presto-ml/src/main/java/io/prestosql/plugin/ml/MLPlugin.java/MLPlugin/getFunctions
class MLPlugin:    @Override
    public Set<Class<?>> getFunctions()
    {
        return ImmutableSet.<Class<?>>builder()
                .add(LearnClassifierAggregation.class)
                .add(LearnVarcharClassifierAggregation.class)
                .add(LearnRegressorAggregation.class)
                .add(LearnLibSvmClassifierAggregation.class)
                .add(LearnLibSvmVarcharClassifierAggregation.class)
                .add(LearnLibSvmRegressorAggregation.class)
                .add(EvaluateClassifierPredictionsAggregation.class)
                .add(MLFunctions.class)
                .addAll(ML_FEATURE_FUNCTIONS)
                .build();
    }