code: def output_dim(self, auxiliary_output=None):
      if auxiliary_output is not None:
          if auxiliary_output == "c":
              self.c_needed = True
              return self.config["cell-dim"]
              # add code for other auxiliary_outputs here when we decide to expose them
          else:
              raise RuntimeError(
                  "Unknown auxiliary output name {0}".format(
                      auxiliary_output
                  )
              )
      return self.config["cell-dim"]
  
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 7 for calling the XconfigFastLstmLayer obj's underlying member method code with example usage: obj.output_dim(auxiliary_output) and returns: self, self