SOLVED Dear community, I have some issues probably related to input/output definitions when trying to run

bento build

(running bentoml serve works like a charm). Bentoml version 1.4.3 I get an RecursionError originating from __flatten_field_() in /_bentoml_sdk/method.py UPDATE: I was able to track it down to one of my pydantic definitions, and now I assume that the Concept->Relation->Concept causes the recursion. SOLVED: I replaced the circular reference to Concept in Relation with string fields.

class Coding(BaseModel):
    code: str
    system: str


class Concept(BaseModel):
    text: str
    text_span_normalized: Optional[str] = None
    categories: List[str]
    codes: List[Coding]
    relations: "Optional[List[Relation]]" = None


class Relation(BaseModel):
    name: str
    target: Concept

Can you confirm that the error is related to the pydantic type definition? If yes, any idea how to solve it?