text: """
  Configurations for *preprocessing* pipeline.
  """
  
  METRICS = [
      "fa",
      "adc",
      "ad",
      "rd",
      "cl",
      "cp",
      "cs",
      "evec",
      "eval",
  ]
  #: i/o
  INPUT_NODE_FIELDS = ["dwi_file"]
  OUTPUT_NODE_FIELDS = ["metrics"]
  
  #: Keyword arguments
  DWI2TENSOR_KWARGS = dict()
  TENSOR2METRIC_KWARGS = {
      f"out_{metric}": f"{metric}.nii.gz" for metric in METRICS
  }
  LISTIFY_KWARGS = dict(numinputs=len(METRICS))
  