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Description
This PR makes the SequenceReverse operator use more parallelism in its execution, resulting in significant speedup.
I tested it on the GNMT en-vi example from GluonNLP (https://gluon-nlp.mxnet.io/model_zoo/machine_translation/index.html#google-neural-machine-translation) where it resulted in end to end speed increase from 33k wps to 44-45k wps on a single V100.
FYI @eric-haibin-lin @szha @fhieber @sbodenstein
Checklist
Essentials
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