v1.10.0

NOTE:

• MTF code in Tensor2Tensor has been moved to github.com/tensorflow/mesh - thanks @dustinvtran

New Problems:

• English-Setswana translation problem, thanks @jaderabbit

New layers, models, etc:

• Add Bayesian feedforward layer, thanks @dustinvtran
• Lots of changes to the RL pipeline, thanks @koz4k , @blazejosinski , @piotrmilos , @lukaszkaiser , @konradczechowski
• Lots of work on video mdoels, thanks @mbz , @MechCoder
• Image transformer with local1d and local 2d spatial partitioning, thanks @nikiparmar @vaswani

Usability:

• Support DistributionStrategy in Tensor2Tensor for multi-GPU, thanks @smit-hinsu !
• Pass data_dir to feature_encoders, thanks @stefan-falk
• variable_scope wrapper for avg_checkpoints, thanks @Mehrad0711
• Modalities cleanup, thanks @dustinvtran
• Avoid NaN while adding sinusoidal timing signals, thanks @peakji
• Avoid a ascii codec error in CNN/DailyMail, thanks @shahzeb1
• Allow exporting T2T models as tfhub modules, thanks @cyfra