code: def test_load_downbeats_from_file(self):
      downbeats = load_beats(
          pj(ANNOTATIONS_PATH, "sample.beats"), downbeats=True
      )
      self.assertTrue(np.allclose(downbeats, 0.0913))
  
imports: from __future__ import absolute_import, division, print_function
  import unittest
  from os.path import join, join
  from madmom.io import *
  from madmom.io import load_beats, load_key, load_notes, load_onsets, load_tempo
  from tests import ANNOTATIONS_PATH, DETECTIONS_PATH
  from .None import DATA_PATH
label_desc: Use image node_id 2 for calling the TestLoadBeatsFunction obj's underlying member method code with example usage: obj.test_load_downbeats_from_file() without return types