code: def load_file_scipy_mmap(filename):
      import scipy.io.wavfile
  
      sr, y = scipy.io.wavfile.read(filename, mmap=True)
      # print y.mean(), y.shape
      return len(y), sr
  
file_path: aubio/python/demos/demo_reading_speed.py
imports: import numpy
label_desc: Use image node_id 4 for calling a global function with example usage: load_file_scipy_mmap(filename) and returns: len,  sr