code: def train_input_fn(self):
      return self.params["batch_size"]
  
file_path: euler/euler_estimator/python/node_estimator.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import tensorflow
  import tf_euler
  from euler_estimator.python.base_estimator import BaseEstimator
label_desc: Use image node_id 3 for calling the NodeEstimator obj's underlying member method code with example usage: obj.train_input_fn() and returns: self