code: def data_from_cluster_id(self, cluster_id, graph, data):
          
          if cluster_id in graph["nodes"]:
              cluster_members = graph["nodes"][cluster_id]
              cluster_members_data = data[cluster_members]
              return cluster_members_data
          else:
              return np.array([])
docs: Returns the original data of each cluster member for a given cluster ID
  
          Parameters
          ----------
          cluster_id : String
              ID of the cluster.
          graph : dict
              The resulting dictionary after applying map()
          data : Numpy Array
              Original dataset. Accepts both 1-D and 2-D array.
  
          Returns
          -------
          entries:
              rows of cluster member data as Numpy array.