food classifier with 101 classes

app.py

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+
+# 1.
+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
+with open("class_names.txt", "r") as f:
+    class_names = [food.strip('\n') for food in f.readlines()]
+
+# 2.
+effnetb2_food101, effnetb2_transforms = create_effnetb2_model(num_classes = 101)
+
+# Load saved weights
+effnetb2_food101.load_state_dict(torch.load("models/state_dict__effnetb2_food101_20_percent.pth",
+                                           map_location = torch.device('cpu')))
+
+
+# 3.
+def predict(img) -> Tuple[Dict, float]:
+    
+    # Start a timer
+    start_time = timer()
+    
+    # Transform the input image for use with EffNetB2
+    img = effnetb2_transforms(img).unsqueeze(0)
+    
+    # Put the model into eval mode, make prediction
+    effnetb2_food101.eval()
+    with torch.inference_mode():
+        # Pass transformed image through the model and turn the prediction logits into probabilities
+        pred_probs = torch.softmax(effnetb2_food101(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 pre time
+    end_time = timer()
+    pred_time = round(end_time - start_time, 4)
+    
+    # Return pred dict and pred time
+    return pred_labels_and_probs, pred_time
+
+# 4.
+title = 'FoodIdentifier Big (a little) 🍣🍕🥩'
+description = "An EfficientNetB2 feature extractor computer vision model to classify images as pizza, sushi or steak"
+article = " anything I want for the description of the description above 🤪"
+
+# Create example list
+# Get example filepaths in a list of lists
+example_list = [["examples/" + example] for example in os.listdir("examples")]
+
+# Create the Gradio demo
+demo = gr.Interface(fn = predict, # maps input to output
+                    inputs = gr.Image(type = 'pil'),
+                    outputs = [gr.Label(num_top_classes = 5, label = "Predictions"),
+                              gr.Number(label = "Prediction time (s)")],
+                    examples = example_list,
+                    title = title,
+                    description = description,
+                    article = article
+                   )
+
+# Launch the demo
+demo.launch(debug = False, # print errors locally?
+           share = True) # generate a publically shareable URL

class_names.txt

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+apple_pie
+baby_back_ribs
+baklava
+beef_carpaccio
+beef_tartare
+beet_salad
+beignets
+bibimbap
+bread_pudding
+breakfast_burrito
+bruschetta
+caesar_salad
+cannoli
+caprese_salad
+carrot_cake
+ceviche
+cheese_plate
+cheesecake
+chicken_curry
+chicken_quesadilla
+chicken_wings
+chocolate_cake
+chocolate_mousse
+churros
+clam_chowder
+club_sandwich
+crab_cakes
+creme_brulee
+croque_madame
+cup_cakes
+deviled_eggs
+donuts
+dumplings
+edamame
+eggs_benedict
+escargots
+falafel
+filet_mignon
+fish_and_chips
+foie_gras
+french_fries
+french_onion_soup
+french_toast
+fried_calamari
+fried_rice
+frozen_yogurt
+garlic_bread
+gnocchi
+greek_salad
+grilled_cheese_sandwich
+grilled_salmon
+guacamole
+gyoza
+hamburger
+hot_and_sour_soup
+hot_dog
+huevos_rancheros
+hummus
+ice_cream
+lasagna
+lobster_bisque
+lobster_roll_sandwich
+macaroni_and_cheese
+macarons
+miso_soup
+mussels
+nachos
+omelette
+onion_rings
+oysters
+pad_thai
+paella
+pancakes
+panna_cotta
+peking_duck
+pho
+pizza
+pork_chop
+poutine
+prime_rib
+pulled_pork_sandwich
+ramen
+ravioli
+red_velvet_cake
+risotto
+samosa
+sashimi
+scallops
+seaweed_salad
+shrimp_and_grits
+spaghetti_bolognese
+spaghetti_carbonara
+spring_rolls
+steak
+strawberry_shortcake
+sushi
+tacos
+takoyaki
+tiramisu
+tuna_tartare
+waffles

model.py

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+import torch
+import torchvision
+
+from torch import nn
+
+
+def create_effnetb2_model(num_classes:int=3, 
+                          seed:int=42):
+    """Creates an EfficientNetB2 feature extractor model and transforms.
+
+    Args:
+        num_classes (int, optional): number of classes in the classifier head. 
+            Defaults to 3.
+        seed (int, optional): random seed value. Defaults to 42.
+
+    Returns:
+        model (torch.nn.Module): EffNetB2 feature extractor model. 
+        transforms (torchvision.transforms): EffNetB2 image transforms.
+    """
+    # Create EffNetB2 pretrained weights, transforms and model
+    weights = torchvision.models.EfficientNet_B2_Weights.DEFAULT
+    transforms = weights.transforms()
+    model = torchvision.models.efficientnet_b2(weights=weights)
+
+    # Freeze all layers in base model
+    for param in model.parameters():
+        param.requires_grad = False
+
+    # Change classifier head with random seed for reproducibility
+    torch.manual_seed(seed)
+    model.classifier = nn.Sequential(
+        nn.Dropout(p=0.3, inplace=True),
+        nn.Linear(in_features=1408, out_features=num_classes),
+    )
+    
+    return model, transforms

requirements.txt

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+
+torch>1.12.0
+torchvision>0.13.0
+gradio>3.1.4