The internal target setting configurations had a bug where the variants all used post-layernorm.
We reran the target setting procedure with corrected configurations.
These updated targets are the minimum BLEU score values of:

1. the previously checked in targets
2. the targets as determined by the full target setting procedure on internal experiments with corrected configs.
3. the best eval metrics achieved with the GitHub code with the updated hparam point from the target setting procedure.

These updates result in slightly easier targets than previously checked in tarets.