code: def _get_internal_buffer(
      buffer: Union[SegmentationBuffer, MultiAgentSegmentationBuffer],
      policy_id: PolicyID = DEFAULT_POLICY_ID,
  ) -> List[SampleBatch]:
      """Get the internal buffer list from the buffer. If MultiAgent then return the
      internal buffer corresponding to the given policy_id.
      """
      if type(buffer) == SegmentationBuffer:
          return buffer._buffer
      elif type(buffer) == MultiAgentSegmentationBuffer:
          return buffer.buffers[policy_id]._buffer
      else:
          raise NotImplementedError
  
imports: import unittest
  from typing import List, Union
  import numpy
  from rllib_dt.dt.segmentation_buffer import MultiAgentSegmentationBuffer, SegmentationBuffer
  import ray
  from ray.rllib.policy.sample_batch import DEFAULT_POLICY_ID, MultiAgentBatch, SampleBatch, concat_samples
  from ray.rllib.utils import test_utils
  from ray.rllib.utils.framework import try_import_tf, try_import_torch
  from ray.rllib.utils.typing import PolicyID
label_desc: Use image node_id 5 for calling a global function with example usage: _get_internal_buffer(buffer, policy_id) and returns: buffer, buffer