如何将嵌套字典中的值映射到Pydantic模型？

from pydantic import BaseModel
from typing import Dict

class MyModel(BaseModel):
    field1: str
    field2: int
    field3: float

def map_dict_to_model(data: Dict[str, Dict[str, str]]) -> MyModel:
    mapped_data = {}
    for key, value in data.items():
        mapped_data[key] = MyModel(**value)
    return mapped_data

nested_dict = {
    "item1": {"field1": "value1", "field2": "1", "field3": "3.14"},
    "item2": {"field1": "value2", "field2": "2", "field3": "2.71"}
}

mapped_data = map_dict_to_model(nested_dict)