code: def output_name(self, auxiliary_output=None):
      node_name = (
          "m_batchnorm"
          if self.layer_type == "fast-lstm-batchnorm-layer"
          else "m"
      )
      if auxiliary_output is not None:
          if auxiliary_output == "c":
              node_name = "c"
              self.c_needed = True
          else:
              raise RuntimeError(
                  "Unknown auxiliary output name {0}".format(
                      auxiliary_output
                  )
              )
      return "{0}.{1}".format(self.name, node_name)
  
imports: from __future__ import print_function
  import math
  import re
  import sys
  from libs.nnet3.xconfig.basic_layers import XconfigLayerBase
label_desc: Use image node_id 6 for calling the XconfigFastLstmLayer obj's underlying member method code with example usage: obj.output_name(auxiliary_output) and returns: str