当我使用numpy多项式或astropy多项式时，我如何实现asdf扩展？

import asdf
from asdf.extension import AsdfExtension
from asdf.tags.core.ndarray import NDArrayType

class MyNumpyExtension(AsdfExtension):
    @property
    def types(self):
        return [NDArrayType]

    @property
    def tag_mapping(self):
        return [('tag:yourdomain.org:my_numpy_array', 'ndarray')]

    def __init__(self):
        self.version = '1.0.0'

    def to_yaml_tree(self, data, tag, ctx):
        # 将numpy多项式转换为适合yaml格式的数据结构
        # 实现代码

    def from_yaml_tree(self, node, tag, ctx):
        # 将yaml格式的数据结构转换为numpy多项式
        # 实现代码

asdf.extension.register_extension(MyNumpyExtension())

import numpy as np
import asdf

# 创建一个numpy多项式
poly = np.poly1d([1, 2, 3])

# 将numpy多项式转换为yaml格式并保存到文件中
with asdf.AsdfFile() as af:
    af.tree = {'poly': poly}
    af.write_to('poly.yaml')

# 从文件中加载yaml格式的数据并将其转换回numpy多项式
with asdf.open('poly.yaml') as af:
    loaded_poly = af.tree['poly']