code: def signature_str(
      self, *, skip_outputs: bool = False, symint: bool = True
  ) -> str:
      args = self.arguments(skip_outputs=skip_outputs)
      schema_formals: List[str] = [
          a.argument_str(method=self.method, symint=symint)
          for a in args
      ]
      positional_argc = len(self.input_args)
      if len(schema_formals) > positional_argc:
          schema_formals.insert(positional_argc, "*")
  
      return f'{self.name}({", ".join(schema_formals)})'
  
imports: from dataclasses import dataclass
  from typing import Dict, List, Optional, Sequence, Set, Tuple, Union
  from torchgen.api import cpp
  from torchgen.api.types import Binding, CppSignature, CppSignatureGroup
  from torchgen.gen import pythonify_default
  from torchgen.model import Argument, BaseTy, BaseType, FunctionSchema, ListType, NativeFunction, OptionalType, Return, Type, Variant
label_desc: Use image node_id 5 for calling the PythonSignature obj's underlying member method code with example usage: obj.signature_str() and returns: self, str, str, str