code: def train_input_fn(self):
      raise NotImplementedError
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import json
  import numpy
  import tensorflow
  import tf_euler
label_desc: Use image node_id 14 for calling the BaseEstimator obj's underlying member method code with example usage: obj.train_input_fn() without return types