Is there any way of creating a service using functions?

[mr-mapache]

I had bad experience with class based controllers in the past, since classes allow state in route definitions and I prefer my apis to be stateless. I'm reading docs and I see that I can create services like this:

@bentoml.service
class Summarization:
    def __init__(self) -> None:
        self.pipeline = pipeline('summarization')

    @bentoml.api
    def summarize(self, text: str = EXAMPLE_INPUT) -> str:
        result = self.pipeline(text)
        return f"Hello world! Here's your summary: {result[0]['summary_text']}"

Is there any way to turn this into a function in order to force the service to be stateless? like this:

service = Service(name='sumarization')

@service.api
def sumarize(self, text: str) -> str:
    ...