code: def normalize_cwt_lf0(f0, mean, std):
      uv, cont_lf0_lpf = get_cont_lf0(f0)
      cont_lf0_norm = (cont_lf0_lpf - mean) / std
      Wavelet_lf0, scales = get_lf0_cwt(cont_lf0_norm)
      Wavelet_lf0_norm, _, _ = norm_scale(Wavelet_lf0)
  
      return Wavelet_lf0_norm
  
file_path: PaddleHub/modules/audio/svs/diffsinger/utils/cwt.py
imports: import librosa
  import numpy
  from pycwt import wavelet
  from scipy.interpolate import interp1d
label_desc: Use image node_id 6 for calling a global function with example usage: normalize_cwt_lf0(f0, mean, std) and returns: Wavelet_lf0_norm