code: def butter_lowpass(cutoff, fs=20, order=5):
      nyq = 0.5 * fs
      normal_cutoff = cutoff / nyq
      b, a = signal.butter(
          order, normal_cutoff, btype="low", analog=False
      )
      return b, a
  
imports: import pandas
  import numpy
  import statsmodels.api
  from scipy import signal, integrate
  from pykalman import UnscentedKalmanFilter
  from tsaug import *
  from fbprophet import Prophet
  import pylab
  from seasonal.periodogram import periodogram
label_desc: Use image node_id 13 for calling a global function with example usage: butter_lowpass(cutoff, fs, order) and returns: b,  a