code: def load_boston_multitask():
      
      dataset = datasets.load_boston()
      y = dataset.target
      target = np.column_stack([y, 2 * y + 5])
      return Dataset(load_boston.__doc__, dataset.data, target, r2_score)
docs: Boston House Prices Dataset with a synthetic multitask output.
  
      The multitask output is obtained by applying a linear transformation
      to the original y and adding it as a second output column.