code: def buffer():
      return SingleEpisodeBuffer()
  
file_path: coach/rl_coach/tests/memories/test_single_episode_buffer.py
imports: import os
  import sys
  import pytest
  import numpy
  from rl_coach.core_types import Transition
  from rl_coach.memories.episodic.single_episode_buffer import SingleEpisodeBuffer
label_desc: Use image node_id 1 for calling a global function with example usage: buffer() and returns: SingleEpisodeBuffer