code: def _maybe_on_device(var):
      # Add a device scope for packed variables.
      if isinstance(var, packed.PackedVarAndDevice):
          with ops.device(var.device):
              yield
      else:
          yield
  
imports: import contextlib
  from tensorflow.python.distribute import packed_distributed_variable
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import resource_variable_ops
  from tensorflow.python.tpu import tpu_replication
label_desc: Use image node_id 5 for calling a global function with example usage: _maybe_on_device(var) without return types