utils/utils.py

def preprocess_resize_256(image):
    if image.mode != 'RGB':
        image = image.convert('RGB')
    return transforms.Resize((256, 256))(image)

def preprocess_resize_224(image):
    if image.mode != 'RGB':
        image = image.convert('RGB')
    return transforms.Resize((224, 224))(image)

def postprocess_pipeline(prediction, class_names):
    # Assumes HuggingFace pipeline output
    return {pred['label']: float(pred['score']) for pred in prediction}

def postprocess_logits(outputs, class_names):
    # Assumes model output with logits
    logits = outputs.logits.cpu().numpy()[0]
    probabilities = softmax(logits)
    return {class_names[i]: probabilities[i] for i in range(len(class_names))}

def postprocess_binary_output(output, class_names):
    # output can be a dictionary {"probabilities": numpy_array} or directly a numpy_array
    import logging
    logger = logging.getLogger(__name__)
    probabilities_array = None
    if isinstance(output, dict) and "probabilities" in output:
        probabilities_array = output["probabilities"]
    elif isinstance(output, np.ndarray):
        probabilities_array = output
    else:
        logger.warning(f"Unexpected output type for binary post-processing: {type(output)}. Expected dict with 'probabilities' or numpy.ndarray.")
        return {class_names[0]: 0.0, class_names[1]: 1.0}

    logger.info(f"Debug: Probabilities array entering postprocess_binary_output: {probabilities_array}, type: {type(probabilities_array)}, shape: {getattr(probabilities_array, 'shape', None)}")

    if probabilities_array is None:
        logger.warning("Probabilities array is None after extracting from output. Returning default scores.")
        return {class_names[0]: 0.0, class_names[1]: 1.0}

    if probabilities_array.size == 1:
        fake_prob = float(probabilities_array.item())
    elif probabilities_array.size == 2:
        fake_prob = float(probabilities_array[0])
    else:
        logger.warning(f"Unexpected probabilities array shape for binary post-processing: {probabilities_array.shape}. Expected size 1 or 2.")
        return {class_names[0]: 0.0, class_names[1]: 1.0}

    real_prob = 1.0 - fake_prob # Ensure Fake and Real sum to 1
    return {class_names[0]: fake_prob, class_names[1]: real_prob}

def to_float_scalar(value):
    if isinstance(value, np.ndarray):
        return float(value.item()) # Convert numpy array scalar to Python float
    return float(value) # Already a Python scalar or convertible type
import numpy as np
import io
from PIL import Image, ImageFilter, ImageChops
from torchvision import transforms

def softmax(vector):
    e = np.exp(vector - np.max(vector))  # for numerical stability
    probabilities = e / e.sum()
    return [float(p.item()) for p in probabilities] # Convert numpy array elements to Python floats using .item()

def augment_image(img_pil, methods, rotate_degrees=0, noise_level=0, sharpen_strength=1):
    for method in methods:
        if method == "rotate":
            img_pil = img_pil.rotate(rotate_degrees)
        elif method == "add_noise":
            noise = np.random.normal(0, noise_level, img_pil.size[::-1] + (3,)).astype(np.uint8)
            img_pil = Image.fromarray(np.clip(np.array(img_pil) + noise, 0, 255).astype(np.uint8))
        elif method == "sharpen":
            img_pil = img_pil.filter(ImageFilter.UnsharpMask(radius=2, percent=sharpen_strength, threshold=3))
    return img_pil, img_pil

def convert_pil_to_bytes(image, format='JPEG'):
    img_byte_arr = io.BytesIO()
    image.save(img_byte_arr, format=format)
    img_byte_arr = img_byte_arr.getvalue()
    return img_byte_arr