code: def output(self):
      # () -> list
      toret = [{} for i in range(self.num_docs)]
      X = self.X.tocoo()
      for row, col, val in zip(X.row, X.col, X.data):
          toret[row][self.idx_store.getval(col)] = val.item()
      return toret
  
imports: import numpy
label_desc: Use image node_id 2 for calling the FeatureLister obj's underlying member method code with example usage: obj.output() and returns: toret