code: def _validate_fft_args(workers, plan, norm):
      if workers is not None:
          raise ValueError(xp_unsupported_param_msg("workers"))
      if plan is not None:
          raise ValueError(xp_unsupported_param_msg("plan"))
      if norm is None:
          norm = "backward"
      return norm
  
imports: from scipy._lib._array_api import array_namespace, is_numpy, xp_unsupported_param_msg, is_complex
  from .None import _pocketfft
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: _validate_fft_args(workers, plan, norm) and returns: norm