presto-ml/src/main/java/io/prestosql/plugin/ml/MLFunctions.java/MLFunctions/getOrLoadModel
class MLFunctions:    private static Model getOrLoadModel(Slice slice)
    {
        HashCode modelHash = ModelUtils.modelHash(slice);

        Model model = MODEL_CACHE.getIfPresent(modelHash);
        if (model == null) {
            model = ModelUtils.deserialize(slice);
            MODEL_CACHE.put(modelHash, model);
        }

        return model;
    }