code: def decl_registration_declarations(self) -> str:
      type_s = self.nctype.cpp_type_registration_declarations()
      mb_default = ""
      if self.default is not None:
          mb_default = f"={self.default}"
      return f"{type_s} {self.name}{mb_default}"
  
imports: from abc import ABC, abstractmethod
  from dataclasses import dataclass
  from enum import auto, Enum
  from typing import List, Optional, Union
  from torchgen.model import Argument, SelfArgument, TensorOptionsArguments
label_desc: Use image node_id 5 for calling the Binding obj's underlying member method code with example usage: obj.decl_registration_declarations() and returns: type_s, str, self, mb_default