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### 1. Imports and class names setup ###
import gradio as gr
import os
import torch
from model import create_vit_model
from timeit import default_timer as timer
from typing import Tuple, Dict
# Setup class names
class_names = ["D00-Longitudinal Crack", "D10-Transverse Crack", "D20-Aligator Crack", "D40-Pothole",
"D43-Cross Walk Blur", "D44-White Line Blur", "D50-Manhole Cover (TBC)"]
### 2. Model and transforms preparation ###
# Create ViT model
vit, vit_transforms = create_vit_model(
num_classes=len(class_names), # len(class_names) would also work
)
# Load saved weights
vit.load_state_dict(
torch.load(
f="Pretrained_vit_feature_extractor_RDDV2AMC.pth",
map_location=torch.device("cpu"), # load to CPU
)
)
### 3. Predict function ###
# Create predict function
def predict(img) -> Tuple[Dict, float]:
"""Transforms and performs a prediction on img and returns prediction and time taken.
"""
# Start the timer
start_time = timer()
# Transform the target image and add a batch dimension
img = vit_transforms(img).unsqueeze(0)
# Put model into evaluation mode and turn on inference mode
vit.eval()
with torch.inference_mode():
# Pass the transformed image through the model and turn the prediction logits into prediction probabilities
pred_probs = torch.softmax(vit(img), dim=1)
# Create a prediction label and prediction probability dictionary for each prediction class (this is the required format for Gradio's output parameter)
pred_labels_and_probs = {class_names[i]: float(pred_probs[0][i]) for i in range(len(class_names))}
# Calculate the prediction time
pred_time = round(timer() - start_time, 5)
# Return the prediction dictionary and prediction time
return pred_labels_and_probs, pred_time
### 4. Gradio app ###
# Create title, description and article strings
title = "Road Damages Detection 🚧"
description = "A ViT feature extractor computer vision model to classify images of common road damages."
article = "Created at https://huggingface.co/spaces/erictam/Road-Damages-Detection_Multi-Class"
# 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=7, 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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