code: def test_betas(self):
      for beta_start, beta_end in zip(
          [0.0001, 0.001, 0.01, 0.1], [0.002, 0.02, 0.2, 2]
      ):
          self.check_over_configs(
              beta_start=beta_start, beta_end=beta_end
          )
  
imports: import torch
  from diffusers import DDPMScheduler
  from .test_schedulers import SchedulerCommonTest
label_desc: Use image node_id 3 for calling the DDPMSchedulerTest obj's underlying member method code with example usage: obj.test_betas() without return types