inference.py

import tensorflow as tf
import numpy as np
from PIL import Image
from typing import Dict

# Load the ResNetV2 model
model = tf.keras.models.load_model("resnetv2_model.h5")

# Define the handler for the Inference API
def predict(inputs: Dict) -> Dict:
    """
    Handle inference requests.
    Args:
        inputs (Dict): A dictionary with a key 'image' containing the base64-encoded image.
    Returns:
        Dict: A dictionary containing the predicted class label.
    """
    # Decode the image
    if "image" not in inputs:
        return {"error": "No image found in inputs"}
    
    # Preprocess the input image
    image = preprocess_image(inputs["image"])
    
    # Perform inference
    prediction = model.predict(image)
    predicted_class = np.argmax(prediction, axis=1)[0]  # Get the predicted class index
    
    # Return the predicted class
    return {"label": int(predicted_class)}

def preprocess_image(image_base64: str) -> np.ndarray:
    """
    Preprocess the input image for ResNetV2.
    Args:
        image_base64 (str): Base64-encoded image.
    Returns:
        np.ndarray: Preprocessed image ready for inference.
    """
    from io import BytesIO
    import base64

    # Decode the base64 image
    image_data = base64.b64decode(image_base64)
    image = Image.open(BytesIO(image_data)).convert("RGB")
    
    # Resize and normalize the image
    image = image.resize((224, 224))
    image_array = np.array(image) / 255.0  # Normalize pixel values to [0, 1]
    image_array = np.expand_dims(image_array, axis=0)  # Add batch dimension
    
    return image_array