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Zipformer

Automatic Speech Recognition
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Zipformer: Optimized for Qualcomm Devices

Zipformer streaming ASR (Automatic Speech Recognition) model is a state-of-the-art system designed for transcribing spoken language into written text streamingly. This model is based on the transformer architecture and has been optimized for edge inference by replacing linear layers with convolutional (conv) layers. 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 audios. Time to the first token is the encoder's latency, while time to each additional token is joiner's latency, where we assume a max decoded length specified below.

This is based on the implementation of Zipformer found here. This repository contains pre-exported model files optimized for Qualcomm® devices. You can use the Qualcomm® AI Hub Models library to export with custom configurations. More details on model performance across various devices, can be found here.

Qualcomm AI Hub Models uses Qualcomm AI Hub Workbench to compile, profile, and evaluate this model. Sign up to run these models on a hosted Qualcomm® device.

Getting Started

There are two ways to deploy this model on your device:

Option 1: Download Pre-Exported Models

Below are pre-exported model assets ready for deployment.

Runtime Precision Chipset SDK Versions Download
PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite Gen 5 Mobile QAIRT 2.42, ONNX Runtime 1.24.3 Download
PRECOMPILED_QNN_ONNX float Snapdragon® X2 Elite QAIRT 2.42, ONNX Runtime 1.24.3 Download
PRECOMPILED_QNN_ONNX float Snapdragon® X Elite QAIRT 2.42, ONNX Runtime 1.24.3 Download
PRECOMPILED_QNN_ONNX float Snapdragon® 8 Gen 3 Mobile QAIRT 2.42, ONNX Runtime 1.24.3 Download
PRECOMPILED_QNN_ONNX float Qualcomm® QCS8550 (Proxy) QAIRT 2.42, ONNX Runtime 1.24.3 Download
PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite For Galaxy Mobile QAIRT 2.42, ONNX Runtime 1.24.3 Download
PRECOMPILED_QNN_ONNX float Qualcomm® QCS9075 QAIRT 2.42, ONNX Runtime 1.24.3 Download
QNN_CONTEXT_BINARY float Snapdragon® 8 Elite Gen 5 Mobile QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Snapdragon® X2 Elite QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Snapdragon® X Elite QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Snapdragon® 8 Gen 3 Mobile QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Qualcomm® QCS8550 (Proxy) QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Qualcomm® SA8775P QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Snapdragon® 8 Elite For Galaxy Mobile QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Qualcomm® SA7255P QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Qualcomm® SA8295P QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Qualcomm® QCS9075 QAIRT 2.45 Download
QNN_CONTEXT_BINARY float Qualcomm® QCS8450 (Proxy) QAIRT 2.45 Download

For more device-specific assets and performance metrics, visit Zipformer on Qualcomm® AI Hub.

Option 2: Export with Custom Configurations

Use the Qualcomm® AI Hub Models Python library to compile and export the model with your own:

  • Custom weights (e.g., fine-tuned checkpoints)
  • Custom input shapes
  • Target device and runtime configurations

This option is ideal if you need to customize the model beyond the default configuration provided here.

See our repository for Zipformer on GitHub for usage instructions.

Model Details

Model Type: Model_use_case.speech_recognition

Model Stats:

  • Model checkpoint: pfluo/k2fsa-zipformer-chinese-english-mixed
  • Input resolution: 80x71 (0.71 seconds audio)
  • Max decoded sequence length: 200 tokens
  • Number of parameters (encoder): 63.2M
  • Model size (encoder) (float): 242 MB
  • Number of parameters (decoder): 3.47M
  • Model size (decoder) (float): 13.2 MB
  • Number of parameters (joiner): 3.21M
  • Model size (joiner) (float): 12.2 MB

