code: def assign_sub_on_device(device, variable, tensor):
      with ops.device(device):
          return variable.assign_sub(tensor)
  
imports: from tensorflow.python.distribute import distribute_lib
  from tensorflow.python.distribute import reduce_util
  from tensorflow.python.eager import context
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_util
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variable_scope
  from tensorflow.python.saved_model import save_context
  from tensorflow.python.saved_model import save_options
  from tensorflow.python.training.saving import saveable_object
label_desc: Use image node_id 24 for calling a global function with example usage: assign_sub_on_device(device, variable, tensor) and returns: variable