docstr: Compute the mel-spectrogram of a signal
code: def melspectrogram(self, signal):
      """Compute the mel-spectrogram of a signal"""
  
      algo = TensorflowInputFSDSINet()
      frames = [
          algo(frame)
          for frame in FrameGenerator(
              signal,
              frameSize=self.frame_size,
              hopSize=self.hop_size,
          )
      ]
  
      return numpy.array(frames)
  
file_path: essentia/test/src/unittests/spectral/test_tensorflowinputfsdsinet.py
imports: from essentia_test import *
label_desc: Use image node_id 1 for calling the TestTensorflowInputFSDSINet obj's underlying member method code with example usage: obj.melspectrogram(signal) and returns: numpy