constructor arguments. In the future, the symbols
        `tf.keras.optimizers.Optimizer`/`Adam`/etc will point to the new
        optimizers, and the previous generation of optimizers will be moved to
        `tf.keras.optimizers.legacy.Optimizer`/`Adam`/etc.
    *   Added L2 unit normalization layer `tf.keras.layers.UnitNormalization`.

build:rbe_cross_compile_base_xla --strategy=Genrule=standalone

# Due to the above strategy, all Genrule commands are executed locally, but the
# following actions invoke tools (E.g `flatc`, `llvm-tblgen`, etc.) that are
# only executabe on the RBE (x86) machine, so the strategy_regexp options are
# added to override and run the actions using remote strategy.