message: ["Variable", "VariableV2", "VarHandleOp"] is the default for ps_ops=None
diff: @@ -168,7 +168,8 @@ def replica_device_setter(ps_tasks=0, ps_device="/job:ps",
  than overriding them.
  cluster: `ClusterDef` proto or `ClusterSpec`.
  ps_ops: List of strings representing `Operation` types that need to be
  - placed on `ps` devices. If `None`, defaults to `["Variable"]`.
  + placed on `ps` devices. If `None`, defaults to
  + `["Variable", "VariableV2", "VarHandleOp"]`.
  ps_strategy: A callable invoked for every ps `Operation` (i.e. matched by
  `ps_ops`), that takes the `Operation` and returns the ps task index to
  use. If `None`, defaults to a round-robin strategy across all `ps`
  