YOLOv5 v6.0 compatibility update (#1857)
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# Flask REST API
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[REST](https://en.wikipedia.org/wiki/Representational_state_transfer) [API](https://en.wikipedia.org/wiki/API)s are commonly used to expose Machine Learning (ML) models to other services. This folder contains an example REST API created using Flask to expose the YOLOv5s model from [PyTorch Hub](https://pytorch.org/hub/ultralytics_yolov5/).
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## Requirements
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[Flask](https://palletsprojects.com/p/flask/) is required. Install with:
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```shell
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$ pip install Flask
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```
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## Run
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After Flask installation run:
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```shell
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$ python3 restapi.py --port 5000
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```
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Then use [curl](https://curl.se/) to perform a request:
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```shell
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$ curl -X POST -F image=@zidane.jpg 'http://localhost:5000/v1/object-detection/yolov5s'`
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```
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The model inference results are returned as a JSON response:
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```json
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[
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{
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"class": 0,
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"confidence": 0.8900438547,
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"height": 0.9318675399,
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"name": "person",
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"width": 0.3264600933,
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"xcenter": 0.7438579798,
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"ycenter": 0.5207948685
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},
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{
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"class": 0,
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"confidence": 0.8440024257,
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"height": 0.7155083418,
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"name": "person",
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"width": 0.6546785235,
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"xcenter": 0.427829951,
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"ycenter": 0.6334488392
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},
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{
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"class": 27,
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"confidence": 0.3771208823,
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"height": 0.3902671337,
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"name": "tie",
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"width": 0.0696444362,
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"xcenter": 0.3675483763,
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"ycenter": 0.7991207838
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},
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{
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"class": 27,
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"confidence": 0.3527112305,
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"height": 0.1540903747,
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"name": "tie",
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"width": 0.0336618312,
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"xcenter": 0.7814827561,
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"ycenter": 0.5065554976
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}
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]
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```
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An example python script to perform inference using [requests](https://docs.python-requests.org/en/master/) is given in `example_request.py`
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"""Perform test request"""
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import pprint
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import requests
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DETECTION_URL = "http://localhost:5000/v1/object-detection/yolov5s"
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TEST_IMAGE = "zidane.jpg"
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image_data = open(TEST_IMAGE, "rb").read()
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response = requests.post(DETECTION_URL, files={"image": image_data}).json()
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pprint.pprint(response)
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"""
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Run a rest API exposing the yolov5s object detection model
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"""
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import argparse
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import io
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import torch
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from PIL import Image
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from flask import Flask, request
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app = Flask(__name__)
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DETECTION_URL = "/v1/object-detection/yolov5s"
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@app.route(DETECTION_URL, methods=["POST"])
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def predict():
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if not request.method == "POST":
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return
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if request.files.get("image"):
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image_file = request.files["image"]
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image_bytes = image_file.read()
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img = Image.open(io.BytesIO(image_bytes))
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results = model(img, size=640) # reduce size=320 for faster inference
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return results.pandas().xyxy[0].to_json(orient="records")
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description="Flask API exposing YOLOv3 model")
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parser.add_argument("--port", default=5000, type=int, help="port number")
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args = parser.parse_args()
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model = torch.hub.load("ultralytics/yolov5", "yolov5s", force_reload=True) # force_reload to recache
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app.run(host="0.0.0.0", port=args.port) # debug=True causes Restarting with stat
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