public ExpressionNode expression(FeatureArguments arguments, RankProfileTransformContext context) {
        ExpressionFunction expression = selectExpression(arguments);
        if (sourceModel.isPresent() && context != null) // we should verify
            verifyInputs(expression.getBody(), sourceModel.get(), context.rankProfile(), context.queryProfiles());
        return expression.getBody().getRoot();
    }
Returns the expression matching the given arguments.
config-model/src/main/java/com/yahoo/vespa/model/ml/ConvertedModel.java