class_docstr: An `adanet.Builder` from a :class:`tf.estimator.Estimator`.
class_docstr_tok: ["An","`","adanet.Builder","`","from","a",":","class",":","`","tf.estimator.Estimator","`","."]
code: def build_subnetwork_train_op(
      self,
      subnetwork,
      loss,
      var_list,
      labels,
      iteration_step,
      summary,
      previous_ensemble,
  ):
      return subnetwork.shared["train_op"]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import inspect
  from adanet import subnetwork
  from adanet import tf_compat
  import tensorflow.compat.v2
label_desc: Use image node_id 5 for calling the _BuilderFromSubestimator obj's underlying member method code with example usage: obj.build_subnetwork_train_op(subnetwork, loss, var_list, labels, iteration_step, summary, previous_ensemble) and returns: subnetwork