class_docstr: Test the validation module
class_docstr_tok: ["Test","the","validation","module"]
code: def test_packing(self):
      cfg = DictDefault(
          {
              "max_packed_sequence_len": 2048,
          }
      )
      with self._caplog.at_level(logging.WARNING):
          validate_config(cfg)
          assert any(
              "max_packed_sequence_len will be deprecated in favor of sample_packing"
              in record.message
              for record in self._caplog.records
          )
  
      cfg = DictDefault(
          {
              "sample_packing": True,
              "pad_to_sequence_len": None,
          }
      )
      with self._caplog.at_level(logging.WARNING):
          validate_config(cfg)
          assert any(
              "`pad_to_sequence_len: true` is recommended when using sample_packing"
              in record.message
              for record in self._caplog.records
          )
  
      cfg = DictDefault(
          {
              "max_packed_sequence_len": 2048,
              "sample_packing": True,
          }
      )
      regex_exp = r".*set only one of max_packed_sequence_len \(deprecated soon\) or sample_packing.*"
      with pytest.raises(ValueError, match=regex_exp):
          validate_config(cfg)
  
imports: import logging
  import os
  import unittest
  from typing import Optional
  import pytest
  from transformers.utils import is_torch_bf16_gpu_available
  from axolotl.utils.config import validate_config
  from axolotl.utils.dict import DictDefault
  from axolotl.utils.models import check_model_config
  from axolotl.utils.wandb_ import setup_wandb_env_vars
label_desc: Use image node_id 11 for calling the ValidationTest obj's underlying member method code with example usage: obj.test_packing() without return types