Performance Summary

Model Runtime Precision Chipset Inference Time (ms) Peak Memory Range (MB) Primary Compute Unit
decoder PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite Gen 5 Mobile 0.048 ms 0 - 10 MB NPU
decoder PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite Mobile 0.048 ms 0 - 11 MB NPU
decoder PRECOMPILED_QNN_ONNX float Snapdragon® X2 Elite 0.038 ms 7 - 7 MB NPU
decoder PRECOMPILED_QNN_ONNX float Snapdragon® X Elite 0.152 ms 7 - 7 MB NPU
decoder PRECOMPILED_QNN_ONNX float Snapdragon® X Elite 0.152 ms 7 - 7 MB NPU
decoder PRECOMPILED_QNN_ONNX float Snapdragon® 8 Gen 3 Mobile 0.057 ms 0 - 6 MB NPU
decoder PRECOMPILED_QNN_ONNX float Qualcomm® QCS8550 (Proxy) 0.075 ms 0 - 8 MB NPU
decoder PRECOMPILED_QNN_ONNX float Qualcomm® QCS9075 0.154 ms 0 - 3 MB NPU
decoder PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite For Galaxy Mobile 0.048 ms 0 - 11 MB NPU
decoder PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Elite Gen 5 Mobile 0.054 ms 0 - 10 MB NPU
decoder PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Elite Mobile 0.052 ms 0 - 7 MB NPU
decoder PRECOMPILED_QNN_ONNX mixed Snapdragon® X2 Elite 0.034 ms 7 - 7 MB NPU
decoder PRECOMPILED_QNN_ONNX mixed Snapdragon® X Elite 0.156 ms 7 - 7 MB NPU
decoder PRECOMPILED_QNN_ONNX mixed Snapdragon® X Elite 0.156 ms 7 - 7 MB NPU
decoder PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Gen 3 Mobile 0.061 ms 0 - 6 MB NPU
decoder PRECOMPILED_QNN_ONNX mixed Qualcomm® QCS8550 (Proxy) 0.073 ms 0 - 8 MB NPU
decoder PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Elite For Galaxy Mobile 0.052 ms 0 - 7 MB NPU
decoder PRECOMPILED_QNN_ONNX mixed Qualcomm® QCS9075 0.151 ms 0 - 3 MB NPU
decoder QNN_CONTEXT_BINARY float Snapdragon® 8 Elite Gen 5 Mobile 0.041 ms 0 - 9 MB NPU
decoder QNN_CONTEXT_BINARY float Snapdragon® 8 Elite Mobile 0.041 ms 0 - 9 MB NPU
decoder QNN_CONTEXT_BINARY float Snapdragon® X2 Elite 0.132 ms 0 - 0 MB NPU
decoder QNN_CONTEXT_BINARY float Snapdragon® X Elite 0.147 ms 0 - 0 MB NPU
decoder QNN_CONTEXT_BINARY float Snapdragon® X Elite 0.147 ms 0 - 0 MB NPU
decoder QNN_CONTEXT_BINARY float Snapdragon® 8 Gen 3 Mobile 0.061 ms 0 - 7 MB NPU
decoder QNN_CONTEXT_BINARY float Qualcomm® QCS8550 (Proxy) 0.075 ms 0 - 1 MB NPU
decoder QNN_CONTEXT_BINARY float Qualcomm® SA8775P 0.212 ms 0 - 9 MB NPU
decoder QNN_CONTEXT_BINARY float Qualcomm® SA8775P 0.212 ms 0 - 9 MB NPU
decoder QNN_CONTEXT_BINARY float Qualcomm® SA8775P 0.212 ms 0 - 9 MB NPU
decoder QNN_CONTEXT_BINARY float Qualcomm® SA8295P 0.326 ms 0 - 5 MB NPU
decoder QNN_CONTEXT_BINARY float Qualcomm® QCS9075 0.124 ms 0 - 2 MB NPU
decoder QNN_CONTEXT_BINARY float Snapdragon® 8 Elite For Galaxy Mobile 0.041 ms 0 - 9 MB NPU
decoder QNN_CONTEXT_BINARY float Qualcomm® QCS8450 (Proxy) 0.097 ms 0 - 9 MB NPU
decoder QNN_CONTEXT_BINARY float Qualcomm® SA7255P 0.303 ms 0 - 8 MB NPU
