code: def create_data(self):
      sample_num = np.random.randint(100, 200)
      self.train_df = pd.DataFrame(
          {
              "datetime": pd.date_range("1/1/2019", periods=sample_num),
              "value": np.random.randn(sample_num),
          }
      )
      val_sample_num = np.random.randint(20, 30)
      self.validation_df = pd.DataFrame(
          {
              "datetime": pd.date_range(
                  "1/1/2019", periods=val_sample_num
              ),
              "value": np.random.randn(val_sample_num),
          }
      )
  
file_path: analytics-zoo/pyzoo/test/zoo/chronos/autots/deprecated/test_auto_ts.py
imports: import pytest
  import numpy
  from test.zoo.pipeline.utils.test_utils import ZooTestCase
  from zoo.chronos.autots.deprecated.config.recipe import LSTMGridRandomRecipe, MTNetGridRandomRecipe
  from zoo.chronos.autots.deprecated.forecast import AutoTSTrainer
  from zoo.chronos.autots.deprecated.forecast import TSPipeline
  import pandas
label_desc: Use image node_id 3 for calling the TestChronosAutoTS obj's underlying member method code with example usage: obj.create_data() without return types