Use Export Script
WhisperEncoder SA8650 (Proxy) SA8650P Proxy TFLITE 712.376 ms 33 - 421 MB FP16 GPU Whisper-Small-En.tflite
WhisperEncoder SA8650 (Proxy) SA8650P Proxy QNN 724.601 ms 1 - 30 MB FP16 NPU Use Export Script
WhisperEncoder SA8295P ADP SA8295P TFLITE 658.817 ms 108 - 140 MB FP16 GPU Whisper-Small-En.tflite
WhisperEncoder SA8295P ADP SA8295P QNN 727.239 ms 3 - 8 MB FP16 NPU Use Export Script
WhisperEncoder QCS8450 (Proxy) QCS8450 Proxy TFLITE 972.067 ms 75 - 170 MB FP16 GPU Whisper-Small-En.tflite
WhisperEncoder Snapdragon X Elite CRD Snapdragon® X Elite QNN 526.155 ms 0 - 0 MB FP16 NPU Use Export Script
WhisperEncoder Snapdragon X Elite CRD Snapdragon® X Elite ONNX 1356.64 ms 449 - 449 MB FP16 NPU Whisper-Small-En.onnx
WhisperDecoder Samsung Galaxy S23 Snapdragon® 8 Gen 2 TFLITE 25.328 ms 16 - 19 MB FP16 NPU Whisper-Small-En.tflite
WhisperDecoder Samsung Galaxy S23 Snapdragon® 8 Gen 2 QNN 12.008 ms 61 - 130 MB FP16 NPU Whisper-Small-En.so
WhisperDecoder Samsung Galaxy S23 Snapdragon® 8 Gen 2 ONNX 57.142 ms 121 - 124 MB FP16 NPU Whisper-Small-En.onnx
WhisperDecoder Samsung Galaxy S24 Snapdragon® 8 Gen 3 TFLITE 19.228 ms 32 - 1144 MB FP16 NPU Whisper-Small-En.tflite
WhisperDecoder Samsung Galaxy S24 Snapdragon® 8 Gen 3 QNN 9.452 ms 59 - 158 MB FP16 NPU Whisper-Small-En.so
WhisperDecoder Snapdragon 8 Elite QRD Snapdragon® 8 Elite TFLITE 16.628 ms 16 - 263 MB FP16 NPU Whisper-Small-En.tflite
WhisperDecoder Snapdragon 8 Elite QRD Snapdragon® 8 Elite QNN 7.482 ms 50 - 183 MB FP16 NPU Use Export Script
WhisperDecoder Snapdragon 8 Elite QRD Snapdragon® 8 Elite ONNX 39.601 ms 111 - 883 MB FP16 NPU Whisper-Small-En.onnx
WhisperDecoder QCS8550 (Proxy) QCS8550 Proxy TFLITE 25.84 ms 16 - 18 MB FP16 NPU Whisper-Small-En.tflite
WhisperDecoder QCS8550 (Proxy) QCS8550 Proxy QNN 12.335 ms 57 - 58 MB FP16 NPU Use Export Script
WhisperDecoder SA8255 (Proxy) SA8255P Proxy TFLITE 25.356 ms 15 - 18 MB FP16 NPU Whisper-Small-En.tflite
WhisperDecoder SA8255 (Proxy) SA8255P Proxy QNN 12.62 ms 64 - 65 MB FP16 NPU Use Export Script
WhisperDecoder SA8775 (Proxy) SA8775P Proxy TFLITE 25.355 ms 14 - 18 MB FP16 NPU Whisper-Small-En.tflite
WhisperDecoder SA8775 (Proxy) SA8775P Proxy QNN 12.69 ms 65 - 66 MB FP16 NPU Use Export Script
WhisperDecoder SA8650 (Proxy) SA8650P Proxy TFLITE 24.58 ms 15 - 18 MB FP16 NPU Whisper-Small-En.tflite
WhisperDecoder SA8650 (Proxy) SA8650P Proxy QNN 12.971 ms 61 - 62 MB FP16 NPU Use Export Script
WhisperDecoder SA8295P ADP SA8295P TFLITE 27.039 ms 16 - 243 MB FP16 NPU Whisper-Small-En.tflite
WhisperDecoder SA8295P ADP SA8295P QNN 14.311 ms 57 - 62 MB FP16 NPU Use Export Script
WhisperDecoder QCS8450 (Proxy) QCS8450 Proxy TFLITE 28.297 ms 16 - 1104 MB FP16 NPU Whisper-Small-En.tflite
WhisperDecoder QCS8450 (Proxy) QCS8450 Proxy QNN 15.403 ms 57 - 156 MB FP16 NPU Use Export Script
WhisperDecoder Snapdragon X Elite CRD Snapdragon® X Elite QNN 10.907 ms 61 - 61 MB FP16 NPU Use Export Script
WhisperDecoder Snapdragon X Elite CRD Snapdragon® X Elite ONNX 49.551 ms 232 - 232 MB FP16 NPU Whisper-Small-En.onnx

Installation

This model can be installed as a Python package via pip.

pip install "qai-hub-models[whisper_small_en]"

Configure Qualcomm® AI Hub to run this model on a cloud-hosted device

Sign-in to Qualcomm® AI Hub with your Qualcomm® ID. Once signed in navigate to Account -> Settings -> API Token.

