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# 1. Imports and class names setup
import gradio as gr
import os
import torch
from model import create_effnetb2_model
from timeit import default_timer as timer
from typing import Tuple , Dict
# Setup class names
class_names = ['pizza','steak','sushi']
# Model and transforms preparation
# Create EffNetB2 model
effnetb2 , effnetb2_transforms = create_effnetb2_model(num_classes=len(class_names))
# load and save weights
effnetb2.load_state_dict(torch.load("effnetb2.pth",map_location=torch.device('cpu')))
# Predict function
def predict(img):
"""
Transforms and performs a prediction on img and returns prediction and time taken.
"""
# Start timer
start_time = timer()
# transform the target image and add a batch dimension
img = effnetb2_transforms(img).unsqueeze(0)
# put model into evaluation mode and turn on inference mode
effnetb2.eval()
with torch.inference_mode():
# pass the transformed image through the model and turn the pred logits into prediction probabilities
pred_probs = torch.softmax(effnetb2(img), dim=1)
# create a prediction label and prediction probability dictionary
pred_labels_and_probs = {class_names[i]: float(pred_probs[0][i]) for i in range(len(class_names))}
# calculate time
pred_time = round(timer() - start_time , 5)
# return the prediction dictionary
return pred_labels_and_probs, pred_time
## Gradio app
# Create title, description and article strings
title = "FoodVision Mini 🍕🥩🍣"
description = "An EfficientNetB2 feature extractor computer vision model to classify images of food as pizza, steak or sushi."
article = "Created "
# Create examples list from "examples/" directory
#example_list = [["examples/" + example] for example in os.listdir("examples")]
# Create the Gradio demo
demo = gr.Interface(fn=predict, # mapping function from input to output
inputs=gr.Image(type="pil"), # what are the inputs?
outputs=[gr.Label(num_top_classes=3, label="Predictions"), # what are the outputs?
gr.Number(label="Prediction time (s)")], # our fn has two outputs, therefore we have two outputs
# Create examples list from "examples/" directory
#examples=example_list,
title=title,
description=description,
article=article)
# Launch the demo!
demo.launch()
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