text: from sklearn.model_selection import train_test_split
  import pandas as pd
  
  data = pd.read_csv('http://apmonitor.com/pds/uploads/Main/tclab_data6.txt')
  data.set_index('Time',inplace=True)
  
  # Split into train and test subsets (20% for test)
  train, test = train_test_split(data, test_size=0.2, shuffle=False)