code: def _get_optional_parameters(self):
      return {
          "lstm_hidden_dim",
          "lstm_layer_num",
          "teacher_forcing",
      } | super()._get_optional_parameters()
  
file_path: analytics-zoo/pyzoo/zoo/chronos/model/Seq2Seq_pytorch.py
imports: import torch
  import torch.nn
  from zoo.orca.automl.model.base_pytorch_model import PytorchBaseModel, PYTORCH_REGRESSION_LOSS_MAP
  import numpy
label_desc: Use image node_id 5 for calling the Seq2SeqPytorch obj's underlying member method code with example usage: obj._get_optional_parameters() and returns: unknown