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Performance optimization of LayerNorm on CPU #15313
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Description
imporve LayerNormLastDim() performance, it will benefit the gluonnlp/bert and maybe other nlp task.
test the performance with both MXNet master and this pr at skx8180-1s with the performance test script , get speedup 1.27X~2.31X.
Through the profiling of gluonnlp/bert/finetune_classifiy.py, get speedup 1.8X~3.37X on LayerNorm op.
@TaoLv @juliusshufan @PatricZhao @eric-haibin-lin
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