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    [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
reduce_mean_op.cc 4.0 KB