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| ### 1. Imports and class names setup ### | |
| import gradio as gr | |
| import os | |
| import torch | |
| import torchvision.transforms as T | |
| from model import create_effnet_b2 | |
| from timeit import default_timer as timer | |
| from typing import Tuple, Dict | |
| # Setup class names | |
| class_names = ['pizza', 'steak', 'sushi'] | |
| ### 2. Model and transforms preparation ### | |
| test_tsfm = T.Compose([T.Resize((224,224)), | |
| T.ToTensor(), | |
| T.Normalize(mean=[0.485, 0.456, 0.406], # 3. A mean of [0.485, 0.456, 0.406] (across each colour channel) | |
| std=[0.229, 0.224, 0.225]) # 4. A standard deviation of [0.229, 0.224, 0.225] (across each colour channel), | |
| ]) | |
| # Create EffNetB2 Model | |
| effnetb2, test_transform = create_effnet_b2(num_of_class=len(class_names), | |
| transform=test_tsfm, | |
| seed=42) | |
| # saved_path = 'demos\foodvision_mini\09_pretrained_effnetb2_feature_extractor_pizza_steak_sushi_20_percent.pth' | |
| saved_path = '07_effnetb2_data_50_percent_10_epochs.pth' | |
| print('Loading Model State Dictionary') | |
| # Load saved weights | |
| effnetb2.load_state_dict( | |
| torch.load(f=saved_path, | |
| map_location=torch.device('cpu'), # load to CPU | |
| ) | |
| ) | |
| print('Model Loaded ...') | |
| ### 3. Predict function ### | |
| # Create predict function | |
| from typing import Tuple, Dict | |
| 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 = test_tsfm(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 prediction logits into prediction probabilities | |
| pred_probs = torch.softmax(effnetb2(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= 'FoodVision Mini 🍕🥩🍣' | |
| description = "An EfficientNetB2 feature extractor computer vision model to classify images of food as pizza, steak or sushi." | |
| article = "Created at Chukwuka using Mr. DBourke Tutorial [09. PyTorch Model Deployment](https://www.learnpytorch.io/09_pytorch_model_deployment/)." | |
| # 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.inputs.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 | |
| examples=example_list, | |
| title=title, | |
| description=description, | |
| article=article | |
| ) | |
| # Launch the demo | |
| print('Gradio Demo Launched') | |
| demo.launch() | |