code: def __call__(self, x):
      return stft(
          x,
          self.n_fft,
          self.n_shift,
          win_length=self.win_length,
          window=self.window,
          center=self.center,
          pad_mode=self.pad_mode,
      )
  
imports: import librosa
  import numpy
label_desc: Use image node_id 3 for calling the Stft obj's underlying member method code with example usage: obj.__call__(x) and returns: stft