Update OneBWdsGPipeTransformerWPM with hyperparameters tested on 8 V100s. Add option to support fp16.
Update OneBWdsGPipeTransformerWPM with hyperparameters tested on 8 V100s.
Add option to support fp16.

PiperOrigin-RevId: 252901537

tensorflow/lingvo,tensorflow/lingvo,tensorflow/lingvo,tensorflow/lingvo