message: change from deprecated version to a new version
diff: @@ -131,7 +131,7 @@ def dataset(y_name="price", train_fraction=0.7):
  # booleans but we are dealing with symbolic tensors.
  return ~in_training_set(line)
  - base_dataset = (tf.contrib.data
  + base_dataset = (tf.data
  # Get the lines from the file.
  .TextLineDataset(path)
  # drop lines with question marks.
  