encoder PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite Gen 5 Mobile 4.821 ms 10 - 20 MB NPU
encoder PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite Mobile 5.459 ms 10 - 21 MB NPU
encoder PRECOMPILED_QNN_ONNX float Snapdragon® X2 Elite 5.345 ms 142 - 142 MB NPU
encoder PRECOMPILED_QNN_ONNX float Snapdragon® X Elite 9.829 ms 142 - 142 MB NPU
encoder PRECOMPILED_QNN_ONNX float Snapdragon® X Elite 9.829 ms 142 - 142 MB NPU
encoder PRECOMPILED_QNN_ONNX float Snapdragon® 8 Gen 3 Mobile 6.565 ms 9 - 17 MB NPU
encoder PRECOMPILED_QNN_ONNX float Qualcomm® QCS8550 (Proxy) 9.122 ms 0 - 159 MB NPU
encoder PRECOMPILED_QNN_ONNX float Qualcomm® QCS9075 10.452 ms 8 - 12 MB NPU
encoder PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite For Galaxy Mobile 5.459 ms 10 - 21 MB NPU
encoder PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Elite Gen 5 Mobile 7.148 ms 10 - 20 MB NPU
encoder PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Elite Mobile 7.53 ms 9 - 16 MB NPU
encoder PRECOMPILED_QNN_ONNX mixed Snapdragon® X2 Elite 8.433 ms 75 - 75 MB NPU
encoder PRECOMPILED_QNN_ONNX mixed Snapdragon® X Elite 13.447 ms 75 - 75 MB NPU
encoder PRECOMPILED_QNN_ONNX mixed Snapdragon® X Elite 13.447 ms 75 - 75 MB NPU
encoder PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Gen 3 Mobile 11.413 ms 9 - 17 MB NPU
encoder PRECOMPILED_QNN_ONNX mixed Qualcomm® QCS8550 (Proxy) 15.855 ms 9 - 10 MB NPU
encoder PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Elite For Galaxy Mobile 7.53 ms 9 - 16 MB NPU
encoder PRECOMPILED_QNN_ONNX mixed Qualcomm® QCS9075 16.676 ms 8 - 12 MB NPU
encoder QNN_CONTEXT_BINARY float Snapdragon® 8 Elite Gen 5 Mobile 4.793 ms 3 - 13 MB NPU
encoder QNN_CONTEXT_BINARY float Snapdragon® 8 Elite Mobile 5.463 ms 3 - 15 MB NPU
encoder QNN_CONTEXT_BINARY float Snapdragon® X2 Elite 6.04 ms 3 - 3 MB NPU
encoder QNN_CONTEXT_BINARY float Snapdragon® X Elite 9.514 ms 3 - 3 MB NPU
encoder QNN_CONTEXT_BINARY float Snapdragon® X Elite 9.514 ms 3 - 3 MB NPU
encoder QNN_CONTEXT_BINARY float Snapdragon® 8 Gen 3 Mobile 6.61 ms 2 - 11 MB NPU
encoder QNN_CONTEXT_BINARY float Qualcomm® QCS8550 (Proxy) 9.048 ms 3 - 5 MB NPU
encoder QNN_CONTEXT_BINARY float Qualcomm® SA8775P 10.629 ms 3 - 11 MB NPU
encoder QNN_CONTEXT_BINARY float Qualcomm® SA8775P 10.629 ms 3 - 11 MB NPU
encoder QNN_CONTEXT_BINARY float Qualcomm® SA8775P 10.629 ms 3 - 11 MB NPU
encoder QNN_CONTEXT_BINARY float Qualcomm® SA8295P 13.065 ms 1 - 6 MB NPU
encoder QNN_CONTEXT_BINARY float Qualcomm® QCS9075 10.093 ms 3 - 7 MB NPU
encoder QNN_CONTEXT_BINARY float Snapdragon® 8 Elite For Galaxy Mobile 5.463 ms 3 - 15 MB NPU
encoder QNN_CONTEXT_BINARY float Qualcomm® QCS8450 (Proxy) 12.087 ms 2 - 13 MB NPU
encoder QNN_CONTEXT_BINARY float Qualcomm® SA7255P 23.479 ms 3 - 11 MB NPU
