code: def is_ready(self):
      mod_to_train = self.__check_modalities_to_train()
      return False if mod_to_train else True
  
file_path: NiftyNet/niftynet/layer/histogram_normalisation.py
imports: from __future__ import absolute_import, print_function, division
  import os
  import numpy
  import tensorflow
  import niftynet.utilities.histogram_standardisation
  from niftynet.layer.base_layer import DataDependentLayer
  from niftynet.layer.binary_masking import BinaryMaskingLayer
label_desc: Use image node_id 4 for calling the HistogramNormalisationLayer obj's underlying member method code with example usage: obj.is_ready() and returns: unknown