code: def oenv(ysr, hop):
      y, sr = ysr
      return librosa.onset.onset_strength(y=y, sr=sr, hop_length=hop)
  
imports: import os
  import pytest
  from contextlib import nullcontext
  import numpy
  import scipy.stats
  import librosa
  from test_core import files, load
label_desc: Use image node_id 8 for calling a global function with example usage: oenv(ysr, hop) and returns: librosa