code: def isvariadic(obj):
      """Check whether the type `obj` is variadic.
      Parameters
      ----------
      obj : type
          The type to check
      Returns
      -------
      bool
          Whether or not `obj` is variadic
      Examples
      --------
      >>> # xdoctest: +SKIP
      >>> isvariadic(int)
      False
      >>> isvariadic(Variadic[int])
      True
      """
      return isinstance(obj, VariadicSignatureType)
  
file_path: pytorch/torch/fx/experimental/unification/multipledispatch/variadic.py
imports: from .utils import typename
label_desc: Use image node_id 1 for calling a global function with example usage: isvariadic(obj) and returns: isinstance