# Try to use the new importlib.resources, fall back to pkg_resources
try:
    from importlib import resources
    
    def get_resource_filename(package_name, resource_name):
        try:
            # For Python 3.9+
            return str(resources.files(package_name) / resource_name)
        except AttributeError:
            # For Python 3.7-3.8
            with resources.path(package_name, resource_name) as path:
                return str(path)
except ImportError:
    import warnings
    warnings.filterwarnings("ignore", category=UserWarning, message="pkg_resources is deprecated")
    from pkg_resources import resource_filename
    
    def get_resource_filename(package_name, resource_name):
        return resource_filename(package_name, resource_name)

PREPACKAGED_MODELS_DIR = get_resource_filename(__name__, "pretrained")

from .perth_net_implicit.perth_watermarker import PerthImplicitWatermarker```

Thanks a lot