class_docstr: Test the DDPOTrainer class.
class_docstr_tok: ["Test","the","DDPOTrainer","class","."]
code: def test_generate_samples(self):
      samples, output_pairs = self.trainer._generate_samples(1, 2)
      self.assertEqual(len(samples), 1)
      self.assertEqual(len(output_pairs), 1)
      self.assertEqual(len(output_pairs[0][0]), 2)
  
file_path: trl/tests/test_ddpo_trainer.py
imports: import gc
  import unittest
  import torch
  from trl import is_diffusers_available, is_peft_available
  from .testing_utils import require_diffusers
label_desc: Use image node_id 4 for calling the DDPOTrainerTester obj's underlying member method code with example usage: obj.test_generate_samples() without return types