class_docstr: A variable client for updating variables from a remote source.
class_docstr_tok: ["A","variable","client","for","updating","variables","from","a","remote","source","."]
code: def device(self) -> Optional[jax.Device]:
      return self._device
  
file_path: acme/acme/jax/variable_utils.py
imports: from concurrent import futures
  import datetime
  import time
  from typing import List, NamedTuple, Optional, Sequence, Union
  from acme import core
  from acme.jax import networks
  import jax
label_desc: Use image node_id 5 for calling the VariableClient obj's underlying member method code with example usage: obj.device() and returns: self