Yolo-v3: Optimized for Mobile Deployment

Real-time object detection optimized for mobile and edge

YoloV3 is a machine learning model that predicts bounding boxes and classes of objects in an image.

This model is an implementation of Yolo-v3 found here.

This repository provides scripts to run Yolo-v3 on Qualcomm® devices. More details on model performance across various devices, can be found here.

Model Details

• Model Type: Object detection
• Model Stats:
  • Model checkpoint: YoloV3 Tiny
  • Input resolution: 416p (416x416)
  • Number of parameters: 8.85M
  • Model size: 24.4 MB

Model	Device	Chipset	Target Runtime	Inference Time (ms)	Peak Memory Range (MB)	Precision	Primary Compute Unit	Target Model
Yolo-v3	Samsung Galaxy S23	Snapdragon® 8 Gen 2	TFLITE	24.935 ms	0 - 17 MB	FP16	NPU	Yolo-v3.tflite
Yolo-v3	Samsung Galaxy S23	Snapdragon® 8 Gen 2	QNN	10.405 ms	5 - 21 MB	FP16	NPU	Yolo-v3.so
Yolo-v3	Samsung Galaxy S23	Snapdragon® 8 Gen 2	ONNX	14.65 ms	10 - 23 MB	FP16	NPU	Yolo-v3.onnx
Yolo-v3	Samsung Galaxy S24	Snapdragon® 8 Gen 3	TFLITE	17.648 ms	0 - 79 MB	FP16	NPU	Yolo-v3.tflite
Yolo-v3	Samsung Galaxy S24	Snapdragon® 8 Gen 3	QNN	7.427 ms	5 - 38 MB	FP16	NPU	Yolo-v3.so
Yolo-v3	Samsung Galaxy S24	Snapdragon® 8 Gen 3	ONNX	11.103 ms	0 - 62 MB	FP16	NPU	Yolo-v3.onnx
Yolo-v3	Snapdragon 8 Elite QRD	Snapdragon® 8 Elite	TFLITE	15.003 ms	0 - 76 MB	FP16	NPU	Yolo-v3.tflite
Yolo-v3	Snapdragon 8 Elite QRD	Snapdragon® 8 Elite	QNN	7.731 ms	5 - 33 MB	FP16	NPU	Use Export Script
Yolo-v3	Snapdragon 8 Elite QRD	Snapdragon® 8 Elite	ONNX	11.942 ms	3 - 42 MB	FP16	NPU	Yolo-v3.onnx
Yolo-v3	QCS8550 (Proxy)	QCS8550 Proxy	TFLITE	24.289 ms	0 - 15 MB	FP16	NPU	Yolo-v3.tflite
Yolo-v3	QCS8550 (Proxy)	QCS8550 Proxy	QNN	9.55 ms	5 - 6 MB	FP16	NPU	Use Export Script
Yolo-v3	QCS8450 (Proxy)	QCS8450 Proxy	TFLITE	27.309 ms	0 - 73 MB	FP16	NPU	Yolo-v3.tflite
Yolo-v3	QCS8450 (Proxy)	QCS8450 Proxy	QNN	12.115 ms	5 - 34 MB	FP16	NPU	Use Export Script
Yolo-v3	Snapdragon X Elite CRD	Snapdragon® X Elite	QNN	9.718 ms	5 - 5 MB	FP16	NPU	Use Export Script
Yolo-v3	Snapdragon X Elite CRD	Snapdragon® X Elite	ONNX	15.732 ms	5 - 5 MB	FP16	NPU	Yolo-v3.onnx

Installation

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

pip install "qai-hub-models[yolov3]"

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.yolov3.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.yolov3.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.yolov3.export

Profiling Results
------------------------------------------------------------
Yolo-v3
Device                          : Samsung Galaxy S23 (13)
Runtime                         : TFLITE                 
Estimated inference time (ms)   : 24.9                   
Estimated peak memory usage (MB): [0, 17]                
Total # Ops                     : 163                    
Compute Unit(s)                 : NPU (163 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.yolov3 import Model

# Load the model
torch_model = Model.from_pretrained()

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

# Trace model
input_shape = torch_model.get_input_spec()
sample_inputs = torch_model.sample_inputs()

pt_model = torch.jit.trace(torch_model, [torch.tensor(data[0]) for _, data in sample_inputs.items()])

# Compile model on a specific device
compile_job = hub.submit_compile_job(
    model=pt_model,
    device=device,
    input_specs=torch_model.get_input_spec(),
)

# Get target model to run on-device
target_model = 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.

profile_job = hub.submit_profile_job(
    model=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.

input_data = torch_model.sample_inputs()
inference_job = hub.submit_inference_job(
    model=target_model,
    device=device,
    inputs=input_data,
)
    on_device_output = 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.

Run demo on a cloud-hosted device

You can also run the demo on-device.

python -m qai_hub_models.models.yolov3.demo --on-device

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.yolov3.demo -- --on-device

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 Yolo-v3's performance across various devices here. Explore all available models on Qualcomm® AI Hub

License

• The license for the original implementation of Yolo-v3 can be found here.
• The license for the compiled assets for on-device deployment can be found here

References

• YOLOv3: An Incremental Improvement
• Source Model Implementation

Community

• Join our AI Hub Slack community to collaborate, post questions and learn more about on-device AI.
• For questions or feedback please reach out to us.