code: def phase(stft):
      """
      Returns the phase of the complex STFT of a signal.
  
      Parameters
      ----------
      stft : numpy array, shape (num_frames, frame_size)
          The complex STFT of a signal.
  
      Returns
      -------
      phase : numpy array
          Phase of the STFT.
  
      """
      return np.angle(stft)
  
imports: from __future__ import absolute_import, division, print_function
  import warnings
  import numpy
  import scipy.fftpack
  from ..processors import Processor
  from .signal import Signal, FramedSignal
label_desc: Use image node_id 3 for calling a global function with example usage: phase(stft) and returns: np