code: def SelectComponent(ds, idxs):
      
      return MapData(ds, lambda dp: [dp[i] for i in idxs])
docs: Select / reorder components from datapoints.
  
      Args:
          ds (DataFlow): input DataFlow.
          idxs (list[int]): a list of component indices.
  
      Example:
  
      .. code-block:: none
  
          original df produces: [c1, c2, c3]
          idxs: [2,1]
          this df: [c3, c2]