code: def test_get_lr_scheduler_no_reduce():
      scheduler_class, scheduler_kwargs = lr_scheduler.get_lr_scheduler(
          scheduler_type="plateau-reduce",
          base_learning_rate=1,
          learning_rate_reduce_factor=1.0,
          learning_rate_reduce_num_not_improved=16,
      )
      assert scheduler_class is None
      assert scheduler_kwargs == {}
  
imports: import pytest
  import numpy
  import torch
  from sockeye import lr_scheduler
label_desc: Use image node_id 4 for calling a global function with example usage: test_get_lr_scheduler_no_reduce() without return types