code: def test_epochs(self):
      buffer = ShuffleBuffer([1, 2, 3, 4], seed=0, epochs=2)
      output = [
          convert_data_type(x, np.ndarray)[0]
          for x in DataLoader(dataset=buffer, batch_size=2)
      ]
      np.testing.assert_allclose(
          output, [[2, 1], [3, 4], [4, 2], [3, 1]]
      )
  
file_path: MONAI/tests/test_shuffle_buffer.py
imports: from __future__ import annotations
  import sys
  import unittest
  import numpy
  from monai.data import DataLoader, ShuffleBuffer
  from monai.utils import convert_data_type
  from tests.utils import SkipIfBeforePyTorchVersion
label_desc: Use image node_id 2 for calling the TestShuffleBuffer obj's underlying member method code with example usage: obj.test_epochs() without return types