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    • Q
      [cherry-pick]Update backward appending stragety to support double backward. (#18216) · a839f724
      qingqing01 提交于
      * Update backward appending stragety to support double backward and fix some bug. (#18104)
      
      * Update backward.py:
           - If there is no input grad var in all outputs of previous ops, do not append this op into graph.
           - Only apply this stragety when double backward.
      * Update some double backward op.
      * Update sum_op to judge whether a tensor is empty by numel or IsInitialized().
      a839f724