v2.7.2
Internal change
Add a reference for annealing task sampler.
#KerasNLP Update TransformerEncoderBlock to support Q, KV as two input streams.
With float16, always use LossScaleOptimizer.
Change activation/add/upsampling/identity to a keras layer form for the spinenet_mobile. Added use_keras_upsampling_2d flags to use keras upsampling layer instead of optimized custom spatial_transform_ops.