code: def isnan(input):
      return ivy.isnan(input)
  
imports: import ivy
  import ivy.functional.frontends.torch
  from ivy.func_wrapper import with_unsupported_dtypes
  from ivy.functional.frontends.torch.func_wrapper import to_ivy_arrays_and_back
  from collections import namedtuple
label_desc: Use image node_id 15 for calling a global function with example usage: isnan(input) and returns: ivy