@Experimental
    public static final ConfigOption<String> PYTHON_EXECUTION_MODE =
        ConfigOptions.key("python.execution-mode")
                .stringType()
                .defaultValue("process")
                .withDescription(
                        "Specify the python runtime execution mode. The optional values are `process`, `multi-thread` and `sub-interpreter`. "
                                + "The `process` mode means that the Python user-defined functions will be executed in separate Python process. "
                                + "The `multi-thread` mode means that the Python user-defined functions will be executed in the same thread as Java Operator, but it will be affected by GIL performance. "
                                + "The `sub-interpreter` mode means that the Python user-defined functions will be executed in python different sub-interpreters rather than different threads of one interpreter, "
                                + "which can largely overcome the effects of the GIL, but it maybe fail in some CPython extensions libraries, such as numpy, tensorflow. "
                                + "Note that if the python operator dose not support `multi-thread` and `sub-interpreter` mode, we will still use `process` mode.");