func ShardKeyFromRegistry(instance shardRegistry) ShardKey {
	return ShardKey{Cluster: instance.Cluster(), Provider: instance.Provider()}
}

// ShardKey is the key for EndpointShards made of a key with the format "provider/cluster"
type ShardKey struct {
	Cluster  cluster.ID
	Provider provider.ID
}

func (sk ShardKey) String() string {
	return string(sk.Provider) + "/" + string(sk.Cluster) // format: %s/%s

* `tf.constant_initializer`
    * It now takes a new argument called `support_partition`. If True, constant_initializers can create sharded variables. This is disabled by default, similar to existing behavior.

* `tf.lite`
    * Added support for `stablehlo.scatter`.

* `tf.estimator`

  let summary = [{
V2 format specific: merges the metadata files of sharded checkpoints.  The
  }];

  let description = [{
result is one logical checkpoint, with one physical metadata file and renamed
data files.

Intended for "grouping" multiple checkpoints in a sharded checkpoint setup.

If delete_old_dirs is true, attempts to delete recursively the dirname of each