code: def _check_configs(self):
      assert (
          self.time_step >= 1
      ), "Invalid configuration value. 'time_step' must be larger than 1"
      assert (
          self.time_step >= self.ar_window
      ), "Invalid configuration value. 'ar_window' must not exceed 'time_step'"
      assert 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 zoo.orca.automl.metrics import Evaluator
  from zoo.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