code: def hz2mel(hz):
      """Convert a value in Hertz to Mels
  
      :param hz: a value in Hz. This can also be a numpy array, conversion proceeds element-wise.
      :returns: a value in Mels. If an array was passed in, an identical sized array is returned.
      """
      return 2595 * numpy.log10(1 + hz / 700.0)
  
file_path: python_speech_features/python_speech_features/base.py
imports: from __future__ import division
  import numpy
  from python_speech_features import sigproc
  from scipy.fftpack import dct
label_desc: Use image node_id 6 for calling a global function with example usage: hz2mel(hz) and returns: unknown