code: def y_chirp():
      sr = 22050
      y = librosa.chirp(
          fmin=55, fmax=55 * 2**3, length=sr // 8, sr=sr
      )
      return y
  
imports: from __future__ import division
  import warnings
  import os
  from typing import Optional
  import librosa
  import numpy
  import scipy.stats
  import pytest
  from test_core import srand
label_desc: Use image node_id 30 for calling a global function with example usage: y_chirp() and returns: y