code: def fetch_hawkes_bund_data():
      """Load Hawkes formatted bund data from
      https://github.com/X-DataInitiative/tick-datasets/tree/master/hawkes/bund
  
      This data is meant to be fitted with Hawkes processes. It contains for each
      day 4 time series representing:
  
          1. Mid-price movement up
          2. Mid-price movement down
          3. Buyer initiated trades that do not move the mid-price
          4. Seller initiated trades that do not move the mid-price
  
      Returns
      -------
      output : `list` of `list` of `np.ndarray`, dim=(20, 4, _)
          List of 20 days of 4 timestamps data.
      """
      dataset = "hawkes/bund/bund.npz"
      return [
          list(timestamps)
          for _, timestamps in fetch_tick_dataset(dataset)
      ]
  
label_desc: Use image node_id 1 for calling a global function with example usage: fetch_hawkes_bund_data() and returns: unknown