def METHOD_NAME(frame_data: Any) -> Any:
    """
    Masks the target image data to make sure we cannot use it at model evaluation
    time. Assumes the first batch element is target, the rest are source.
    """
    frame_data_for_eval = copy.deepcopy(frame_data)
    for k in ("image_rgb", "depth_map", "fg_probability", "mask_crop"):
        value = getattr(frame_data_for_eval, k)
        value[0].zero_()
    return frame_data_for_eval