Saves this cascade into the given HDF5 file.

    **Parameters:**

    ``hdf5`` : :py:class:`bob.io.base.HDF5File`
      An HDF5 file open for writing

def save(self, hdf5):
    """Saves this cascade into the given HDF5 file.

    **Parameters:**

    ``hdf5`` : :py:class:`bob.io.base.HDF5File`
      An HDF5 file open for writing
    """
    # write the cascade to file
    hdf5.set("Thresholds", self.thresholds)
    for i in range(len(self.cascade)):
      hdf5.create_group("Classifier_%d" % (i+1))
      hdf5.cd("Classifier_%d" % (i+1))
      self.cascade[i].save(hdf5)
      hdf5.cd("..")
    hdf5.create_group("FeatureExtractor")
    hdf5.cd("FeatureExtractor")
    self.extractor.save(hdf5)
    hdf5.cd("..")