[cherry pick] add op: fused_feedforward(backward) #36730
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这个PR是fused_feedforward反向的代码 相关kernel实现：fused_dropout_act_bias, fused_residual_dropout_bias, fused_layernorm_residual_dropout_bias fused_feedforward是一个融合算子，该算子对transformer模型的feed forward层的算子进行融合和封装，使得前端只呈现一个接口，通过融合减少部分访存和kernel launch的时间，以此提升性能。
…ubate (PaddlePaddle#36704) 将 PaddlePaddle#35905 和 PaddlePaddle#35843 PR中新增的的python api接口移到incubate目录下。
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lanxianghit
approved these changes
Oct 26, 2021
limin2021
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Oct 26, 2021
xingfeng01
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Oct 26, 2021
TCChenlong
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Oct 26, 2021
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This is a fusion operator to compute feed forward layer in transformer model architecture.
reference PR:
add op: fused_feedforward(backward)
Move fused_attention and fused_feedforward functional api path to incubate