app.py

import onnx
import numpy as np
import onnxruntime as ort
from PIL import Image
import cv2
import os
import gradio as gr

os.system("wget https://s3.amazonaws.com/onnx-model-zoo/synset.txt")


with open('synset.txt', 'r') as f:
    labels = [l.rstrip() for l in f]
    
os.system("wget https://github.com/AK391/models/raw/main/vision/classification/densenet-121/model/densenet-9.onnx")

os.system("wget https://s3.amazonaws.com/model-server/inputs/kitten.jpg")



model_path = 'densenet-9.onnx'
model = onnx.load(model_path)
session = ort.InferenceSession(model.SerializeToString())

def get_image(path):
    with Image.open(path) as img:
        img = np.array(img.convert('RGB'))
    return img
    
def preprocess(img):
    img = img / 255.
    img = cv2.resize(img, (256, 256))
    h, w = img.shape[0], img.shape[1]
    y0 = (h - 224) // 2
    x0 = (w - 224) // 2
    img = img[y0 : y0+224, x0 : x0+224, :]
    img = (img - [0.485, 0.456, 0.406]) / [0.229, 0.224, 0.225]
    img = np.transpose(img, axes=[2, 0, 1])
    img = img.astype(np.float32)
    img = np.expand_dims(img, axis=0)
    return img

def predict(path):
    img = get_image(path)
    img = preprocess(img)
    ort_inputs = {session.get_inputs()[0].name: img}
    preds = session.run(None, ort_inputs)[0]
    preds = np.squeeze(preds)
    a = np.argsort(preds)
    results = {}
    for i in a[0:5]:    
        results[labels[a[i]]] = float(preds[a[i]])
    return results
       

title="DenseNet-121"
description="DenseNet-121 is a convolutional neural network for classification."

examples=[['kitten.jpg']]
gr.Interface(predict,gr.inputs.Image(type='filepath'),"label",title=title,description=description,examples=examples).launch(enable_queue=True,debug=True)