def input_fn(request_body, request_content_type):
    import torch
    import torchvision.transforms as transforms
    from PIL import Image
    import io
    f = io.BytesIO(request_body)
    input_image = Image.open(f).convert('RGB')
    preprocess = transforms.Compose([
      transforms.Resize(255),
      transforms.CenterCrop(224),
      transforms.ToTensor(),
      transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]),
    ])
    input_tensor = preprocess(input_image)
    input_batch = input_tensor.unsqueeze(0)
    return input_batch