*   Moving the checkpoint reader from `swig` to `pybind11`.
    *   `tf.device` & `MirroredStrategy` now supports passing in a
        `tf.config.LogicalDevice`
    *   If you're building Tensorflow from source, consider using
        [bazelisk](https://github.com/bazelbuild/bazelisk) to automatically
        download and use the correct Bazel version. Bazelisk reads the