With this API token, you can configure your client to run models on the cloud hosted devices.

qai-hub configure --api_token API_TOKEN

Navigate to docs for more information.

Demo off target

The package contains a simple end-to-end demo that downloads pre-trained weights and runs this model on a sample input.

python -m qai_hub_models.models.whisper_small_en.demo

The above demo runs a reference implementation of pre-processing, model inference, and post processing.

NOTE: If you want running in a Jupyter Notebook or Google Colab like environment, please add the following to your cell (instead of the above).

%run -m qai_hub_models.models.whisper_small_en.demo

Run model on a cloud-hosted device

In addition to the demo, you can also run the model on a cloud-hosted Qualcomm® device. This script does the following:

  • Performance check on-device on a cloud-hosted device
  • Downloads compiled assets that can be deployed on-device for Android.
  • Accuracy check between PyTorch and on-device outputs.
python -m qai_hub_models.models.whisper_small_en.export

Profiling Results
------------------------------------------------------------
WhisperEncoder
Device                          : Samsung Galaxy S23 (13)   
Runtime                         : TFLITE                    
Estimated inference time (ms)   : 704.0                     
Estimated peak memory usage (MB): [45, 439]                 
Total # Ops                     : 911                       
Compute Unit(s)                 : GPU (900 ops) CPU (11 ops)

------------------------------------------------------------
WhisperDecoder
Device                          : Samsung Galaxy S23 (13)
Runtime                         : TFLITE                 
Estimated inference time (ms)   : 25.3                   
Estimated peak memory usage (MB): [16, 19]               
Total # Ops                     : 2573                   
Compute Unit(s)                 : NPU (2573 ops)

How does this work?

This export script leverages Qualcomm® AI Hub to optimize, validate, and deploy this model on-device. Lets go through each step below in detail:

Step 1: Compile model for on-device deployment

To compile a PyTorch model for on-device deployment, we first trace the model in memory using the jit.trace and then call the submit_compile_job API.

import torch

import qai_hub as hub
from qai_hub_models.models.whisper_small_en import WhisperEncoder,WhisperDecoder

# Load the model
encoder_model = WhisperEncoder.from_pretrained()
decoder_model = WhisperDecoder.from_pretrained()

# Device
device = hub.Device("Samsung Galaxy S23")

# Trace model
encoder_input_shape = encoder_model.get_input_spec()
encoder_sample_inputs = encoder_model.sample_inputs()

traced_encoder_model = torch.jit.trace(encoder_model, [torch.tensor(data[0]) for _, data in encoder_sample_inputs.items()])

# Compile model on a specific device
encoder_compile_job = hub.submit_compile_job(
    model=traced_encoder_model ,
    device=device,
    input_specs=encoder_model.get_input_spec(),
)

# Get target model to run on-device
encoder_target_model = encoder_compile_job.get_target_model()
# Trace model
decoder_input_shape = decoder_model.get_input_spec()
decoder_sample_inputs = decoder_model.sample_inputs()

traced_decoder_model = torch.jit.trace(decoder_model, [torch.tensor(data[0]) for _, data in decoder_sample_inputs.items()])

# Compile model on a specific device
decoder_compile_job = hub.submit_compile_job(
    model=traced_decoder_model ,
    device=device,
    input_specs=decoder_model.get_input_spec(),
)

# Get target model to run on-device
decoder_target_model = decoder_compile_job.get_target_model()

Step 2: Performance profiling on cloud-hosted device

After compiling models from step 1. Models can be profiled model on-device using the target_model. Note that this scripts runs the model on a device automatically provisioned in the cloud. Once the job is submitted, you can navigate to a provided job URL to view a variety of on-device performance metrics.

encoder_profile_job = hub.submit_profile_job(
    model=encoder_target_model,
    device=device,
)
decoder_profile_job = hub.submit_profile_job(
    model=decoder_target_model,
    device=device,
)

Step 3: Verify on-device accuracy

To verify the accuracy of the model on-device, you can run on-device inference on sample input data on the same cloud hosted device.

encoder_input_data = encoder_model.sample_inputs()
encoder_inference_job = hub.submit_inference_job(
    model=encoder_target_model,
    device=device,
    inputs=encoder_input_data,
)
encoder_inference_job.download_output_data()
decoder_input_data = decoder_model.sample_inputs()
decoder_inference_job = hub.submit_inference_job(
    model=decoder_target_model,
    device=device,
    inputs=decoder_input_data,
)
decoder_inference_job.download_output_data()

With the output of the model, you can compute like PSNR, relative errors or spot check the output with expected output.

Note: This on-device profiling and inference requires access to Qualcomm® AI Hub. Sign up for access.

Deploying compiled model to Android

The models can be deployed using multiple runtimes:

  • TensorFlow Lite (.tflite export): This tutorial provides a guide to deploy the .tflite model in an Android application.

  • QNN (.so export ): This sample app provides instructions on how to use the .so shared library in an Android application.

View on Qualcomm® AI Hub

Get more details on Whisper-Small-En's performance across various devices here. Explore all available models on Qualcomm® AI Hub

License

  • The license for the original implementation of Whisper-Small-En can be found here.
  • The license for the compiled assets for on-device deployment can be found here

References

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