code: def _get_optional_parameters(self):
      return {
          "batch_size",
          "cnn_dropout",
          "rnn_dropout",
          "time_step",
          "cnn_height",
          "long_num",
          "ar_size",
          "loss",
          "cnn_hid_size",
          "rnn_hid_sizes",
          "lr",
      }
  
imports: import pickle
  import numpy
  import time
  from tensorflow.keras.models import Model
  from tensorflow.keras.layers import *
  from tensorflow.keras.initializers import TruncatedNormal, Constant
  import tensorflow.keras.backend
  import tensorflow
  from zoo.orca.automl.metrics import Evaluator
  from zoo.orca.automl.model.abstract import BaseModel
label_desc: Use image node_id 17 for calling the MTNetKeras obj's underlying member method code with example usage: obj._get_optional_parameters() and returns: unknown