joiner PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite Gen 5 Mobile 0.132 ms 0 - 10 MB NPU
joiner PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite Mobile 0.133 ms 0 - 7 MB NPU
joiner PRECOMPILED_QNN_ONNX float Snapdragon® X2 Elite 0.089 ms 6 - 6 MB NPU
joiner PRECOMPILED_QNN_ONNX float Snapdragon® X Elite 0.252 ms 6 - 6 MB NPU
joiner PRECOMPILED_QNN_ONNX float Snapdragon® X Elite 0.252 ms 6 - 6 MB NPU
joiner PRECOMPILED_QNN_ONNX float Snapdragon® 8 Gen 3 Mobile 0.156 ms 0 - 7 MB NPU
joiner PRECOMPILED_QNN_ONNX float Qualcomm® QCS8550 (Proxy) 0.192 ms 0 - 9 MB NPU
joiner PRECOMPILED_QNN_ONNX float Qualcomm® QCS9075 0.271 ms 0 - 3 MB NPU
joiner PRECOMPILED_QNN_ONNX float Snapdragon® 8 Elite For Galaxy Mobile 0.133 ms 0 - 7 MB NPU
joiner PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Elite Gen 5 Mobile 0.136 ms 0 - 10 MB NPU
joiner PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Elite Mobile 0.138 ms 0 - 7 MB NPU
joiner PRECOMPILED_QNN_ONNX mixed Snapdragon® X2 Elite 0.087 ms 6 - 6 MB NPU
joiner PRECOMPILED_QNN_ONNX mixed Snapdragon® X Elite 0.268 ms 6 - 6 MB NPU
joiner PRECOMPILED_QNN_ONNX mixed Snapdragon® X Elite 0.268 ms 6 - 6 MB NPU
joiner PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Gen 3 Mobile 0.161 ms 0 - 6 MB NPU
joiner PRECOMPILED_QNN_ONNX mixed Qualcomm® QCS8550 (Proxy) 0.206 ms 0 - 8 MB NPU
joiner PRECOMPILED_QNN_ONNX mixed Snapdragon® 8 Elite For Galaxy Mobile 0.138 ms 0 - 7 MB NPU
joiner PRECOMPILED_QNN_ONNX mixed Qualcomm® QCS9075 0.277 ms 0 - 3 MB NPU
joiner QNN_CONTEXT_BINARY float Snapdragon® 8 Elite Gen 5 Mobile 0.131 ms 0 - 10 MB NPU
joiner QNN_CONTEXT_BINARY float Snapdragon® 8 Elite Mobile 0.146 ms 0 - 13 MB NPU
joiner QNN_CONTEXT_BINARY float Snapdragon® X2 Elite 0.177 ms 0 - 0 MB NPU
joiner QNN_CONTEXT_BINARY float Snapdragon® X Elite 0.254 ms 0 - 0 MB NPU
joiner QNN_CONTEXT_BINARY float Snapdragon® X Elite 0.254 ms 0 - 0 MB NPU
joiner QNN_CONTEXT_BINARY float Snapdragon® 8 Gen 3 Mobile 0.164 ms 0 - 7 MB NPU
joiner QNN_CONTEXT_BINARY float Qualcomm® QCS8550 (Proxy) 0.185 ms 0 - 1 MB NPU
joiner QNN_CONTEXT_BINARY float Qualcomm® SA8775P 0.322 ms 0 - 10 MB NPU
joiner QNN_CONTEXT_BINARY float Qualcomm® SA8775P 0.322 ms 0 - 10 MB NPU
joiner QNN_CONTEXT_BINARY float Qualcomm® SA8775P 0.322 ms 0 - 10 MB NPU
joiner QNN_CONTEXT_BINARY float Qualcomm® SA8295P 0.452 ms 0 - 5 MB NPU
joiner QNN_CONTEXT_BINARY float Qualcomm® QCS9075 0.235 ms 2 - 4 MB NPU
joiner QNN_CONTEXT_BINARY float Snapdragon® 8 Elite For Galaxy Mobile 0.146 ms 0 - 13 MB NPU
joiner QNN_CONTEXT_BINARY float Qualcomm® QCS8450 (Proxy) 0.229 ms 0 - 9 MB NPU
joiner QNN_CONTEXT_BINARY float Qualcomm® SA7255P 0.482 ms 0 - 9 MB NPU

License

  • The license for the original implementation of Zipformer can be found here.

References

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