yolov5s_android:rocket:

The implementation of yolov5s on android for the yolov5s export contest.
Download the latest android apk from release and install your device.

UPDATE:rocket: 2022/06/25 Added tutorial on how to integrate models trained with custom data. Custom Model Intergration Tutorial

Environment

• Host Ubuntu18.04
• Docker
  • Tensorflow 2.4.0
  • PyTorch 1.7.0
  • OpenVino 2021.3
• Android App
  • Android Studio 4.2.1
  • minSdkVersion 28
  • targetSdkVersion 29
  • TfLite 2.4.0
• Android Device
  • Xiaomi Mi11 (Storage 128GB/ RAM8GB)
  • OS MIUI 12.5.8

We use docker container for host evaluation and model conversion.

git clone --recursive https://github.com/lp6m/yolov5s_android
cd yolov5s_android
docker build ./ -f ./docker/Dockerfile  -t yolov5s_android
docker run -it --gpus all -v `pwd`:/workspace yolov5s_android bash

Files

• ./app
  • Android application.
  • To build application by yourself, copy ./tflite_model/*.tflite to app/tflite_yolov5_test/app/src/main/assets/, and build on Android Studio.
  • The app can perform inference with various configurations of input size, inference accuracy, and model accuracy.
  • For 'Open Directory Mode', save the detected bounding boxes results as a json file in coco format.
  • Realtime deteciton from camera image (precision and input size is fixed to int8/320). Achieved FPS is about 15FPS on Mi11.
  • NOTE Please select image/directory as an absolute path from 'Device'. The app does not support select image/directory from 'Recent' in some devices.
• ./benchmark
  • Benchmark script and results by TFLite Model Benchmark Tool with C++ Binary.
• ./convert_model
  • Model conversion guide and model quantization script.
• ./docker
  • Dockerfile for the evaluation and model conversion environment.
• ./host
  • detect.py : Run detection for image with TfLite model on host environment.
  • evaluate.py: Run evaluation with coco validation dataset and inference results.
• ./tflite_model
  • Converted TfLite Model.

Performance

Latency

These results are measured on Xiaomi Mi11.
Please refer benchmark/README.md about the detail of benchmark command.
The latency does not contain the pre/post processing time and data transfer time.

float32 model

delegate	640x640 [ms]	320x320 [ms]
None (CPU)	249	61
NNAPI (qti-gpu, fp32)	156	112
NNAPI (qti-gpu, fp16)	92	79

int8 model

We tried to accelerate the inference process by using NNAPI (qti-dsp) and offload calculation to Hexagon DSP, but it doesn't work for now. Please see here in detail.

delegate	640x640 [ms]	320x320 [ms]
None (CPU)	95	23
NNAPI (qti-default)	Not working	Not working
NNAPI (qti-dsp)	Not working	Not working

Accuracy

Please refer host/README.md about the evaluation method.
We set conf_thresh=0.25 and iou_thresh=0.45 for nms parameter.

device, model, delegate	640x640 mAP	320x320 mAP
host GPU (Tflite + PyTorch, fp32)	27.8	26.6
host CPU (Tflite + PyTorch, int8)	26.6	25.5
NNAPI (qti-gpu, fp16)	28.5	26.8
CPU (int8)	27.2	25.8

Model conversion

This project focuses on obtaining a tflite model by model conversion from PyTorch original implementation, rather than doing own implementation in tflite.
We convert models in this way: PyTorch -> ONNX -> OpenVino -> TfLite.
To convert the model from OpenVino to TfLite, we use openvino2tensorflow. Please refer convert_model/README.md about the model conversion.