code: def set_default_configs(self):
      self.config = {
          "input": "[-1]",
          "cell-dim": -1,  # this is a compulsory argument
          "recurrent-projection-dim": -1,
          "non-recurrent-projection-dim": -1,
          "clipping-threshold": 30.0,
          "delay": -1,
          # if you want to set 'self-repair-scale' (c.f. the
          # self-repair-scale-nonlinearity config value in older LSTM layers), you can
          # add 'self-repair-scale=xxx' to
          # lstm-nonlinearity-options.
          "lstm-nonlinearity-options": " max-change=0.75",
          # the affine layer contains 4 of our old layers -> use a
          # larger max-change than the normal value of 0.75.
          "ng-affine-options": " max-change=1.5",
          "l2-regularize": 0.0,
          "decay-time": -1.0,
          "zeroing-interval": 20,
          "zeroing-threshold": 15.0,
          "dropout-proportion": -1.0,  # If -1.0, no dropout will
          # be used)
      }
  
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 2 for calling the XconfigFastLstmpLayer obj's underlying member method code with example usage: obj.set_default_configs() without return types