code: def warn_if_inf(
      value,
      msg="",
      allow_posinf=False,
      allow_neginf=False,
      *,
      filename=None,
      lineno=None,
  ):
      """
      A convenient function to warn if a Tensor or its grad contains any inf,
      also works with numbers.
      """
      if filename is None:
          try:
              frame = sys._getframe(1)
          except ValueError:
              filename = "sys"
              lineno = 1
          else:
              filename = frame.f_code.co_filename
              lineno = frame.f_lineno
  
      if torch.is_tensor(value) and value.requires_grad:
          value.register_hook(
              lambda x: warn_if_inf(
                  x,
                  "backward " + msg,
                  allow_posinf,
                  allow_neginf,
                  filename=filename,
                  lineno=lineno,
              )
          )
  
      if (not allow_posinf) and (
          value == math.inf
          if isinstance(value, numbers.Number)
          else (value == math.inf).any()
      ):
          warnings.warn_explicit(
              "Encountered +inf{}".format(": " + msg if msg else "."),
              UserWarning,
              filename,
              lineno,
          )
      if (not allow_neginf) and (
          value == -math.inf
          if isinstance(value, numbers.Number)
          else (value == -math.inf).any()
      ):
          warnings.warn_explicit(
              "Encountered -inf{}".format(": " + msg if msg else "."),
              UserWarning,
              filename,
              lineno,
          )
  
      return value
  
imports: import functools
  import math
  import numbers
  import random
  import sys
  import timeit
  import warnings
  from collections import defaultdict
  from contextlib import contextmanager
  from itertools import zip_longest
  import numpy
  import torch
  from pyro.poutine.util import site_is_subsample
label_desc: Use image node_id 7 for calling a global function with example usage: warn_if_inf(value, msg, allow_posinf, allow_neginf) and returns: value