code: def restore(self):
      self.value.load_state_dict(self._saved_optimizer_state)
  
imports: import copy
  import torch
  from horovod.common.elastic import ObjectState
  from horovod.torch.elastic.sampler import ElasticSampler
  from horovod.torch.functions import allgather_object, broadcast_object, broadcast_optimizer_state, broadcast_parameters
  from horovod.torch.mpi_ops import rank
label_desc: Use image node_id 3 for calling the OptimizerStateHandler obj's underlying member method code with example usage: obj.restore() without return types