code: def _check_configs(self):
      from bigdl.nano.utils.common import invalidInputError
  
      invalidInputError(
          self.time_step >= 1,
          "Invalid configuration value. 'time_step' must be larger than 1",
      )
      invalidInputError(
          self.time_step >= self.ar_window,
          "Invalid configuration value. 'ar_window' must not exceed 'time_step'",
      )
      invalidInputError(
          isinstance(self.rnn_hid_sizes, list),
          "Invalid configuration value."
          " 'rnn_hid_sizes' must be a list of integers",
      )
  
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 bigdl.orca.automl.metrics import Evaluator
  from bigdl.orca.automl.model.abstract import BaseModel
label_desc: Use image node_id 3 for calling the MTNetKeras obj's underlying member method code with example usage: obj._check_configs() without return types