code: def __init__(
      self,
      a: int = 1,
      b: int = field(default_factory=lambda: 2),  # noqa
  ) -> None:
      self.a = a
      self.b = b
  
imports: import abc
  import os
  import unittest
  from reagent.core.configuration import make_config_class, resolve_defaults
  from reagent.core.dataclasses import dataclass, field
  from reagent.core.registry_meta import RegistryMeta
  from reagent.core.tagged_union import TaggedUnion
label_desc: Use image node_id 1 to create a new A object  with example: obj = A(a, b)