code: def is_py_torch_function(f: NativeFunction) -> bool:
      return f.python_module is None and Variant.function in f.variants
  
imports: import itertools
  import re
  from collections import defaultdict
  from typing import Callable, Dict, Iterable, List, Optional, Sequence, Set, Tuple
  import yaml
  from torchgen.api import cpp
  from torchgen.api.python import arg_parser_output_exprs, cpp_dispatch_exprs, cpp_dispatch_target, dispatch_lambda_args, dispatch_lambda_exprs, dispatch_lambda_return_str, has_tensor_options, namedtuple_fieldnames, PythonSignature, PythonSignatureDeprecated, PythonSignatureGroup, PythonSignatureNativeFunctionPair, signature, signature_from_schema
  from torchgen.code_template import CodeTemplate
  from torchgen.context import with_native_function
  from torchgen.gen import cpp_string, parse_native_yaml, parse_tags_yaml
  from torchgen.model import Argument, BaseOperatorName, FunctionSchema, NativeFunction, Type, Variant
  from torchgen.utils import FileManager, split_name_params
  from torchgen.yaml_utils import YamlLoader
  from .gen_trace_type import should_trace
label_desc: Use image node_id 5 for calling a global function with example usage: is_py_torch_function(f) and returns: unknown