code: def test_length(self) -> None:
      self.assertEqual(len(self.sampler), 10)
      self.assertEqual(len(self.dataloader), 10)
  
file_path: opacus/opacus/tests/poisson_test.py
imports: import unittest
  import numpy
  import torch
  from opacus.utils.uniform_sampler import UniformWithReplacementSampler
label_desc: Use image node_id 3 for calling the PoissonSamplingTest obj's underlying member method code with example usage: obj.test_length() without return types